C0E'TE]srTS. xiii 



PAGE 



Fam. IX. FhyllirhoiclcB. — Phyllirlioe 338 



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

 Khodope 339 



Order IV. Nugleobrakghiata 3-i0 



Fam. I. FiroUclcB. — Firola, Carinaria, Oardiapoda 342 



Fam. II. AUcmtklce. Atlanta, Porcellia, BeUeroplioii, Cjx- 

 tolites, Macl"area 343 



Class III. Pteropoda 346 



Section A. Thegosomata 348 



Fam. I. SijaleidcB. — Hyalea, Cleodora, CuTieria, Theca, 



Pterotheca, Conularia, Eurybia, Cymbulia, Tiedemannia . . 348 



Fam. II. LimaciniclcB. — Limacina, SiDixialis, Cheletropis, Mac- 



gilHyrajda 351 



Section B. Gymnosomata 353 



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

 docea 353 



CHAPTER III. 



Class IV. Braghiopoda , 354 



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



Thecidium, Stringocepbaliis 363 



Fam. II. SinriferidcB. — Spirifera, Atliyris, Petzia, Uncites. . 371 

 Fam. III. Rhynchonellidce. — Illiyncb.onella, Pentameriis, 

 Atrypa 375 



Fam. IV. OrthidcB. — OrtMs, Stropbomena, Da^ddsonia, Cal- 

 ceola 379 



Fam. V. FroductidcB. — Productus, Stropbalosia, Cbonetes . . 383 



Fam. VI. CraniadcB, — Crania 386 



Fam. VII. DiscinidcB. — Discina, Siphonotreta 388 



Fam. VIII. Lingididce. — Lingnla, Obolns , 390 



CHAPTER IV. 



Class V. Conchipera 393 



Section A. Asiphonida 406 



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

 Spondylns, Plicatula 407 



Fam. II. Avimlidce. — Avicnla, Posidonomya, Avictdo -pecten, 

 (^erviUia, Perna, Inoceramns, Pinna 415 



Fam. III. Jf^^;^7^■^i^.— Mytilus, MyaHna, Modiola, Hippomya, 

 Dreissena 420 



