PLATE 18

FIGURE 1-3. Anticlimax (Subclimoax) teleospira hystata Woodring, n. subsp. (p. 73).
 Type. Height, 1.5 mm, diameter (incomplete) 2.7 mm. Locality 185. Upper part of Gatun formation.
 western area, late Miocene. USNM 561319.
 4, 8. Episcynia megalia Woodring, n. sp. (p. 76).
 Type. Height 2.7 mm, diameter 5.3 mm. Locality 138. Lower part of Gatun formation, middle Sliocene.
 USNM 561325.
 5-7. Anticlimax (Aniclimax) gatunensis Pilsbry and Olsson (p. 72)
 Topotype. Height 1.7 mm, diameter (incomplete) 3 nmm. Locality 138. Lower part of Gattn formation,
 middle Miocene. USNM 561318
 9-11. Teinostoma (Aepystoma) andrium Woodring, n. sp. (p. 70).
 Type. Height 2 mm, diameter 4.7 nun. Locality 137. Lower part of Gatun formation, middle Miocene.
 USNM 561315.
 12-14. Calliostoma (Calliostoroa) 7tetaliam Woodring, n. sp. (p. 63).
 Type. Height (almost complete, but crushed) 19.5 amm, diameter (incomplete) 24 mm. Locality 206a.
 Chagres sandstone, early Pliocene. USNMI 561430.
 15, 16. Neverita (Hypterita) helicoides (Gray) (p. 92).
 Height (incomplete) 16 min, diameter (incomplete) 34 tmmt. Locality 155b. Middle part of Gatun formation, middle Miocene. USNAI 561356.