FAMILIES AND GENERA. 97 



. (EULAMELLIBRANCHIATA.) Plate v. 

 Cy ami urn, 49. 



Cavoliniidse. (OPISTHOBRANCHIATA.) Plate xxx. 

 Clio, 584. 



CePithiidSB. (PROSOBRANCHIATA.) Plate xxiv. 



Cerithium, mouth small, with a groove at its base, short and 



recurved, 443-446. 

 Cerithiopsis, mouth small, with a canal, short, truncated, and 



straight, 447-45 1 - 



Chitonidse. (AMPHINEURA.) Plate xvi. 

 Chiton, 190-200. 



ClioniddB. (OPISTHOBRANCHIATA.) Plate xxx. 

 Clione, 585. 



Columbellidse. (PROSOBRANCHIATA.) Plate xxvi. 

 Colwnbella, 511, 512. 



Conidse. (PROSOBRANCHIATA.) Plate xxix. 



Mangilia, inside of mouth grooved, outer lip notched at its junction 

 with periphery, 530-535. 



Pleurotoma, inside of mouth smooth, outer lip notched below its 

 junction with periphery, 536-549. 



CyelOStomatidse. (PROSOBRANCHIATA.) Plate xxiii. 

 Cyclostoma, 397. 



Cyelostrematidse. (PROSOBRANCHIATA.) Plate xxi. 

 Cyclostrema, 335-337. 



Cypraeidse. (PROSOBRANCHIATA.) Plate xxv. 

 Cyprcea, outer lip ribbed, 457. 

 Ovula, outer lip plain, 458. 



CyprinidSB. (EULAMELLIBRANCHIATA.) Plate v. 



Cyprina, beak not spiral, 3 cardinal teeth, 53. 

 Isocardia, beak spiral, 2 cardinal teeth, 54. 



. (EULAMELLIBRANCHIATA.) Plate vii. 



Spkarium, shell nearly equilateral, with two siphons, beak near 

 middle of dorsal margin, 81-84. 



Pisidium, shell inequilateral, with one siphon, beak near anterior 

 end, 85-89. 



