ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 279 



Name. 



Lucina tellinoides, Rve. 

 Capsa altior, Sow 



Donax assimilis, Hani. 



gracilis, Hani. 



navicula, Hani. 



rostratus, n. s 



Tellina ? aurora, Hani. 



— cognata, n. s 



One valve, "closely allied to 



the Caribbaean T. sirnilis." 



— Columbiensis, Hani. ... 



concinna, n. s. 



crystallina, Chemn 



Cumingii, Hani 



Dombei, Hani 



felix, Hani. [?] 



[Prof.Adams' shell is said by 



Dr.Gld.tobehisASYW^7/a/Mca/a.] 



laceridens, Hani. 



prora, Hani. 



puella, n. s 



rubescens, Hani. 



siliqua, n. s 



simulans, n. s 



[=T.punicea, Hard. Species 

 constituted from a single 

 valve to include the Pacific 

 specimens of the W. Indian 

 form.] 



sincera, Hani 



vicma, n. s 



, sp. a, like elongata 



, sp. b 



, sp. c 



Petricola cognata, n. s 



[} = P.pholadiformis, Gld. MS.] 



Saxicava ? tenuis, Sow 



[? = #. pholadis, Linn, var.] 



Cumingia coarctata, Sow 



trigonularis, Sow 



, sp. a 



,sp. b 



, sp. c 



, sp. d 



Prof. Adams regards the above 

 as " probably new species: but 

 as their characters dire probably 

 somewhat variable," prudently 

 forebore from describing them 

 without more specimens. They 

 are probably varieties ; as Cu- 

 mingia, like other nestlers, are 

 most variable in form and 

 sculpture. 



Araphidesma bicolor, n. s 



? ellipticum, Sow 



proximum, n. s 



[ = Semele pr oxima, M. Cum. \>&rs : 

 pars = S. proximo,, B.M. Maz. 

 Cat.p. 28, = S.flavicans, Gld.] 



Station. 



buried in sand, 1. w. 

 a few inches in sd.,f -t 



soft stone, i-t. 



No. of 

 Speci- 

 mens. 



Other Localities. 



30 

 3 



350 

 20 



3 



1 



3 

 I v. 



2 

 3 



I v. 

 2 

 12 



36 v. 



7 

 1 v. 

 12 v. 



2 



1 

 lv. 



15 

 10 



1 v. 



lv. 



bv. 

 1 



4 

 3 

 4 

 1 



lv. 



I 



20 

 18 



Is. Muerte, sandy mud, 1 1 fm. Cum. 

 G. Nicoya, coarse gravel, 12 fm., Cum. 



Var., mud, 5 fm., Tumbez, Cum. 

 Mazatlan, Green. 



B. Caraccas, Guay., Chiriqui, Cum. 

 Nicoya, Cum. 



Maz., Green; Sta. Barb., Jewett. 

 softsandvm.,10fm.,CMm. ; Rio Janeiro 

 [Jay. 



Monte Christi, sandy mud, 12 fm. ,Cum 



St. Elena, Hani. 

 Guacomayo, coral sand, Cum. 

 sandy mud, 12 fm., Cum. 

 sandy mud, 6-10 fm., Cum. 



sdy.m.,3-5fm.,Tumbez&Chiriqui,Cwm 

 sdy.m.,6-9fm.,St.Elen.&Salango,Cwm 



sandy mud, Tumbez, Cum. 



" Closely allied to T. bimaadata." 



Guaymas. 



Pascomayo and Lambeyeque, Cum. 



Caraccas, sandy mud, 7 fm., Cum. 

 St. Elena, stones, deep water, Cum. 



Monte Christi, 9 fm., sandy mud, Cum 



