INDEX OF SPECIES. 



25' 



Byssoarca 



alternata, 310, P 137. 

 Americana, 364, 

 aviculoides, 310. 

 divaricata, O 249, P 142. 

 ?Domingensis, O 364. 

 fusca, 310,0249,0 364, P 140. 

 gradata, O 249, 310, 364, 



366, P 141, U 203. 

 illota, I S3, 249, O 310, 



P 141, P 142. 

 lactea, P 141, P 143, 366. 

 mutabilis, 24, lo" 200, 249, 



310, P 139. 

 PaciQca, 24, 107, 153, O 249, 



O310, P 138, P 139, P 296. 

 pernoides, 227, O 310, U 202. 

 pholadiformis, 200,0278,0 310. 

 pusilla, O 249, P 142. 

 solida, O 249, 3 10, 364, 366, 



P 142, P 143, U 203. 

 Tabogeusis, 200, O 278, 310, 



P 141. 

 tetragona, 366, P 139. 

 truncata, O 183, 310, 359. 

 vespertilio, 249,0 310, P 140. 

 Cadium 



dentatutn, 238. 

 ringens, 238. 

 Caecum: See also under sections 



Anellum, Elephantulum, 



and Fartulum. 

 abnorraale, P 316, X 420. 

 anuulatum, X 417, X 423. 

 bimargiii um, X 421, X 440. 

 Clarkii, X 443. 

 clafhratuja, 39, P 322, X 428. 

 rar. compactum, 256, P 322. 

 Cooperi, 9S, 141. 

 corrngnlatum, X 433, P 327. 

 crebrifinctum, 98, 141. 

 dimimituiu, 186, O 4, O 166, 



256, O 272, P 321, X 427, 

 dextroversum, P 328, X 433. 

 (dextroversum, var.) Antilla- 



rum, X 433" 



Cscum 



eburnenm, 186, 4, 166, 



272, X 427. 

 elegantissiiuuiu, X 429, X 430. 

 (elegantissiuium, var.) riearles- 



Woodii, X 430. 

 elongatuni, P 320, X 424. 

 elongatuni, var. semilaeve, X429. 

 farcimen, X 431. 

 firmatum, 186, 4,0 166, 256, 



272, 357, P 319, P 320, 



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

 firmatum, var., O 272, 273. 

 Floridanum, X 42S, X 429. 

 glabriforme, 366, P 327, P 



32S. 

 glabruni, O 366, P 313, P 314, 



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



X 436. 

 gracile, X 429.] 

 gnrijulio, X 4.'36. 

 lie[itagonum, P 319, X 422, 

 imbricatum, X 422. 

 imperforatum, P 321, X 413, 



X 425. 

 incurvatum, X 434, X 436.J 

 insculptum, P 315, X 420. 

 Iseve, 155, 1S6, 272, P 314, 



P32S, P326, X43I. 

 laqueatiim, 186, O 272, P 315, 



P 328, X 420. 

 liratocinctnni, 155, P 315, P 316, 



P317, P 319, X -'21. 



liratum, X 421. 



mauiillatum, X 427, X 434, 



X 430. 

 mamillatum. rar. subulatum, X 



434- 

 mammillum, X 434. 

 monstrosum, 4, O 166, 256, 



O 272, P313, P321, X 427. 

 nitidum, X 439. 

 obtusum, P 317, X 421. 

 parvum, 1S6, 256, 273, 



Pi-,-> 



plicatum, X 421. 



