COXTE^-TS. xiii 



PAGE 



Fam. IX. Fhyllirhoidce. — Phyllirhoe 338 



Fam. X. Ebjsiad(€. — Elysia, Actconia, Cenia, Limapontia, 

 Ehodope 339 



OkDER IV. NrCLEOBRANCHIATA 340 



Fam. I. Firolidcc. — Fii'ola, Carinaria, Cardiapoda 342 



Fam. II. Atlantidce. Atlanta, Porcellia, BeUeroplion, Cyr- 



tolites, Maclurea 3-13 



Class III. PxERoroDA 346 



Section A. Thecosomata 348 



Fam. I. KyaUidcc. — Hyalea, Cleodora, Curieria, Theca, 



Pterotlieca, Conularia, Euxybia, C3^mbiilia, Tiedemaimia . . 348 

 Fam. II. Limacinidce. — Limacina, Spirialis, Cheletropis, Mac- 

 giUivrayia 351 



Section B. Gymxosomata 353 



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

 docca ! 353 



CHAPTEE III. 



Class IT. Bkachiopoda 354 



Fam. I. TerebratuUdce. — Terebratula, Tcrebratella, Argiopc, 



Thecidium, Stringocephalus 363 



Fam. II, Splriferidce. — Spirifera, Atbyiis, Eetzia, TJncites. . 371 

 Fam. III. EhyncJwnellidcc. — EbyncboneUa, Pentamerus, 



Atrypa « % 375 



Fam. IV. OrihidoB. — Ortliis, Stropbomena, Davidsonia,- Cal- 



ceola 379 



Fam. V. TroductidcB. — Producttis, Stf^pbalosia, Cbonctes . . 383 



Fam. VI. Cmniadce.—^CvQXiXA. SS6 



Fam. VII. Discinida:. — Discina, Sipbonotreta 388 



Fam. VIII. Z2';?^i^?iVfe.— Lingiila, Obolus -. 390 



CHx\.PTEE IV. 



Clas3 v. Coxchiteha 393 



Sectiox a. AsipnoxiDA ^0(> 



Fam. I. Os^>-c«V^«.— Ostrca, Anomia, Placuna, Pccten, Lima, 



Spondylus, PHcattda 407 



Fam. II. AviculidxE. — Avicaila, Posidonomya, xVviculo -pccten, 



GcrYiUia, Perna, Inoceramus, Pinna 415 



Fam. III. ilf?/^j7«(?«.-i]\iytnus,.MyaHna, Modiola, Hippomya, 

 Dreissena > ^20 



