ON MOLLUSCA OF THE WE8T COAST OF NORTH AMERICA. 561 
In the ‘ Malacological and Conchological Magazine,’ by G. B. Sowerby, 
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. Ill. :— 
Page. 
25. Margarita striata, Brod. and Sby. Boreal Ocean. 
26. Margarita undulata, Shy. Arctic Ocean. 
26. Margarita costellata, Sby. [Non Brit. Mus. Col. = JL pupilla, Gid.; differs in 
having the interspaces of the spiral ribs decussated. Arctic Ocean. | 
26. Margarita acuminata, Shy. Arctic Ocean. 
30. Aphrodite columba, Lea,= Cardium Granlandicum. 
Several West Coast species were named and figured in the elder Sowerby’s 
‘Genera of Recent 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 haye occupied its place, and 
the valuable plates and text remain useless in hishands. 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. Reeve, 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 :-- 
Fig. | Fig. Sowerby’s Genera. 
2. Cumingia trigonularis. 
5. Cumingia lamellosa. 
4, Cumingia coarctata. 
1. Tellina opercularis {= T. operculata, Gmel., = T. rufescens,Chem.,” Rye. }. 
1, Lueina punctata [Linn., “= Lentilaria p., Schum.” Rye. C. 8.}. 
2,5. Venus subrugosa. 
7. Venus gnidia. 
2. Cytherea planulata. 
3. Cytherea aurantiaca. 
4 [non 3]. Lithodomus caudigerus [Lam.,=aristatus, Dillw.]. 
3. [Appears to represent attenuatus, Desh. 
. Modiola semifusca [inside view; exactly accords with Braziliensis, Maz, 
Cat., but is not Lamarck’s species, teste Hanl. }. 
PROS: Ge Coe RO'OURS I Ee Cork 
2. 2. Lima squamosa [ Lam. ]. 
2 2. Ostrea Virginica [Lam. }. 
if 1. Placunanomia Cumingii. “Brought by Mr. Henry Cuming from the 
Gulf of Dulce, in Costa Rico.” 
1. | 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. 
8. Siphonaria Tristensis, [The figure is singularly like the Vancouver 
species, S. thersites. | 
2 2. Crepidula onyzx. 
4, | 4. Crepidula aculeata: “=P. auricula, Gmel.” 
3. Calyptrea ?extinctorium. [Sby., non Lam. The non-pitted form of 
imbricata. | 
4. Calyptrea spinosa. 
_ * The last Part (no, 34) appeared “ March 31, 1831,” many years after the previous 
issues ; teste Hanl. 
1863. 20 
