226 Bulletin 29 390 



tion. The shell is broadly ovate, slightly produced in form, or- 

 namented by three diverse sets of impressed lines. The first con- 

 sists of a series of parallel sharply ridged, undulating, or ziczac 

 lines with a general concentric trend ; the second which decorates 

 the center of the valve consists of steeply oblique, parallel im- 

 pressed lines ; the third set which covers the produced portion 

 of the valve consists of fine, distinct striae which are concentric 

 near the dorsal margin of the shell but suddenly alter their direc- 

 tion so as to be nearly vertical. Length 16, approximate altitude 

 14, semidiameter 3 mm. 



Locality — (Exp'd '16) Zone H, Rio Cana at Caimito. 



Genus Mbtis H. and A. Adams 



Metis trinitaria Dall 



Metis trinitaria Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 5, pp. 1041, 



pi. 46, fig. 24, 1900. 

 Cf. Tel Una biplicata Guppy, Quart. Jour. Geol. Soc. London, vol. 32, 

 p. 530, 1876. Not of Conrad. 



Probably the shell in the Heneken collection referred by 

 Guppy to T. biplicata should be classed as this species. We did 

 not collect any shells of this type but they are to be looked for 

 in Dominican collections. The species is reported by Dall from 

 the Caroni series of Trinidad and near Santiago de Cuba. . It is 

 recognized by its rounded, produced anterior end and very short, 

 sharply folded posterior end. Length 52, altitude 41, diameter 

 19, but it may attain twice these measurements. 



Genus Macoma Leach 

 Macoma cf. constricta Bruguiere 



Solen constrictus Bruguiere, Mem. Soc. Hist. Nat., vol. 1, p. 126, no. 3, 



1799. 

 Tellina {Macoma') constricta Gabb, Trans. Amer. Phil. Soc, vol. 15, 



p. 249, 1873. 

 Macoma constricta Dall, Trans. Wagner Inst., vol. 3, pt. 5, p. 1050, 



1900. 



We collected a fragmentary fossil shell, probably similar to 

 that which Gabb obtained and referred to M. constricta. Our 



