CONTENTS, Xlll 



PAGE 



Fam. IX. Phyllirhoidoe. — Phyllirhoe 338 



Fam. X. Elysiadce. — Elysia, Acteonia, Cenia, Limapontia, 

 Rhodope 339 



Order IY. Nugleobranchiata 340 



Fam. I. Firolidce. — Firola, Carinaria, Cardiapoda 342 



Fam. II. Atlantidce. Atlanta, PorceUia, BeUerophon, Cyr- 

 tolites, Maclurea 343 



Class III. Pteropoda 346 



Section A. Thegosomata 348 



Fam. I. HyaleidcE. — Hyalea, Cleodora, CuAderia, Theca, 



Pterotheca, Conularia, Enrybia, CjTn'bulia, Tiedemannia . . 348 

 Fam. II. Limaclnid(B. — Limacina, Spirialis, Cheletropis, Mac- 

 giUivrayia 351 



Segtiox B. Gymnosomata 353 



Fam. III. Cliidce. — Clio, Pneumodermon, Pelagia, Cymo- 

 docea 353 



CHAPTER III. 



Class IV. Braghiopoda , 354 



Fam. I. TerehratuUdce. — Terebratula, Terebratella, Argiope, 

 Thecidimn, Stringoceplialus 363 



Fam. II. Spiriferidce. — Spirifera, Atbyris, Retzia, Uncites. . 371 

 Fam, III. Ehyncho7iellid(c. — Rhynchonella, Pentamerus, 

 Atrypa 375 



Fam. rV. Orthidce. — Orthis, Strophomena, Davidsonia, Cal- 



ceola 379 



Fam. V. ProductidcB. — Productiis, Strophalosia, Cbonetes .. 383 



Fam. VI. CraniadcB. — Crania 386 



Fam. YU. Discinida. — Discina, Siphonotreta 388 



Fam. VIII. LingulidcB. — Lingula, Obolus 390 



CHAPTER IV. 



Class V. Coxchifera 393 



Section A. Asiphonida 406 



Fam. I. OstreidcB. — Ostrea, Anomia, Placuna, Pecten, Lima, 



Spondylus, Plicatula 407 



Fam. II. AviculidcB.—Ayicvla., Posidonomya, Aviculo -pecten, 



Gervillia, Pema, Inoceramus, Pinna 415 



Fam. III. Mytilid(B.—^lyi\hx%, Myalina, Modiola, Hippomya, 

 Dreissena 42C 



