PLATE X. 



Figures 1, 2, and 11. Caudina arenata (Gould). (From Gerould, 1896.) 



Figure 1. Adult, laid open to show internal organs. Natural si/<;. 

 2. Anterior end, showing tentacles and digits. X 5. 



11. Calcareous table from skin. X 280. 



Figures 3-7. Aphelodactyla molpadioides (Semper). (From Semper, 1868.) 



Figure 3. Calcareous ring. Enlarged ( ?) 



4. Rosettes. X 260. 



5. Buttons. X 260. 



6. Calcareous particles from wall of cloaca. X 260 ( ?). 



7. Calcareous particles from wall of stomach. X 260. 



Figures 8 and 9. Molpadia tridens (Sluiter). (From Sluiter, 1901.) 



Figure 8. Anchor. X 260 ( ?) 



9. Anchor-plate ("rosette"). X 260 (?) 



Figure 10. Cuvier's organs of Caudina chilensis (Miiller). X 50 (?) (From Miiller, 1851.) 



12. Calcareous table of Caudina albicans (Theel). X 280. (From Gerould, 1896.) 



13. Calcareous plate of Caudina calif ornica (Ludwig.) X 230. (From Ludwig, 1894.) 



14. Calcareous tables of Molpadia oolitica (Pourtales). X 130. (From Dan. and 



Kor., 1882.) 



15. Tables of Molpadia andamanensis (Walsh). X 150. (From Koehler and Vaney, 



1905.) a. Table of body, seen from above. b. Same, seen from side. c. 

 Table from caudal region. 



16. Tables of Molpadia similis (Theel). X 160 ( ?) (From Theel, 1886a,) 



Figures 17 and 18. Molpadia maroccana (R. Perricr). X 70. 

 (From R. Perrier, 1903.) 



Figure 17. Table with numerous holes in disc. 

 18. Large perforated plate. 



Figure 19. Rod from tail of Molpadia perforata (Sluiter). X 175 (?) (From Sluiter, 

 1901.) 



Figures 20 and 21. Molpadia granulata (Ludwig). X 115. (From Ludwig, 1894.) 



Figure 20. Table from caudal region, a. Disc. b. Spire. 

 21. Table from body. a. Disc. b. Spire. 



Figure 22. Table of Molpadia dispar (Sluiter). X 130 ( ?) (From Sluiter, 1901.) 



23. Anchor-plate of Molpadia marenzcllcri (Theel). X 160 (?) (From Theel, 



1886a.) 



24. Characteristic 3-armed table (from above) of Molpadia brevicaudata (Koehler and 



Vaney). X 150. (From Koehler and Vaney, 1905.) 



25. Anchor-arms of Molpadia polymorplia (Koehler and Vaney). X 150. (From 



Koehler and Vaney, 1905.) 



220 



