ox MOLLrsCA OF THE WEST COAST OP NORTH AMERICA. 561 



In the ' Malacologioal and Conchologioal Magazine,' by G. B. Sow^rhy, 

 London, 1838, is a monograph of Leach's genus Margarita. The following 

 probably belong to the N. W. Coast, and are figured in the Conoh. 111. : — 



Page. 



25, ^Lnrgarita striata, Brod. and Sby. Boreal Ocean. 

 20. Margarita niuhdata, Sby. Arctic Ocean. 



26. Margarita costellata, §J)y. [Nou Brit. Mus. Gpl. = M. pupilla, Gld. ; differs in 



having- the interspaces of the spiral ribs decussated. Arctic Ocean.] 

 26. Margarita acuminata, Sby. Arctic Ocean. 

 30. Aphrodite columba, Lea, = Cardium Grcenlandicum. 



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

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

 merit for its time, but left unfinished*. The stock was purchased 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 

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

 named by 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 ' Conohologia Systematica,' by L. Eeeve, vol. i. 1841, 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. Eeferences are here given to 

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

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



E-re. I Sby. 



3rig. Fig. Sowerby's Genera. 



2. 2. Cumingia trigonularis. 



3. 3. Cumingia lamellosa. 



4. ' 4. Cumingia coarctata. 

 1. Tellina opercylaris ["= T./ypfr-nilata, Gmel.,= T. rufescens,Ch.em,," Eve.]. 



1. JUicina punctata [Linn., " = Lerdilaria p., Schum." Iftre. C. S.]. 

 2,5. Venus mbrugosa. 

 7. Venus gnidia. 



2. Cgtherea planulata. 



3. Cytherea aurantiaca. 



4 [non 3]. lAthodomus caudigerus \lj&\a.,= aristatus. Dill w. J. 

 3. [Appears to represent attenuatus, Desh.l 

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



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



2. Lima squamosa [Lam.]. 

 2. I 2. Ostrea Virginica [Lam.]. 

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



Gulf of Dulce, in Costa Eico." 



1. Lottia gigantea, Gray. Genus named in Phil. Turns. =PateUoides, 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, 

 hut is only known to live in Middle and Lower California. = Teciurella 

 grandis, Cpr., B. A. Eep. 1861, p. 137. 



3. Siphonaria Tristensis. [The figure is singularly like the Vancouver 

 species, <S'. thersites.'] 



2. Crepidula onyx. 

 4. 4. Crepidula acukata: "=P. auricida, Gmel." 



3. Calyptrcea ? extinctorium. [Sby., non Lam. The non-pitted form of 

 inihricata.'] 



4. Calgptrcea spinosa. 



* The last Part (no. 34) appeared " March 31, 1831," many years after the previoiu 

 issues ; teste Hani, 



1863. 47 



I 



