PLATE 16
FIGURE 1, 2. Littorina aff. L. angulifera (Lamarck) (p. 68).
 Height (practically complete) 12 mm, diameter 8.5 mm. Locality 110. Uppermost part of Culebra formation.
 USNM 561331.
 3. Turritella ef. T. subgrundifera Dall (p. 105).
 Height (incomplete, 3 whorls) 18 mm, diameter 5 mm. Locality 99d. Culebra formation. USNM 561384.
 4--7, 10. Turritella (Torcula?) amaras Woodring, n. sp. (p. 101).
 Culebra formation.
 4. Height (incomplete, 5 whorls), 23.5 mm, diameter 10 mm. Locality 107. USNM 561374.
 5. Height (incomplete, 7 whorls) 8 mm, diameter 2.7 miom. Locality 99b. USNM 561377.
 6. Height (incomplete, 3+ whorls) 43 min, diameter 24.5 mm. Locality 98. USNMI 561376.
 7. Type. Height (incomplete) 47 mm, diameter 14.5 mm. Locality 116. USNMI 561373.
 10. Height (incomplete, 4+ whorls) 30 mm, diameter 18 mn. Locality 112. USNMT 561375.
 8, 9. Turritella venezuelana Hodson (p. 106).
 Culebra formation.
 8. Height (incomplete, 2 whorls) 6.8 mm, diameter 6 mm. Locality 110. USNM 561386.
 9. Height (incomplete, 6 whorls) 15.3 mm, diameter 5.4 mm. Locality 112a. USNM 561385.
 11. Pachycrommium? cf. P.? trinitatensis (Mansfield) (p. 97).
 Height (incomplete) 50 mm, diameter (exaggerated by crushing) 39 mm. Locality 99h. Culebra fornstions.
 USNM 561365.
 12. Pachycrsommiui? cf. P. guppyi (Gabb) (p. 97).
 Height (not quite complete) 27 mm, diameter 21.5 mom. Locality 115a. Culebra formation. USNM 561366.
 13. Turritella cf. T. collazica Maury (p. 08).
 Height (incomplete, 4+ whorls) 56 mim, diameter (exaggerated by crushing) 25 mis. Locality 123. La Boca
 marine member of Panamnd formation. USNMI 561368.