ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 515 



186. ArcnsentUs is from "W. Africa 'not "E.Indies"; : one of tlie immy representative 



species between the two West Coasts. 

 185. Noetia reversa, Gray. 

 7 S6. Argina hrcvifrons, Sby. 

 188. This is the young of Barhntia alternata. 

 191-195 belong to the group Barhatia. 

 19-3. =Barbatia Tabor/ensis, from type. 



203. The young of this shell is Avinda liheUa, Rve._ Dr. Gould protest? ngainst 



some of the interpretations here given to his views. 



204. The W. American pearl-oyster should stand as M. Jimhriata, Dkr. It hsis 



been redescribed as 31. harhata, Eve. 



212. Dr. Gould protests against the Pacific shells being regarded as O. Vircjinica. 

 Mr. Hanley adheres to his original opinion. Fossils sent from the Sand- 

 wich Is. by Mr. Pease (O. Sandwichotsis, Pse.) appear scarcely to differ. 



2146. The O. pabnuJa appears a distinct species. 



215. This species is identical with O. no. 384 of C. B. Ad. It may take the name 

 of O. amara from its " bitter flavour." 



224. Bulla Adamsi=B. pundulata, C. B. Ad., non A. Ad. 



229. Ilaminea cpnbiformis is closely allied to H. virescens, Sby. 



239. Siphonarialccamum. S. maura, Shy., is one of the varieties of this species. 

 The -S". palmata may prove distinct. S. ferruginea, Rve., is probably de- 

 scribed from the intermediate form. 



242. lanthina striulata. Name given in ignorance of striolata, Ad. and Eve. ; and 

 not needed, teste Eve. 



245. The Dentalium hyalinnm of Phil, is probably the young of D. scmipoJltum : 

 this species is distinct. 



247. The Dent, pretiosum of Nutt. is a northern species ; this is most likely B. lac^ 

 tetim, Phil. 



248-250. This tj'pical group of Chitonids retains the Linnean name in Dr. Gray's 

 arrangement ; and as he first pointed out the generic distinctions in the 

 family, his judgment is to be prefeiTed. 



252-254, 256. These species belong to Ischnochiton, Gray. 



255. Lepidopleiirus, Eisso, has sculptured valves and scaly margin, and is probably 

 synonymous with Lophyrus, H. and A. Ad. The name may be retained for 

 the " Lophyroid " Ischnochiton here described, the peculiarities of wliich have 

 been confirmed by adult specimens in Mus. Cuming, and by other species. 



257. Chiton, H. and A. Ad., = Acanthopleura (Guild.), Gray. 



2(j2. =Nacellapeltoides, n. s. (described from Cape St. Lucas specimens). 



263. The ti-ue Lottia pintadina of Gld. (teste figured types) consists entirely of 

 varieties of A. patina. 



2G5. The " large flat shell " referred-to is Tedurella grandis, Gray, Brit. Assoc. Rep. 

 1861, p. 137. Tedurella is preoccupied by Stimps. Gr. Manan Invert. It 

 being needful to divide the old genus Acmcea, Lottia may be used for this 

 section. By reviving synonyms as sectional names, when a geuus^is divided, 

 good names may be retained in a restricted sense, and the burden of a spu- 

 rious nomenclature lessened. The species is Lottia gigantea (Sby. Gen.}. 



269. Scutellina navicelloides, C\)r.,= Crejndida oscidans, C. B. Ad. 



280. This should stand as Gailinia stellata, Sby., that name having been given to 

 the normal form. Rep. pi. 7. f. 3a, of which petitegoniostoma, f. 3/, is only 

 an accidental variety. 



282. Callopoma Fokkesii=tessellatn)n, Eve., is the Lower Californian form, and 



probably distinct. 

 2P''M).= Turbo phasianella, C. B. Ad., non Melaraphe phasianella, Phil. 

 289. The tirst name is T. eximiu.s, Eve., P. Z. S. 1842, p. 185 ; Mke.'s shell bearing 

 date 18-50. It appears identical with " Javanicus, Lam.," in Mus. Cum., and 

 is extremely like "sjjeciosus, Japan." Trochus being now generally retained 

 for the Niloticus group, which contains the largest forms, it is best to revive 

 Swainson's excellent name Calliostoma for the '' Ziziphinus "group. A specific 

 name should not be used for a genus, where a distinctive name has already 

 been accurately described. 

 1863. 3j 



