INDEX OF SPECIES. 



25 



Byssoarca 



alternata, 310, P 137. 

 Americana, 364. 

 aviculoides, 310. 

 divaricata, 249, P 142.' 

 ?Doiningensis, 364. 

 fusca, 310, 249, 364, P 140 

 gradata, 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, 



o 310, P 139- 



Pacifica, 24, 107, 153, 249, 



0310, P 138. P 139, P 296. 

 pernoides, 227, 310, U 202. 

 pholadiformis, 200, 0278,0 310. 

 pusilla, 249, P 142. 

 solida, 249, 3 10, 364, 366, 



P 142, P 143, U 203. 

 Tabogensis, 200, 278, 310, 



P 141. 



tetragona, 366, P 139. 

 truncata, 183, 310, 359. 

 vespertilio, 249,0 310, P 140. 

 Cadium 



dentatum, 238. 

 ringens, 238. 

 Caecum : See also under sections 



Anellum, Elephantulum, 



and Fartulum. 

 abnormale, P 316, X 420. 

 anuulatum, X 417, X 423. 

 bimargiuatum, X 421, X 440. 

 Clarkii, X 443. 

 clathratum, 39, P 322, X 428. 

 var. compactum, 256, P 322. 

 Cooperi, 98, 141. 

 corrugnlatura, X 433, P 327. 

 crebricinctum, 98, 141. 

 diminutum, 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, 166, 



272, X 427. 



elegantissimum, X 429, X 430. 

 (elegantissimum, var.) Searles- 



Woodii, X 430. 

 elongatum, P 320, X 424. 

 elongatum, var. semilaeve, X 429. 

 farcimen, X 431. 

 firmatum, 186, 4, 166, 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, 



X 4 36. 



gracile, X 429.! 

 gurgulio, X 426. 

 heptagonum, P 319, X 422. 

 imbricatum, X 422. 

 imperforatum, P 321, X 413, 



X 4 25. 



incurvatum, X 434, X 436.^ 

 insculptum, P 315, X 420. 

 Iseve, 155, 1 86, 272, P 314, 



P 325, P 326, X 431- 

 laqueatum, 186, 272, P 315, 



P 328, X 420. 

 liratocinctum, 155, P 315, P3i6, 



P3 1 ?, P3I9, X 421. 

 liratum, X 421. 

 mamillatum, X 427, X 434, 



X 4 36. 

 mamillatum, var. subulatum, X 



434- 



mammillum, X 434. 

 monstrosum, 4, 166, 256, 



0272, P 313, P 321, X 427. 

 nitidum, X 439. 

 obtusum, P 317, X 421. 

 parvum, 186, 256, 273, 



P323- 

 plicatum, X 421. 



