346 EXPLANATION OF PLATES, XVII. 



FIGURE FACE 



14, 15. Pyrgopolon clava Lam. From Chenu, . . . 245 



16. Ditriipa subulata Dli. From Deshayes, .... 241 



17. Ditriipa goreensis Cless. From Conch. Cab., . . . 241 



18. Spirodentalium oceola Walcott. From P. U. S. N. M., . 246 



19. Ditrupa arietina Miill., much enlarged. From Chall. Rep., 241 



20. Ditrupa (?) abhreviata Dh. From Deshayes, . . .242 



Plate 38 {Deutalhan vulgare). 



1, 2. Ventral and lateral views of animal with the shell re- 

 moved, ......... vi 



3. Section of the shell, ........ vi 



4. Gut, viewed ventrally, ....... vi 



5. Alimentary tract, dorsal view, ...... vi 



6. One of the captacula, much enlarged, . . . . vi 



7. Animal in feeding position, ...... vi 



(All figures of this plate from Lacaze-Duthiers). 



Plate 39. 



1, 2, 3. Dentalinm bednalli P. & S. Pilsbry, del., . . 248 



4. Cadulus anguidens INI. & S. J. ofC, ix, .... 253 



5. Dentalium multistriaium Dh. From Deshayes, . . 251 



5. Dentalium rectius Cpr., teeth. Pilsbry, del., . . . vii 



6. Dentalium occidentale Stimps. Teeth. From Sars, . vii 

 7,8,9. Siphonodentaliuni lobatum Sowb. Teeth. From Sars. vii 



10. Entaliua quinquangularis Fbs. Teeth. From Sars, . vii 



11. Cadulus propinquus Sars, teeth. From Sars, . . . vii 



12. Dentalium (Lobantale) duplex Defr. Fi'om Deshayes, xxxi 



Plate 40 (Ch(etoderma). 



1-4. C. nitidulum, nat. size; fig. 5, head end, enlarged; fig. 

 7, oral shield from in front ; fig. 8, posterior end from 

 above; fig. 9, the same from the side ; fig. 10, diagram- 

 matic section of radula in its sack and tongue; fig. 11, 

 the tooth ; figs. 13-15. spicules, those on the left from the 

 arterior, on the right from the middle and posterior parts 

 of the body. After Wiren and others, .... 287 

 12, 16, 17. Chfetoderma militare, spicules ; fig. 18, animal, nat- 

 ural size. After Selenka, ...... 288 



Plate 41 (After Wiren). 



16. Chretoderma productum, head ; figs. 17-19, Animal, natu- 

 ral size ; figs. 20-24, spicules ; fig. 25, fig. 2(), caudal 

 sense organ, ........ 



27. Track of Cli. nitidulum. From Wiren, .... 285 



28. P)urr()\ving of Ch. nitidulum. From Wirt'ii, . . . 285 



286 



