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. Acauthopleura 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 Grael. (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 



