CYRENA. Panamna Shells. 275 



449. Artemis saccata. 



Synonymy, 



Arthemis saecata Gould in Proc. Boat. Spc. Nat. Hist. p. 91. Nqv, 18$1. 



Station. — Unknown. 



Hahitat. — Mazatlan ; Lt. Green I Gould. 



Panama ; 0. B. A. I 

 2 specimens were obtained; 



450. Gouldia PaciJica. Nor. sp. 



Shell subtriangular, but with the ventral margin well 

 excurved : the color varying in different specimens from dingy 

 white to pale brown, often tinged with red about the beaks, 

 with some narrow rays of brown, and rarely with short irregu- 

 lar lines of brown ; with eight to twelve stout subequal concen- 

 tric ridges : sometimes radiately striated : beaks very acute and 

 closely approximate-: posterior area moderately depressed: 

 lunule defined by a well impressed line, rising at the margin of 

 the valves : margin of the interior not crenulate. It is closely 

 allied to Q. parva Ad. 



Length .22 inch ; height .19 inch ; breadth .09 inch. 



Station. — Unknown, 



Hdbitat. — Panama ; C. B. A. I 



We collected 4 entire shells and 60 odd valves. 



451, Cyrena maritima. Nov. sp. 



Shell subtriangular, but with the ventral margin well 

 excurved, ventricose, thin: dingy white, more or less viola- 

 ceous in the posterior half: with an olivaceous coarsely striate 

 epidermis : with well impressed striae of growth : beaks very 

 prominent, approximate: umbones very prominent: with fi 

 prominent posterior angle, and another less developed post^irior 



