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BULLETIN FLORIDA MUSEUM NATURAL HISTORY VOL. 46(3)
the base of the epiphallus, by having a short and stout epiphallus, by having an abbreviate genital atrium, by having a long middle vagina that widely separates the dart-sacs from the dart-glands, and by a short spermathecal duct that is less than the length of the uterus-prostate. The flagellum is short and stout compared to species from the Sierra de La Catarina.
Like Humboldtiana from the Sierra de La Catarina these snails bear fine transverse striations on the embryonic whorls, but the striations are coarser, though nearly obsolete, and the are not as wavy. The embryonic sculpture is most easily viewed in zones of reflected light.
Humboldtiana titania n. sp.
Diagnosis. The moderately large shell is depressed-globose in shape, and consists of 4.1 -4.5 whorls. The embryonic whorls bear relatively coarse wavy transverse micro-striation. The postembryonic whorls are almost lusterless with rather coarse incremental striations and growth wrinkles. The first postembryonic whorl bears a few scattered granules that mostly are found along the lower suture. The color is light brown with three bold blackish-brown bands and numerous transverse white streaks on growth wrinkles. The peristome is tinged pink. The interior of the aperture is light brown with a whitish tinge and banded. The reproductive anatomy is distinct because of its stout features, including the penis, epiphallus, flagellum, and spermathecal duct. The epiphallus is very short, being about half the length of the penis. The flagellum is moderately short and is lined internally with four longitudinal columns. There are four dart sacs, of which ds, is the largest; and ds3 and ds4 are vestigial. The dart gland is widely separated from the dart sacs. The spermathecal duct is moderately short with a short caecum nears its distal end.
The head-foot is orange-gray in life, and live animals smell like putrid garlic.
Shell (Figs. 42-45). The shell is large. Mature shells are about 31-39 mm wide, depressed helico-glo-bose in shape, and are about 0.77-0.87 times as high as wide. The whorls are inflated with a deeply impressed suture. The periostracum is smooth but nearly lusterless due to rather strong growth wrinkles. It is light brown in color with three stark blackish-brown bands and numerous transverse white streaks. The bands are sub-equal in size. The lower band usually is the widest, but not always. The interior of aperture is light brown with a whitish tinge, and is banded. The umbilicus is obliquely perforate (Fig. 45). There are 4.1-4.5 whorls; more often 4.3-4.4. The 1.2 embryonic whorls protrude, but
are low. The first embryonic whorl is 4.1 mm wide transverse to the initial suture. The embryonic whorls are sculptured with nearly obsolete transverse wavy wrinkles that are visible mostly in areas of reflected light. The following postembryonic whorls are sculptured with coarse incremental striations and growth wrinkles. The first postembryonic whorl has occasional elongate granules aligned with the growth wrinkles mostly along the lower suture. Granular sculpture is absent on the subsequent whorls. The last whorl strongly descending to the aperture. The upper lip inserts on or just below the sub-peripheral band. The aperture is oblique in lateral profile, lying at an angle of about 34-42 to shell axis (Fig. 43). The aperture is oblong and is 0.77-0.87 times as wide as high. The peristome is slightly reflected along the upper, outer and basal lips; and nearly covers the umbilicus along the columellar margin.
Measurements of the holotype and 14 paratypes are given in Table 6.
Anatomy. In life the head-foot is orange-gray in color. The color of the mantle is light orange in preservatives. Live snails emitted a strong putrid garlic-like odor.
Reproductive system (Figs, 50-51). The genital atrium is moderately short. The penis is elongate but stout and vase-shaped. The penis wall is thin. The interior of the penis bears a fleshy collar near the middle of the laterad wall with 4 longitudinal folds extending to the atrium. The penis has a large convoluted verge that is about half the length of the penis chamber (Fig. 51). The penis retractor muscle is very short and stout. It is slightly less than the length of the penis. The penis retractor originates slightly behind the mantle collar on the center of nape, and inserts on the epiphallus where it forms a narrow sheath around the lower third of the epiphallus. The epiphallus is very stout and short. It is slightly more than half the length of the penis. Its interior is lined with four fleshy columns. The flagellum is very stout and abruptly tapers at the end. It is short, being slightly longer than the combined length of penis + epiphallus. The interior of the flagellum has four longitudinal fleshy columns. The lower vagina is elongate and tapers narrowly to the atrium. There are four dart-sacs, of which ds, is the largest, ds2 is the second largest, ds, and ds4 are very much reduced in size. The dart-gland are widely separated on the middle vagina from the dart-sacs by a distance about equal to half of the length of the lower vagina. The free vagina is not apparent. The spermathecal duct is stout and is relatively short, being less than the length of the uterus. The spermathecal duct bears a short caecum that is slightly less than the length of the duct + spermatheca above its origin.