130 BULLETIN OF THE 



Gouldia cerina C. B. Adams. 



Thetis cerina C. B. Adams, Proc. Boston Soc. Nat. Hist., Jan. 1845, p. 9. 

 Gouldia cerina C. B. Adams, Cat. of Coll., p. 29, 1847. (Jamaica.) 



Charlotte Harbor, Florida, 13 fms. ; Barbados, 100 fnis. ; Station 5, 229 fms. 



Shell with nebulous fluctuating color markings, developed into distinct lines 

 on the lunule and escutcheon, purplish inside in some specimens. The liga- 

 ment is as much external as in any of the Veneridce, and cannot be said to be 

 semi-internal any more than in Saxidomus, for instance. The hinge is com- 

 posed of three diverging cardinal teeth, the middle one largest, that nearest the 

 lunule slender, and sometimes almost obsolete. A tolerably ■well-defined lat- 

 eral tooth on the lunular ( or anterior) side of the shell exists in the left valve, 

 and is received between two laminae in the opposite valve. On the opposite 

 or posterior side is a faint elongated ridge or lamina. Both tooth and lamina? 

 are distinct from the cardinal margin in this species. There is no internal liga- 

 ment. The pallial line is slightly but distinctly sinuated. The margin of the 

 shell is not crenate, and bears traces of an exceedingly thin polished and fu- 

 gacious epidermis. The outside of the valves is concentrically ridged, with 

 fine transverse stria; radiating from the umbo and obsolete toward the margin. 

 The beaks are not compressed ; the lunule is smooth. 



The mantle has a smooth edge. There are no tubes, but the edges of the 

 mantle are caught together, forming two openings like those in Gouldia minima 

 Montague, as figured by H. and A. Adams. Otherwise the two halves of the 

 mantle are wholly disunited, except on the cardinal border. 



Prof Adams' type specimen, most kindly lent by the custodian of the Am- 

 herst collection * for my examination, is of a pale yellowish brown, and much 

 resembles in form a small Astarte of the borealis type. It is very similar to 

 G. minima, and if occurring in the same region would doubtless be taken to 

 be a variety of it. Florida specimens are often prettily variegated and brightly 

 colored. 



Gouldia cubaniana D'Orbignt. 



Venus cubaniana D'Orbigny, Sa^rn, Moll. Tub., II. p. 278, PI. XXVI. figs. 44-46 

 (1846). (Cuba, Martinique, and Florida, D'Orb., loc. cil.) 



Off Sombrero, 54 fins.; Station 36, 84 fms. ; Sigsbee, off Havana, in 100, 

 119, 158, 175, and 450 tins.; Barbados, 100 fms. ; Station .">. 829 I'm-. ; Station 

 4 J, 539 fms. 



This little -lull has a similar hinge structure to Gouldia carina C. B. Adams, 

 except that the lateral tooth is much elongated and Bomewhat obsolete; the 

 sinus in the pallial line is almost invisible; the ligament is quite the same as 

 in Adams' species; the color is pale yellow or light brown, the edge is rni- 



* Profi John D. Tyler. 



