ON MOLLUSCA OP THE WEST COAST OF NORTH AMERICA. 279 



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. similis." 



— Columbiensis, Hani. .. 



— concinna, n. s 



— crystallina, Chemn 



— Cumingii, //(zwi 



— Dombei, Hani. 



felix, //an/. [?] 



[Prof.Adams' shell is said by 

 Dr.Gld.tobehis5'/rJ5't7to/«ea<a.] 

 laceridens, Hani. 



— prora, Hani, 



— puella, n. s 



— rubescens, Hani. 



— siliqua, n. s 



— sitnulans, n. s 



[ = T. punicea, Hani. Species 



constituted from a single 



valve to include the Pacific 



specimens of the W. Indian 



form.] 

 sinceia, Hani. 



vicina, n. s 



, sp. a, like elongata 



sp. b 



sp. c 



Petricola cognata, n. s 



{'> = P. pholadiformis, Gld. MS.] 



Saxicava .'tenuis. Sow 



[} = S. pholadis, Linn, var.] 



Cumingia coarctata. Sow 



trigonularis. Sow 



, sp. a 



, sp. b 



, sp. d 



Prof. Adams regards the above 

 as " probably new species: but 

 as their characters axeprobably 

 somewhat variable," prudently 

 forebore from describing them 

 vyithout more specimens. They 

 are probably varieties ; as Cu- 

 mingice, Uke other nestlers, are 

 most variable in form and 

 sculpture. 



Amphidesma bicolor, n. s 



? ellipticum. Sow 



proximum, n. s 



[ = Semeleproxima,M-Cum.pairs 

 pa.rs = S. proxima, B.M. Maz 

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



buried in sand, 1. w. 

 a few inches in sd.,f -t. 



soft stone, ^^-t. 



No. of 

 Speci- 

 mens. 



30 

 3 



350 

 20 



3 



1 



3 

 \v. 



2 



3 

 Iv. 



2 



12 

 36 ». 



7 

 \v. 

 \2v. 



2 



1 

 \v. 



15 

 10 

 \v. 

 \v. 

 5 V. 



1 



4 

 3 

 4 

 1 



\v. 

 \ 



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. 

 soft sandy m., 10 fm.,CM>n.; Rio Janeiro 

 [Jay. 



Monte Christi, sandy mud, 12 fai.,Cum. 



St. Elena, Hani. 

 Guacomayo, coral sand. Cum. 

 sandy mud, 12 fm.. Cum. 

 sandy mud, 6-10 fm.. Cum. 



sdy.m.,3-5 fm. ,Tumbez&Chiriqui,C«»j. 

 sdy.m.,6-9fm.,St.Elen.&Salango,Cj«w 



sandy mud, Tumbez, Cum. 



other Localities. 



" Closely allied to T. bimaculata." 



Guaymas. 



Pascomayo and Lambeyeque, Cum. 



Caraccas, sandy mud, 7 fm.. Cum, 

 St. Elena, stones, deep water. Cum. 



Monte Christi, 9 fm., sandy mud, Cum 



I 



