EXPLANATION OF PLATES. 345 



PLATE 48. 



22. Acanthopleura spiniger Sowb. Charlesworth's Mag. Nat. 



Hist., . . . , . . . . 221 



23. Acanthopleura spiniger Sowb. Conch. Illustr., . . 221 

 24-26. Acanthopleura spiniger Sowb. (Interior, and posterior 



valve). Pilsbry del., .221 



27. Acanthopleura spiniger Sowb. Conch. Icon., . . 221 



28. Acanthopleura spiniger var. granata Rv. Pilsbry del., 224, 



[225 



29. 30. Acanthopleura spiniger var. granata Rv. Conch. 



Icon., 224,225 



31. Acanthopleura spiniger var. (Viti Is.) Ross del., . . 223 



32. Acanthopleura spiniger var. (Viti Is.). Pilsbry del., . 223 



PLATE 49. 



33,34. Acanthopleura spiniger var. cunninghami Rve. Conch. 



Icon., 225 



35, 36. Chiton linter (Chemn.) Rve. Conch. Icon., (See 



appendix.) 

 37, 38. Chiton piceus Rv. not Linn. (=A. spiniger var. obesa 



Shuttl.) 226 



PLATE 50. 



39. Acanthopleura granulata Gmel. (St. Thomas). Ross del., 227 



40, 41. Acanthopleura granulata Gmel. (group of white and 



of dark spines). Pilsbry del., . . 227 



42. Acanthopleura granulata Gmel. (occidentalis Reeve). 



Conch. Icon., 227 



43. Acanthopleura granulata (Key Vaccas, Fla.). Ross del., 227 

 44-47. Acanthopleura granulata Gmel. (St. Domingo). 



Pilsbry del., 227 



48. Acanthopleura granulata Gmel. (St. Thomas). Ross del., 227 



49. Acanthopleura granulata Gmel. Emerton del., . . 227 



PLATE 51. 



1. Schizochiton incisus Sowb. 235 



2. Schizochiton incisus Sowb. (half of head valve). Q. J. 



M. S., 235 



3. Schizochiton incisus Sowb. (eye, x 200). Q. J. M. S., . 235 

 4-5. Schizochiton incisus Sowb. (valves i and ii). Emerton 



del., . . . 235 



6-8. Schizochiton incisus Sowb. (valve viii, ventral, profile 



and posterior views). Emerton del., .... 235 

 9-12. Lorica angasi Ad. & Ang. Emerton del., . . . 238 



