522 



INDEX. 



Macoma — Contimird. 



proxima, 95. 

 Macrocyclis concava, 406. 

 Mactralateralis, 77. 

 ovalis, 75. 

 polijinjma, 75. 

 ponderosa, 75. 

 soUdissima, 73. 

 Mnmma immaciilata, 344. 

 Margarita acuminata, 'i84. 

 (irctica, 281. 

 argentata, 282. 

 caiiipanulata, 282. 

 cinerea, 279. 

 helicina, 281. 

 niimitissima, 280. 

 obsciira, 283. 

 uiidulata, 280. 

 varicosa, 285. 

 Margaritana arcuata, 174. 

 niarginata, 177. 

 uiuUilata, 176. 

 Melampus bidcntatus, 467. 

 Melanthodecisa, 289 

 Mdihwa arbnscula, 236. 

 Mencstlio albula, 333. 

 Mesodcsma avrtntn, 80. 



Jaidesii, 81. 

 Modiola discois, 193. 



discrejmns, 192. 

 ylandnia, 194. 

 modiolus, 186. 

 nexa, 190. 

 piclinula, 195. 

 plicatula, 188. 

 Modiolaria corrugata, 193. 

 discors, 192. 

 nigra, 190. 

 Molgula arenata, 21. 

 pioducta, 21. 

 Moiitac.nta bidi-ntata, 86. 



elcvata, 86. 

 Mya aronaria, 55. 



tnincata, 58. 

 Mytilus edulis, 183. 



pellucidus, 184. 



N. 



Nassa ohsoleta, 362. 



trivittata, 364. 



vibex, 305. 

 Natica cmmliculatn, 348. 



clausa, 342. 



dnplicata, 345. 



Jidva, 347. 



heros, 338. 



immdcuUtta, 344. 



pimlln, 341. 



pnsilla, 344. 



trisrriata, 340. 

 NeoBra pcllucida, 61. 

 Neverita dnplicata, 343. 

 Niobe zonata, 258. 



Nucula {see also Leda and Yoldia) 

 delphinodonta, 153. 

 cx]iausa, 152. 

 intlata, 152. 

 ])ruxima, 150, 

 tenuis, 149. 



o. 



Odostomia bisuturalis, 327. 



dealbata, 327. 



exirjua, 327. 



1 11 sea, 325. 



impressa, 330. 



jiiodrsta, 327. 



producta, 325. 



seminuda, 329. 



tritida, 328. 

 Ommastruphes Bartramii, 512. 



sagittatus, 510. 

 Osteodtsmu lii/aliiia, 64. ■- 



Ostrea borealis, 203. 



Viiginiana, 202. 



PaJudina derisa, 289. 

 Pandora trilineata, 62. 

 Panopa^a arctica, 51. 

 Patella Candida, 270. 

 Pecten concentricus, 199. 

 fuscus, 200. 

 irradians, 199. 

 Islandicus, 198. 

 Ma(/ellaiiiciis, 196. 

 tennicostatus, 196. 

 Pdon;iia, 27. 



arenifcra, 27. 

 Pera pellucida, 17. 

 Petricola dactylus, 92. 

 Jbrnlcula, 90. 

 pholadiformis, 90. 

 Philine foriiwsa, 213. 

 iineolata, 214. 

 quadrata, 213. 

 sinuata, 213. 

 Pholas costata, 36. 

 crispata, 39. 

 trunciita, 38. 

 Physa ancillaria, 485. 

 eJongata, 486. 

 heterostropha, 483. 

 Pisidium abditum, 113. 

 Adamsii, 110. 

 wquilatcrale, 112. 

 comiiressnm, 110. 

 dubium, 109. 

 ferrugineum, 113. 

 variabile, 115. 

 ventricosum, 110. 

 Placobrancbus catulus, 250. 



s'nn}ih'X, 257. 

 Planorbis aniiii/erns, 500. 

 bicavinatus, 491. 



