PLATE 17

 FIGURE 1-3. T7enostoa (Pseudorotella) semoonium Woodring, n. sp. (p. 71).
 Type. Height 1 mm, diameter 1.5 mm. Locality 138a. Lower part of Gatun formation, middle Miocene. USNM 561432.
 4-6. Teinostoma (Idioraphe) angulatum trochalum Woodring, n. subsp. (p. 70).
 Type. Height 1 mm, diameter (incomplete) 1.7 mm. Locality 137. Lower part of Gatun formation, middle Miocene. USNM 561431.
 7-15. Cyclosremiscus (Ponocyclus) pentagonus (Gabb) (p. 73).
 Middle part of Gatun formation, middle Miocene. 7-9. Bicarinate specimen. Height 1 mm, diameter 1.6 mm. Locality 1476. USNM 561320. 10-12. Tricarinate specimen. Height 1 mm, diameter 1.8 mm. Locality 1476. USNM 561320. 13-15. Exceptionally large specimen. Height 1.1 mm, diameter 2.3 mm. Locality 155c. USNM 561321. 16-18. Solariorbis (Hapalorbis) hyptius hyptius Woodring, n. sp. and n. subsp. (p. 75).
 Type. Height 0.7 mm, diameter 1.4 mm. Locality 1476. Middle part of Gatun formation, middle Miocene.
 USNM 561323.
19-24, 31-33, 37-39. Teinostooa (Idioraphe) spermatia Woodring, n. sp. (p. 69).
 Locality 147b. Middle part of Gatun formation, middle Miocene. 19-21. Sculptured specimen. Height 0.8 mm, diameter 1.6 mm. USNM 561313. 22-24. Small specimen. Height 0.6 mm, diameter 1.2 mm. USNM 561313. 31-33. Large form. Height 1.1 mm, diameter 2.6 mm. USNM 561313. 37-39. Type. Height 0.7 mm, diameter 1.8 mm. USNM 561312. 25-27. Teinostomea (Pseudorotella) pycnum (Woodring). (p. 71).
 Height 0.8 mm, diameter 1.3 mm. Locality 147b. Middle part of Gatul formation, middle Miocene. USNM 561317.
 28-30. Teinostoea (Diaerecallus) sychnum Woodring, n. sp. (p. 72).
 Type. Height 1.1 smm, diameter 1.7 mm. Locality 1475. Middle part of Gatun formation, middle Miocene.
 USNM 561316.
 34-36. Solariorbis (Hapalorbis) hyptius anebus Woodring, n. subsp. (p. 75).
 Type. Height 0.9 mm, diameter 1.5 mm. Locality 185. Upper part of Gatun formation, western area, late Miocene. USNM 561324.
 40-42. Teinostoina (Aepystoea) andrium Woodring, n. sp. (p. 70).
 Height 1.2 mn, diameter 2.1 nm. Locality 137. Lower part of Gatun formation, middle Miocene. USNM 561314.
 43-45. Solariorbis (Solariorbis) slronylus Woodring, n. sp. (p. 75).
 Type. Height 1.3 mmin, diaeter 2.4 nm. Locality 138. Lower part of Gatun formation, middle Miocene.
 ITSNMI 561322.
 46. Teclonalica agna Woodring, n. sp. (p. 88).
 Type. Height 2.8 semm, diameter 2.4 mmna. Locality 147b. Middle part of Gatun formation, middle Miocene. tTSNM 561348.
 47. Tricolia? synto,,a Woodring, n. sp. (p. 66).
 Type. Height 2.2 mm, diameter 2.2 nun. Locality 170a. Middle part of Gatun formation, middle Miocene.
 USNM 561328.