PLATE XX. 



Fig. 1. Cerithiopsis Sigsbeeana DsiW ; 10.5. Page 254. 



** 2. Cerithiopsis Martensii Dall ; 11.25. Page 255. 



*' 3. Cerithiopsis crijstalli?i(i Ball ; IQ.O. Poor figure. Page 254. 



" 4. Cerithiopsis {Eitmeta ?) subulata M.ontagu ; 14:.25. Page 252. 



" 5. Cerithiopsis abrupta Watsou ; 4.3. Page 257. 



" 5 a. Triforis triserialis Dall ; 8.25. Page 246. 



" 6. Tri/oris cyli7idrella Ball; 6.5. Page 250. 



*• 6 a. Triforis triserialis Dall ; 15.5. Page 246. 



*' 7. Mathilda yucatecana Dall ; 8.0. Page 266. 



" 8. Triforis triserialis var. intermedia Dall ; 11.0. Page 247. 



" 9. Triforis abrupta DaH; 7.5. Page 249. 



" 10. Triforis longissima Dall ; 26.0. Page 246. 



*' 11. Triforis bigemma var. hircus Dall ; 12.5. Page 249. 



" 11 b. Triforis torticula Dall ; 10.5. Page 249. 



'* 12. Triforis colon Dall ; 12.0. Page 247. 



♦* 12 b. Triforis inflata Watson var. ibex Dall ; 11.0. Page 249. 



