ox MOLLUSCA OF IIIE WEST COAST OF NORTH AMERICA. 



621 



List of Cape St. Lucas Shells. 



Modiola capax. A few living sp. " Gal." [?J. 

 Crenella coarctata. In Spondylus. 

 Lithophayus aristatus. In Sputidi/lns. 

 Lithophayus pltnmda. In Spondylus. 

 Area midticostata. Adult valves, and jun. livinj 



Rai'e. 



Valve. 

 Valves, 



Valves. 



Large valves, and jun. living. 



closi 



Pyssoarca Pacijica. 



Byssoarca inidahilis. 



Barhatia Reeviana. 



Barhatia vespcrtilin. 



Barhatia illota. Valve, 



Barhatia solida. Rare. 



Barhatia yradata. Valve 



A.rinaa yiyantea. 



Axincea, sp. ind. 



Pinna lanceolata. Fragment. 



Pinna maura. 1 sp., jun. 



Pinna ntyosa. 1 sp., jun. 



Maryaritiphorajimbriata. Living. 



Avieula Peruviana. Valves. 



Isoynomon Chemnitziantis. Common, living. 



Isoynomon Janus. 4 sp. living. [One has 

 ligament-pits, passing into costellatus, just as no 

 138, var. passes into incisus.'\ 



Peden suhnodosus. Several valves, and 1 living 

 [P. intermedia is only a var. of this species.] 



Pecten ventricosus. Valves. [The young is P 

 circularis, Sby., pars.] 



Janira dentata. Very plentiful. 



Lima tetrica. 1 living, and valves [=Z. squamosa, 

 teste Cuminy. W. I., Mediter., Pac. Is.] 



Liina arcuata. 1 fresh pair. [Can hardly be separa- 

 ted from L.frayilis, Gal., Pac. Is., in Mus. Cum.] 



Spondylus calcifer. Valves. Red var., and speci- 

 men changing into purple. 



PUcatida penicillata. 1 sp. on Fasciolaria. 



Ostrea iridescens. A few living. 



Ostrea ? Viryinica, jun. 



Ostrea Columbiensis. Valves. 



Ostrea amara. On Pomaulax. 



Cavolina ftekmus. Fragment. (Pelagic.) 



[■ [Nudibranchs and ..4^^/ysm. Not yet determined.] 



Bulla Adamsi, and var. Common. 



Bulla nebidosa. Rare. 



Bulla Quoyi. Very rare. 



Ilaminea resicula. Plentiful, living, 



Haniinea cymhiformis. 1 sp. [Closely related to 

 H. virescens.^ 



Siphonaria cequilirata. Dead. [ful. 



Siplionaria lecanium, with var. palmata, &c. Plenti- 



Oitchidium Carpenteri. Very rare. 



Melampus olivaceus. Rare. 

 [The rest of the Pulmonates will be tabulated 

 afterwards, vide p. 630.] 



lanthina decollata. Very rare. 



Ischnochiton Maydalensis. Large and highly sculp- 

 tured. Very rare. 



