PLATE 19

FIGURE 1-3. Crepidula plana Say (p. 79).
 Locality 138. Lower part of Gatun formation. USNM 561334.
 1. Length 17.5 mm, width 10.6 mm, height 4 mm.
 2, 3. Length 15 mm, width 10.5 mm, height 2 mmr.
 4, 5. Crepidula ef. C. roaculosa Conrad (p. 79).
 Length 28.5 ram, width 17.5 mm, approximate height 10.5 amm. Locality 155c. Middle part of Gatun formation.
 USNM 561333.
 6, 7. Crucibulum (Crucibuluma) chipolanur Dall (p. 82).
 Height 16.5 mm, maxiimum diameter 27 mm. Locality 155b. Middle part of Gatun formation. USNM 561336.
 8-10. Crucibulur (Dispolaea) springvaleense Rutsch (p. 83).
 Height 11 mm, maxiarurrm diameter 19.2 mm. Locality 155a. Middle part of Gatun formation. USNM 561337.
 11-14. Trochita trochiforeris (Born) (p. 81).
 Lower part of Gatun formation.
 11, 12. Height (incomplete) 10.7 mmr, maximum diameter 28.8 mrr. Locality 136. USNM 561335.
 13, 14. Height (almost complete) 27 mia, maximum diameter 43.5 mm. Locality 136a. Stanford Univ. paleont.
 coll. 8072.