24 AMERICAN JOUENAL 



surface covered with flat ribs, separated by narrow, shallow sulci. 

 White, with brownish, longitudinal, pencilled rays. Teeth white, 

 prominent ; interior surface white and polished ; margin strongly 

 denticulated ; the interstices between the denticulations. on the 

 posterior margin dark brown. 



Dimensions. — Length 19, width 28 mill. 



Eah.—'i 



Observations. — I cannot approximate this species to any hith- 

 erto publiched. It seems peculiar in its strong denticulations 

 and color. The only specimen which I have seen is in the 

 Academy's collection. It is somewhat worn, but when fresh, the 

 species must be beautiful in appearance. 



9. Tellina {Peroncea) Conradi, Tryon. — Plate 1, fig. 5. 



Description. — Ovate, somewhat inequilateral, rounded in front, 

 obtusely wedge-shaped and flexuose behind ; one valve convex, 

 smooth, polished ; the other not so convex, crowded with oblique 

 fine lines ; dorsal margins somewhat convex, sloping; ventral 

 margin convex before, slightly concave behind. Rose color in- 

 side and outside. 



Dimensions. — Length 16, width 25 mill. 

 Hah.—t 



Observations. — This species has been hitherto confounded with 

 T. dispar, Conrad. It differs from that species in color and in 

 form, being more produced and flexuose posteriorly. Sowerby's 

 figures, 113, 114 (Thes. Conch, i.), included by him in dispar, 

 represent this species. 



10. Strigilla producta, Tryon. — Plate 1, fig. 4. 



Description. — Shell solid, subglobose, anteriorly rounded, pos- 

 teriorly produced, obliquely finely striated, glossy white, cen- 

 trally covered with a large, rose-colored spot outside and inside. 



Dimensions. — Length 6-5, width 8 mill. 



Hab. — Ins. Jamaica. 



Observations. — This species has been confounded hitherto with 

 the common West Indian form, S. pisifo7-mis, which it strongly 

 resembles, but may be readily distinguished by its much more 

 produced posterior side. 



