ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 361 



American Localities. 



No. 



Species. 



Station. 



Pacific Localities. 



G. 



C.A. 



P. 





74 



Lathyrus ceratus, Wood 



u. s. & rocks, 1. w. 







C.A. 







75 

 76 



tuberculatus, Brod 



varicosus, Rve 



under stones, 

 crevices of rocks. 













77 





sandy mud, 6 fm. 



coral sand, 7 fm. 



10 fm. 



Marquesas. 









78 

 79 



gratiosa, Rve 









M. 





P. 



S.A. 



80 



Strigatella tristis, Swains 



6-10 fms., sandy 

 mud : also u. s. 1. w. 







f) A 







81 





sandy mud, 12 fm. 











S.A. 



82 



Olivella Kaleontina, Duel. 





M 



C, A 







83 









M. 

 M. 



C.A. 



P. 





84 

 85 



columellaris, Lam 



exposed rocks, 1. w. 

 under stones, 1. w. 





— — triangularis ( = Carolensis, 













Rve.), Blainv. 







M. 



C.A. 



P. 





86 

 87 





exposed rocks. 





Vitularia salebrosa, King. 











88 



Monoceros grandis, Gray 



crev. rocks, 1. w. 









P 





89 













P. 





90 



Reeviana = pulchrum,i<!fle. 



under stones, 1. w. 









P. 

 P. 

 P. 





91 

 92 

 93 





under stones. 

 under stones. 







crocostoma, Rve. 







P. 





94 

 95 





under stones, 1. w. 

 under stones. 





Columbella haemastoma, Sow... 











96 



varians, Sow. 















97 



unicolor, Sow. 















98 



?Buccinum biliratum, Rve. 















99 



pulcbrum, Rve. [? = En- 



gina Reeviana.] 











P. 





100 

 101 

 102 



Nassa nodifera, Pow 



angulifera, A. Ad. 



nodocincta, A. Ad. 



coral sand, 6-10 fm. 





?G. 



C.A. 









103 



Fusus Dupetithouarsi, Kien. 











P. 





104 



Anachis atramentaria, Sow 



under stones, 1. w. 









P. 





105 

 106 



nigricans, Sow 



rugulosa, Sow. 



u. s., $-t.— 1. w. 









P. 





107 

 108 

 109 



Strombina bicanalifera, Sow — 



sandy mud, 10 fms. 



coral sand, 6-8 fm. 



under stones. 





Pisania cinis, Rve 











110 









25 



22 



38 



11 



111 





coral sand, 8 fms. 



11 species. 





This list (which is believed to be very accurate in all respects except 

 Modiola copax, which is not included in the analysis) contains 20 land 

 and freshwater shells, all of which are believed to be peculiar to the islands, 

 except a Helix found at Tahiti, and a small Paludina, common to Tahiti, 

 and Van Diemen's Land {Darwin). Of the 90 marine shells analysed by- 

 Darwin, 47 were not known elsewhere; 25 inhabited the West coast of 

 America, 8 being distinguishable as varieties; the remaining 18 having been 

 found by Mr. Cuming in the Low Archipelago, and some of them also at 

 the Philippines. Prof. Forbes, speaking of the Galapagos in the 'Mem. 

 Geol. Soc. Gr. Br.' vol. i. p. 402, note, says, "We have distinct systems of 

 creatures related to those of the nearest land by representation or affinity, 

 and not by identity." The latter word does not hold good of the sea shells; 

 for there are already known 111 species at the Galapagos, of which 55, or 

 nearly one half, are American shells ; of these 25 inhabit the Gulf; 22 

 have already been taken in Central America; 38 are found at Panama; but 

 only 1 1 from the parallel latitudes in South America. Only 4 bivalves are 



