ON* MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 5G1 



In the ' Malacological and Conchological Magazine,' hy G. B. Sf>wf>rV>y, 

 London, 1S38, is a monograph of Leach's genus Mdnjnritti. The fdlowiug 

 probably belong to the N. W. Coast, and are figured iu the Conch. 111. : — 



i?"). Margarita striata, Brod. and Sby. Boreid Ocean. 



i!l). Marr/arita undulata, Sby. Arctic Ocean. 



2'>. Mitnjarita costelMa, Sby. [Non Brit. Mu«. Cn\. = M. pupilla, Old.; differs in 



liaving; the interspaces of the spiral ribs decussated. Arctic Oceau. J 

 2(1. Maryarita acuminata, Sby. Arctic Ocean. 

 iJO. Aphrodite columba, Lea, = Cardium Granlandicum. 



Several West Coast species were named and figured in the elder Sovrerby's 

 'Genera of Recent and Fossil Shells,' London, 1820-1824 ; a work of singular 

 merit for its time, but left unfinished*. The stock was j^nrchased by a dealer. 

 With a view to completion ; but newer works have occupied its place, and 

 the valuable plates and text remain useless in his hands. As no dates appear 

 ill the bound copy of the work, it cannot be stated whether the species here 

 named bj- Mr. Sowerby had been before published. The loss of the original 

 work has been in some respects supplied by the completion of the extremely 

 similar ' Conchologia Systematica,' by L. lleevc, vol. i. 1S41, vol. ii. 1842. 

 It might almost be considered a second edition of the ' Genera,' of which 

 some of the plates occur in the quarto form. References are here given to 

 the species reproduced from Sowerby's unfinished work, which is often quctcd 

 by Mr. Reeve according to the " Numbers " in which it appeared : — 



Bve. I Sby. 



Fig. ' Fig. Sowerby's Genera. 



2. I 2. Cumiiif/ia trigomdaris. 



3. 3. Cumingia lanwllosa. 



4. : 4. Cumingia cnardata. 



L I 1. Tellina opercu1uri'i\'^-T.omrr^ihta,Gm(A.,= T. ruf('xcens,Cheva,,-''V,,\-&.\ 



1. I \. Luciua punctata \lAmi.,^^=TjeTiiilaria p., ^dinm.''' li\ti.C.^.']. 



2. i 2,5. V mis suhrugosa, 



5. I 7. Vt v.s' gnidia. 



2. I 2. Cgt/wrea planulata. 

 3. Cgtherea aurantiacn. 



4 [non 3]. Lithodomus caudigerta [LAm,,=aristatus, Dillw.]. 

 3. [.\ppears to represent attcmiaius, Dt'sh.l 

 6. Modiola semifusca [inside view ; exactly accords with Braziliensis, Maz, 



Cat., but is not Lamarck's species, teste Ilanl.]. 

 2. Lima squainosa [Lam.]. 



2. Ostrea Virginica [Lam.]. 

 1. Placunannmin Cumingii. "Brought by Mr. Henry Cuming from the 



Gulf of Dulce, in Costa Rico." 



1. Lottia gigantea, Gray. Genus named in Phil. Tmns. = Pafclloidcs, Quoy 

 and Gaim. ? South America. [The U. S. E. E. specimens were la- 

 belled " Valparaiso.'' It comes to us from many parts of the world, 

 but is only known to live in Middle and Lower California. = TvcturtUa 

 grandis, Cpr., B. A. Re^). 1861, p. 137. 



3. Siphonaria Trisfen.sii. [The figure is singularly like the Vancouver 

 species, S. thersites.'] 



2. Cnpidula omji. 



4. Crcpidula acuknta : "=P. auricula, Gmel." 



3. Calgptrcea ? extinctorium. [Sby., non Lam. Tlie non-pitted form of 

 imhricata.'\ 



I 4. Cahjptrcca gpinosa, 



• The laet Part (no. 34) appeared " March 31, 1831," many years after the prcTioui 

 issues ; teste Uanl. 



1803. Am 



a 

 4. 



