352 



REPORT — 1856. 



The following shells are quoted from San Pedro :- 



Sanguinolaria Nuttalli. 

 *Semele rubrotincta. 

 *Tellina secta. 



Mactra nasuta. 

 * Venus Nuttalli. 



fructifraga. 



Calif omiensis. 



*Tapes straminea. 



gracilis. 



*Diplodonta orbella. 



Cardium cruentatum. 

 *Chama exogyra. 

 *Bulla nebulosa. 

 fAcmjEa mesoleuca. 



*Acmsea scabra. 

 *Scurria mitra. 

 *Trocbus moestus. 

 fCrepidula incurva. 

 fCalyptroea spinosa. 

 fLitorina ? fasciata. 

 Oliva biplicata. 



The following shells are quoted from Guaymas. They all belong to the 

 Southern fauna, except Bulla nebulosa and Venus straminea, which last be- 

 longs to that of Upper California. It may be a wrong determination for the 

 not dissimilar Tapes hisirioiiica. 



Periploma planiuscula. Pectunculus giganteus. OmphaUus rugosns. 



tPetricola robusta. Pecten circularis. Terebra variegata. 



tVenus Columbiensis. *Bulla nebulosa. Conus ferrugatus, 



— Cahforniensis. LopbjTus laevigatus. t regularis. 



• straminea. albolineatus. fNatica maroecana. 



tTapes grata. fAemaea mesoleuca. bifasciata. 



Cardita Californica. fNeritina picta. Fusus pallidus. 



Chama f. Mexicana. tNerita Bernhardi. lignarius. 



Cardium elatum. 



The following shells are quoted from San Juan ; many others are pro- 

 bably from the same place, but are assigned by error to the Straits of the 

 same name in Oregon. 



fTerebra fulgurata. 

 tConus princeps. 

 fOniscia tuberculosa. 

 fCassis coarctata. 

 Ohvella intorta. 



tSanguinolaria purpurea 



Tellina gemma. 

 •Donax Californicus. 



Bulimus pallidior. 

 fRadius variabilis. 



tOlivella tergina. 



? eburnea. 



Monoceros tuberculatum. 

 tPurpura muricata. 

 tMurex pUcatus. 



The following are quoted from La 



Tbracia plicata. 

 fMactra elegans. 



Venus reticulata. 

 tDione Cbionsea. 

 f Artemis gigantea. 



Petricola dactylus. 

 tLucina punctata. 



Modiola capax. 

 tisognomon Chemnitzianum. 



Lima tetrica. 



Pecten nodosus. 



dentatus. 



Spondylus, sp. 



Paz: 



tOstrea Cumingiana. 

 tCancellaria obesa. 



t solida. 



t cassidiformis. 



Sigaretus debilis. 

 fStrombus gracilior. 

 fOliva porphyria. 



t splendidula. 



tPurpura patula. 



* eraarginata. 



t biserialis. 



t kiosquiformis. 



tMurex bicolor. 



78. A mere glance at the general Table, contrasting the species on each 

 side of the double central dividing line, especially leaving out of view the un- 

 certain column of Lower California, will satisfy the inquirer of the marked 

 and rapid separation between the tvvo faunas of California-proper and the 

 Gulf. The actual difference is, however, much greater than the apparent, 

 since the name of a species occurs in a column if only one specimen has beea 

 obtained, whether or not it were living there ; or if living, whether it were 

 an habitual resident or a straggler. For it will be observed that our present 

 lists are much in the condition of those of British shells, before the labours 

 of the dredging naturalists of our own day ; when a W. Indian shell was duly 



