INDEX OF SPECIES. 



25' 



Byssoarca 



alternata, 310, P 137. 

 Americana, 364. 

 aviculoides, 310. 

 divaricata, 249, P 142. 

 ?Domingensis, 364. 

 fusca, 310, 249,0 364, P 140. 

 gradata, O 249, 310, 364, 



366, P 141, U 203. 

 illota, 183, 249, 310, 



P 141, P 142. 

 lactea, P 141, P 143, 366. 

 mutabilis, 24, 10'' 200, 249, 



310, P 139. 

 Pacifica, 24, 107, 153, 249, 



O310, P 138, P 139, P 296. 

 pernoides, 227, 310, U 202. 

 pholadiformis, 200, O 278, 310. 

 pusilla, 249, P 142. 

 solida, 249, 3 10, 364, 366, 



P 142, P 143, U 203. 

 Tabogeusis, 200, 278, 310, 



P 141. 

 tetragona, 366, P 139. 

 truncata, 183, 310, 359. 

 vespertilio, 249,0 310, P 140. 

 Cadium 



dentatum, 238. 

 ringens, O 238. 

 Caecum: See also under sections 

 Anellum, Elephantulum, 

 and Fartulum. 

 abnormale, P 316, X 420. 

 annulatum, X 417, X 423. 

 bimarginatum, X 421, X 440. 

 Clarkii, X 443. 

 clathratura, 39, P 322, X 428. 

 var. compactum, 256, P 322. 

 Cooperi, 98, 141. 

 corrngnlatum, X 433, P 327, 

 crebricinctum, 98, 141. 

 diminutuiu, 186, O 4, 166, 



256, 272, P 321, X 427. 

 dextroversum, P 328, X 433. 

 (dextroversum, var.) Antilla- 

 rum, X 433. 



Caecum 



eburneum, 186, 4, O 166, 



272, X 427. 

 elegantissimuni, X 429, X 430. 

 (elegantissiuium, far.) Searles- 



Wooilii, X 430. 

 elongatum, P 320, X 424. 

 elongatuni, var. semilaeve, X 429. 

 farcimen, X 431. 

 firmatum, 186, 4,0 166, O 256, 



272, 357, P 319, P 320, 



P 321, P 324, P 326, X 427. 

 firmatum, var., 272, 273. 

 Floridanum, X 428, X 429. 

 glabriforme, 366, P 327, P 



328. 

 glabrum, 366, P 313, P 314, 



P 327, X 413, X 426, X 432, 



X436. 

 gracile, X 429.] 

 gurgulio, X 426. 

 hei^tagouum, P 319, X 422. 

 imbricatum, X 422. 

 imperforatum, P 321, X 413, 



X425. 

 incurvatum, X 434, X 436.' 

 insculptum, P 315, X 420. 

 laeve, 155, 186, 272, P 314, 



P32S, P326, X43I. 

 laqueatum, 186, 272, P 315, 



P 328, X 420. 

 liratocinctum, 155, P 315, P316, 



P317, P319, X 421. 

 liratum, X 421. 

 mamillatum, X 427, X 434, 



X 436. 

 mamillatum, var. subulatum, X 



434- 

 mammillum, X 434, 

 monstrosum, 4, 166, 256, 



272, P 313, P 321, X 427. 

 nitidnm, X 439. 

 obtusum, P 317, X 421. 

 parvum, 186, 256, 273, 



P323- 

 plicatum, X 421. 



