ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 203 



form of the common species : P. 360. Cardium Californiense, Califor- 



also found at Mazatlan. nia. M. Z. pi. 47. = C. Nut- 



P. 358. Petricola Cordieri, California. tallii, Conr. : not C. Califor- 



=1 Venus lamelUfera, Conr. M. nianum, Conr. 



Z. pi. 18. Siphonaria scutellum, "He Cha- 

 Pe/ricoZa arcwafaj California. M. tam." ? Galapagos. 



Z. pi. 19. Purpura Freycinetii, Kamtschat- 

 Petricola cylindracea, California. ka. M. Z. pi. 26. Much more 



(Probably P. arcuata, var.) M. like P. lapillus than Midden- 



Z. pi. 20. doriF's figures. 



P. 359. Venerttpis gigantea, California. Murex macropterus. 



=Saxidomus Nuttalli, Conr. Helix Dupetithouarsi, Monterey. 



Venerupis Petiti, California. M. Z. pi. 30, as " rsii." 



^Tapes diversa. Sow. jun. P. 361. Velutina Mulleri, Kamtschatka. 



Anomia macrochisma, Kamt- Turbo digitatus, Acapulco. 



schatka. M. Z. pi. 34. =Pla- = Uvanilla unguis. Wood. M. 



cunanomia m., Gray. Z. pi. 36. 



Cypricardia Duperreyi, Callfor- Natica Recluziana, California. 



nia. M. Z. pi. 27. M. Z. pi. 37. 



Modiola cultellus, Kamtschatka. Natica ianthostoma, Kam- 

 P. 360. Cardium Laperousii,Ca\iioTmsi*. tschatka. 



M. Z. pi. 48. Natica sanguinolenta. 



To the above must probably be added Purpura emarginala, p. 360, M. Z. 

 pi. 25, described by Deshayes as from New Zealand, but quoted in Jay's Cat. 

 no. 8972, =.P.Conradi, Nutt. MS., from California; and from the same 

 locality in Mus. Cuming, on the authority of Mr. Hartweg. Many of these 

 shells were figured in the following year in Gu6rin's Magasin de Zoologie, 

 between plates 14' and 48, of which references are given above. In the same 

 works are described, Lucina cristata, Reel. Rev. Cuv. 1842, p. 270, Guer. 

 Mag. pi. 60, found " sur le banc de Campeche" by M. J. Cosmao, Commander 

 of the Naval Station of Mexico, = Tellina Burnetii Bred. & Sow. : and Lucina 

 corrugata, Desh., Guer. Mag. pi. 82, as from California, which Mr. Cuming 

 found himself at Singapore. 



The official description of the shells of the Venus, however, was intrusted 

 to M. Valenciennes, under whose auspices was published " Voyage autour du 

 Monde sur la Venus, pendant les annees 1836-39, par M. du Petit Thouars. 

 Paris, 1846." Of this work plates only have been seen, of which the following 

 are species connected with the West N. American coast. 



Helix vincta, Val. (CaUfornia, Rve.) 



Pliolas rostrata, Val. Almost certainly the young of one of the 

 following species. 



Penitella Conradi, Val. {Pholadidea, with long, inflated cup, 

 without divisions.) 



PenilcUa xilophaga, Val. {Pholadidea, with long, narrow cup.) 



Penitella tubigera, Val. Probably a variety of the last ; the tube 

 being simply the lining of the old cavity, as in P. calva. 



Bornia luticola, Val. (Closely approaches Chironia Laperousii^ 

 Desh.) 



Saxicava clava, Val. (Probably S. legumen, Desh.) 



Venus perdix, Val. ? = Chione neglecta, Sow., represented with- 

 out pallial sinus. 



Venus pectuncidoides, Val. = Tapes Jiistrionica, Sow. 



Trochus amictus, Val. ^ Uvanilla unguis, Mawe. = Turbo digi- 

 tatus, Desh. 



* Described from a single sliell which appears worn. It has much the aspect of a Tellina, 

 with concentric ridges and no internal crenations; but is figured without pallial sinus. 



