GASTROPODS: TROCHIDAE TO TURRITELLIDAE


the Yellow Limestone of Jamaica (Trechmann, 1923, p. 347, pl. 15, figs. 1-3). A similar, if not identical, form (Trechmann, 1929, p. 490, pl. 18, figs. 19a, b) and an unidentified species (Trechmann, 1924, p. 10, pl. 1, 11g. 7) have been found in other Eocene strata of that island. Fossils from California have been referred to V. perversus (Vokes, 1935, p. 382, pl. 25, figs. 1, 3, 5, pl. 26, fig. 1) and to a species of doubtful validity, V. californicus Vokes (1935, p. 384, pl. 26, figs. 3-8. A Florida locality yielded a large Velates, possibly a large Torm of V. perversus, described as V. floridanus Richards (1946; Richards and Palmer, 1953, p. 13, pl. 1, figs. 6-9). V. vokesi Cooke (1946; 1919, p. 126, pl. 5, figs. 7, 8), from the middle Eocene of the island of St. Bartholomew, is represented by poorly preserved specimens, none of which shows the aperture. The apex of V. vokesi is almost marginal, like that of V. .noetlingi Cossmann and Pissarro (Cox, 1931, p. 37). The groove on the large specimen of V. vokesi figured by Cooke and also on the small figured specimen, which is the type, evidently marks the boundary between the area where growth takes place by addition 'to the outer lip and the area where growth is the result of resorption of the callus. The boundary between these two areas on the opposite side of the shell is not apparent. A species of Velates, similar in outline to V. vokesi, is found in limestone of middle(?) Eocene age in the Sierra de Bahoruco of the Dominican Republic, and in deposits of probable middle Eocene age in Chiriqui Province, Panami and Baja California.
 The remarkable architecture of Velates was described many years ago by Woodward (1892).
 Occurrence: Gatuncillo formation (middle and late Eocene), Madden basin, localities 6, 7, 9, 15; Rio Casaya area, locality 38.
 Genus Neritina Lamarck
Lamarck, Encyclop6die m6thodique, Histoire naturelle des vers,
 v. 3, pl. 455; Liste, p. 11, 1816.
Type (logotype, Children, Lamarck's Genera of shells, p. 111,
 1823): Neritina pulligera (Nerita pulligera Linn6), Recent,
 rivers of India and Melanesia.
 Opinion 119 of the International Commission on Zoological Nomenclature, issued in 1931, placed Neritina Lamarck, with N. pulligera as the type, in the Official List of Generic Names.
 Subgenus Vitta Mdrch
M6rch, Catalogus conchyliorum * Comes de Yoldi, pt. 1,
 p. 166, 1852.
Type (logotype, Baker, Acad. Nat. Sci. Phila. Proc., v. 75, p.
 137, 1923): Nerita virginea Linn6, Recent, southern Florida
 to northern South America, mainly estuarine.
 The convex callus and color pattern suggest that the following two species may be allied to Neritina virginea. They therefore are doubtfully assigned to the subgenus


Vitta. According to Baker, in the publication just cited, Vitta is estuarine to fresh-water and is found in eastern America and western Africa.
 Neritina (Vitta?) species
 Small, spire worn. Callus thick, moderately convex. Columellar lip finely and weakly denticulate. Color pattern poorly preserved, consisting of dark wavy axial lines.
 Height (practically complete) 7 mm, diameter (incomplete) 6 mm. Height (practically complete) 5 mm, diameter (practically complete) 5 mm.
 This unidentified Neritina is represented by four incomplete specimens from the Culebra formation at locality 108c. The columellar lip is exposed on only one of them. The smallest has traces of dark axial lines and another shows such lines on a remnant of the outer calcite shell layer adjoining the edge of the callus. This Culebra species, like the following Gatun species, may be allied to the Recent Caribbean Neritina virginea (Linn6). It has a thicker callus than small specimens of that Recent species.
 Occurrence: Culebra formation (early Miocene), Gaillard Cut, locality 108c.
 Neritina (Vitta?) cf. N. virginea (Linn6) Plate 21, figures 1, 2
 Small, spire corroded. Callus moderately thick, strongly convex. Columellar lip finely and weakly denticulate. Color pattern consisting of closely spaced minutely zigzag dark axial lines, wider at forward apex of V's (apex toward outer lip). Near outer lip and also near callus the widened apices disintegrate into isolated triangles. On later half of body whorl a solid relatively wide dark spiral band adjoins suture.
 Height (incomplete, spire corroded) 3.6 mm, diameter
 3.6 mm (figured specimen).
 Two small shells, collected from the middle part of the Gatun formation at two localities in the western area, are referred to Neritina cf. N. virginea (Linn6).
-The color pattern is well preserved on the figured specimen. On the other, slightly larger, specimen only small patches of the outer calcite layer, and therefore of the color lines, remain. The lines evidently are not as closely spaced as on the figured specimen.
 The convex callus and color pattern suggest relationship to the Caribbean Recent N. virginea, which reaches a much larger size. The most common color pattern of N. virginea consists of wavy dark lines interrupted by dark-bordered ovoid or triangular lightcolored eyes. The eyes are absent on some specimens and in some subspecies, but on Recent shells that lack eyes the lines are not as strongly zigzagged as on the figured fossil from Panam6. A specimen collected at


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