(or) 
lop) 
Or 
ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 
*Sanguinolaria Nuttall. *Trochiscus Norrisii. 
*Macoma secta. *Omphalius ?fuscescens. 
Angulus Gouldii. *Omphalius aureotinctus. 
*tHeterodonax bimaculatus. +Crucibulum imbricatum. 
*Donax Californicus. *+Crucibulum spinosum. 
tDonax punctatostriatus. +Crepidula arenata and var. 
*Standella ?Californica. +Cerithium uncinatum. 
*Pachydesma crassatelloides, *Cerithidea pullata. 
*tAmiantis callosa. +Cerithidea Montagnei. 
*Chione simillima. *Litorina planaxis. 
. tChione neglecta. Luponia sp. ind., jun. 
*Tapes staminea, Conr. +Trivia Solandri. 
+Tapes grata and vars. *Trivia Californica. 
*Lucina Californica. Drillia penicillata. 
Lucina bella. Myurella, sp. 
*Mytilus edulis. (One young specimen, | *tNeverita Recluziana. 
perhaps from San Francisco.) +Natica Maroccana. 
*Septifer bifureatus. *Scalaria (Ind. var.) tincta. 
tPecten subnodosus, ventricosus. +Bezoardica abbreviata. 
*Pecten monotimeris and vars. +Leucozonia cingulata, 
*Hinnites giganteus. tStrigatella tristis. 
*t+Ostrea conchaphila. *Olivella biplicata. 
*+Anomia ?lampe. *Purpura ostrina, vars. 
Siphonaria sequilirata. +Purpura biserialis. 
*+Melampus olivaceus, Monoceros lugubre. 
Helix arrosa. +Vitularia salebrosa. 
*+Bulla nebulosa. Cerostoma monoceros. 
*tIschnochiton Magdalensis. Ocinebra Poulsoni. 
*Acmea persona, var. textilis. Chorus Belcheri. 
*Acmea scabra, var. limatula. +Columbella fuseata. 
*Acmea Pspectrum, jun. *Columbella carinata. 
*Lottia gigantea. +Strombina gibberula, 
*Lucapina crenulata. | tAnachis coronata. 
*Fissurella volcano. | *tNassa tegula. 
*Haliotis splendens. +Nassa complanata. 
*Haliotis Cracherodii. Macron Kellettii, 
*Pomaulax undosus. *Macron lividus. 
Callopoma tessellatum = Fokkesii. 
The shells of Margarita Bay, on the Pacific coast of Lower California, in 
lat. 24°, have become known through W. Harper Pease, Esq., of Honolulu, 
Sandwich Islands. Through his labours we are likely soon to be favoured 
with accurate accounts of the distribution of species in the various parts of 
the Pacific Ocean. Already his researches have greatly enriched our know- 
ledge of the quaint fauna of the Sandwich Islands, from which he has elimi- 
nated the spurious species, and added those erroneously ascribed to California 
by previous naturalists. The principal trade from these islands is with San 
Francisco; and “the coast,’ in Mr. Pease’s writings, signifies the coast of 
California or (generally) of Western America. Many of our best specimens 
of rare West-coast shells have been received from: him, and in remarkably 
fresh preservation. The Margarita Bay species were obtained by one of his 
trained collectors, and are as follows :— 
Martesia intercalata. Donax punctatostriatus. 
Saxicava pholadis Dosinia ponderosa. 
Solecurtus yviolascens. Callista chionza, 
Hiatula compacta. Callista vulnerata (?=tricolor, Pse.). 
*Tellina secta. Chione succincta 
Strigilla carnaria (pink). Chione gnidia, 
Semele Californica. Tapes grata. 
