' OF SANTO DOMINGO. ' 249 



T. (P.)minuta. Gabb, ii. s. 



Shell small, sub-oval ; beaks central ; anterior end and base broadly rounded ; base sloping up behind very slightly- 

 sinuous ; posterior margin arched and uniting with the base by an angle ; surface polished, convex and without a pos- 

 terior ridge ; hinges with two strong lateral teeth iu right valve ; none in the left; primary teeth small. 



About half the size of T. Guadalapensis, very much rounder and without the 

 posterior ridge of tliat species. 



T. (Mosra) cuneata. D'Orb., La Sagra, pi. 26, fig. 21-23. . - 



T. (Arcopagia) f austa. Donov., Vol. III., pi. 98. ' . » . . 



T. (Macoma) c o n str ic ta. Brug., Mem. Soc, N. II., 1792, p. 126. ■ •■, . i. ' ,,' 



Living from U- S. to Brazil. • - . 



STRIGILLA. Turtou. , , 



S. pisiformis. Linn., sp. 



Tellina, id. Linn., Syst. Nat., p. 1120. . ■ 



Living ill the West Indies. 



TELLIDORA. Morch. 



T. crystallina. Chemn., sp. ' ■ ■ 



Tellina, id. Chemn., Vol. XL, 210, fig. 1947, 1948. ■■ . , ' .,- ■ 



Living in tlie Panama province. ■ • ' . 



DON AX. Linn. 



D. 86 qu alls. Gabb, n. s. 



Shell small, triangulai', beaks central, the two sides sloping equally to the ends ; base broadly and evenly convex ; 

 truncation of the anterior end broad, bordered by a rounded angle ; surface polished, obsoletcly sculptured by radia- 

 ting lines ; inner margin of base and anterior end crenulated, the teeth on the basal margin being larger than those 

 above. Length .25 inch, width .2 inch. 



A single valve still more regularly triangular that the larger Z). deltoides. Its 

 central beaks will distinguish it from all known species. 



■• VENUS. Linn. 



V. magnifica. Hanley, Thes. Conch., Venus, p. 704, pi. 153, fig. 5. 



I have compared my fossils with authentic recent specimens of the Philippine 

 Island shell, and can find no difference between them. 



CHIONE. Megerle. 



w 



C. pap^ia. Linn., s^)., Syst. Nat., p. 1129. 

 C. G u p p y a n a . Gixbb, n. s. 



Shell sub-circulai-, swollen beaks anterior, base and extremities regularly rounded ; posterior cardinal margin 

 arched and bordered by a narrow flat space ; lunule surrounded by an impressed groove ; surface sculptured by 

 numerous equal radiating ribs, crossed by rather closely placed concentric waved lamelte. 



The form of this shell is nearest to V. toreuma. In its sculpture it resembles C. 

 Wcdli, and C. Woodwardi of Gnppy, but can be at once distinguished from them by 

 its round form. 



A. r. s. — VOL. XV. 3k. 



