ON MOLLrSCA OF THE WEST COAST OF XORTH AMERICA. 515 



l80. Area semfis is from W. Africa ( not " E. Indies ") : oue of tlie mauj rejirestentativo 

 species between the two West Coasts. 



]f^5. Noetia reversa, Gray. 



7 S(5. Argina hrcvifrons, Sby. 



1*<S. This is the young oi Barhntia alternata. 



liU-lOo belong to the group liarhatia. 



\\Y?,. =Barbatia Taboijensis, from type. 



208. The young of this shell is Avtcufa liheUa, Hve. Pr. ("lould protests ngainst 

 some of the interpretations here given to his views. 



204. The \V. American pearl-oyster should stand as M. Jimbriata, Dkr. It has 

 been redescribed as M. barbata, live. 



212. Dr. frould protests against the Pacific shells being regarded as O. VirffiDi'rn. 

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

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



214ft. The O. pahmdn 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. punctulata, C. B. Ad., non A. Ad. 



22'.). Haminea ci/mbiforniis is closely allied to JI. virvsri'iis, Sby. 



239. Siphonaria lecanium. S. mattra, Sby., is one of the varieties of this species. 

 The aS. pa/mata may prove distinct. S. ferniyinea, live., is probably ae- 

 scribed from the intermediate form. 



242. lanthiiw striulata. Xame given in ignorance oi striolaia. Ad. and Rve. ; anil 

 not needed, teste Rve. 



245. The Denialhnn htfaUmtm of Phil, is probably the young of D. semipoUtum : 

 this species is distinct. 



217. The Dent, pretiosum of Nutt. is a northern species ; this is most likely D. laa- 

 teiim, Phil. 



248-250. This t\-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, 250. These species belong to Ischnocht'fon, Gray. 



2do. Lepidnpleurus, Risso, has sculptured valves and scaly margin, and is probably 

 synonj'uious with Lophtinis, II. and A. Ad. The nam(> may be retained for 

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

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



S')?. Chiton, II. and A. Ad., = Acanthoptetira ((Juild.), (4ray. 



2(i2. =Nac('lhi pdtoides, n. s. (described from Cape St. Lucas specimens). 



20.{. The true Lottia pintadina of Gld. (teste figured types) consists entirely of 

 varieties of A. patina. 



2C5. The " large flat shell " referred-to is TedureUa grandis, Gray, Brit. Assoc. Rep. 

 1861, p. 137. TvctnrvUa is preoccupied by Stimp«. Gr. Manan Invert. It 

 being needful to di%-ide the old genus Acnteen, Lottia may be used for this 

 section. By reviving sjiionyms as sectional names, when a oenus is divided, 

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

 rious nomenclature lessened. Tiie species is Lottia giyantea (Sby. Gen.}. 



200. ScKtcllina naviccUoides, C]')T.,= Crtpidulu oscidan.% C. B. Ad. 



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

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

 an accidental variety. 



282. CuUopomn Fol\kesii=tes,wUatinn, Rve., is the Lower Califomian form, and 

 probably distinct. 



^'^'^•b. = Tarbo p/iasianr/ta, C. B. Ad., non .\filaraplir phasianr!/a, Phil. 



281). The first name is T. eximiitu, Rve., 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 '' speciosu,<i, Japan." Trochus being now generally retained 

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

 Swainson's excellent name Calliostoma for the " Ziziphinwi "group. A specitic 

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

 been accurately described. 



81 



