ON MOLLTJSCA OP THE WEST COAST OF NORTH AMERICA. 



561 



In the ' Malacological and Conchological Magazine/ by G. B. Sowerhy, 

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

 probably belong to the N. W. Coast, and are figured in the Conch. 111. ; 



Page. 



25. Margarita striata, Brod. and Sby. Boreal Ocean. 

 20. Margarita undulata, Sby. Arctic Ocean. 



26. Margarita costellata, Sby. [Non Brit. Mus. Col. = 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 Grosnlandicum. 



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

 'Genera of Recent and Eossil 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 ' Conchologia 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. References 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 :- 



Bve. 



!: g - 



3. 

 4. 

 1. 



1. 



2. 

 6. 

 2. 

 3. 

 4. 

 3. 

 6. 



2. 

 2. 

 1. 



, Gmel.,= T. rufescenSjChem.," Rve."], 

 Lwdttaria p., Schum." Rve. C. S.], 



Dillw.]. 



I Sby. 



! Fig. Sowerby'g Genera. 



I 2. Cumingia trigomdaris. 



3. Cumingia lamellosa. 



4. Cumingia coarctata. 



1. Tellina opercidaris [" = 



1. Lucina punctata [Linn v 

 2,5. Venus subrugosa. 



7. Venus gnidia. 



2. Cytherea planulata. 



3. Cytherea aurantiaca. 



4 [non 3]. Lithodomus caudigerus 



3. [Appears to represent attenuatus, Desk.] 



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



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

 2. Lima squamosa [Lam.]. 



2. Ostrea Virginica [Lam.]. 



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

 Gulf of Dulce, in Costa Rico." 



1. Lottia gigantea, Gray. Genus named in Phil. Trans. =Patelloides, 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. = Tecturella 

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



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



species, S. thersites.~] 



2. Crepidula onyx. 



4. Crepidida aculeata: U =P. auricula, Gmel." 



3. Caluptrcea ? extinctorium. [Sby.j non Lam. 



imbricataJ] 



4. Calyptrcea spinosa. 



The non-pitted form of 



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

 issues ; teste Hani. 

 1863. 



