r^a 



KEPORT 13G3. 



•Tape* staminea. 



Chama t'rondosa. 



Cardiuni proceruin. 



Liocardiuin elatum. 



Modiola capax. 



Modiola Brasiliensis. 



Lithophagus attenuatus. 



Barbatia gradata. 



Pecten ventrioosus. 



Ostrea Virginica (Maz. Cat.). 

 •( ),strea lurida, var. 



(Jstrea coachaphila. 



Ostrea amara. 



Siphonaria sequilirata ( = leviuscula, 

 Sbi/., teste Vumitiy). 



Siphonaria grigas. 

 •Helix areolata, Fhs. (The only land- 

 shell received from the Bay.J 



Dentaliuni tetragonuni, Sby. 



Dentalium seniipolituiu. 



Dentalium lacteuin, 1 hil, 



Acnisea strigatella. 



Acniaea atrata. 



Gadinia reticulata. 



Callio.-itoma versicolor. 

 •Chlorostonia gallina. 

 •Chlorostoiiia aureotinctum. 



Nerita scabricosta. 



Nerita liernhardi. 



Crueibuluni spinosum. 



Crucibuluni imbricatum. 



In the above list, the only strictly 

 Tvith a *. 



The following species have been received from La Paz, besides those tabu- 

 lated in Major llich's list, p. 541, in the C. S. L. list, p. 619, and the B. A. 

 Rep. p. 352. It is clear that the fauna of the district is essentially tropical, 

 and remarkably free from Californian species. 



Dentalimn semipolitunu 



Turritella punctata. 



Modulus cerodes. 



Olivella fulyida, Lieut. Trowbridge [teste W. Cooper ; but probably added by 



him accidentally from his W. Afncan collections. It has not been received 



from any other West-coast source], 

 Siphonalia modificata. Dead. 



A very interesting senes of shells were collected at Guaymas and Pinacati 

 Bay, by Capt. Stone and Mr. Sloat. The latter gentleman affixed MS. names 

 to those which he regarded as new. They were in remarkably beautiful 

 condition, the bivalves having an unusually porcellauous aspect, and many 

 of the species presenting local peculiarities. 



Midinia carinul-ata, I)esh.,= Mactra modesta, Sloat MS. 



Doginia pouderosa. \ ery large. 



Chione jiuctifraya, Sby.,= T. Cortezi, Sloat MS. [=ffibbostda (Desh.), Rve.,= 



callona, Sby., uon Conr.l. 

 Chione auccincta, Val.,= Calif ornicnsis, Brod.,= V. crasm, Sloat MS. [^'evy 



variable in sculpture ; also, with the last, varies greatly in shape, some o.* the 



specimens being much produced, others rounded.] 

 Chione ynidia, Eiod. Passing into atnathusia, 



152 



Crepidula onyx. 



Crepidula excavata. 



(ialerus conicu*. 



Cerithium slercus muscaruui, 



Pvrazus inc-isus and var. 



Iihinoclavis geaimata. 



Cerithidea Mazatlauiea. 



Litorina fasciata. 



Litorina aspera, var, 



Oonus '■ reticulatus " (Pease). Dead. 



Conus " emarginatus " (Pease). De»d. 



Couus interruptus. 



Neverita Recxuziana. 



Poiinices bifasc-iata. 



Cancellaria urceolata. 



Cancellaria goniostoma. 



" Cypryecassis testiculus " [perhaps 



tenuis\ 

 Malea ringens. 

 Priene nodosa. 

 Oliva subangulata. 

 Oliva poi-phyria. 

 Purpura palula. 

 Purpura biserialis, 



•Purpura ostrina. [Xormal, living.] 

 Vitularia sal"brosa. 

 Monoceros lugubre, var. 

 Cerostoma monoceros. 

 Xassa tegula. 

 Siphonalia anomala. 

 Phyllonotus nigritus. 



Californian species are those marked 



