1911.] NATURAL SCIENCES OF PHILADELPHIA. 343 



Oligocene of Santo Domingo, Gabb. Also of Gatun, A. P. B. 

 This beautiful cone bears some resemblance to the longer C. cru- 

 zianus Dall from Santa Cruz, the horizon of which is uncertain. 



The single specimen from Gatun has fully two tuberculate post- 

 embryonic whorls. In the Santo Domingo types this stage is shorter, 

 and generally inconspicuous or lost by erosion. We have quoted the 

 description from Pilsbry and Johnson's MS. work on the Santo Domingo 

 Oligocene. The figures represent the type specimens from the same 

 place. 



Conus molis n. sp. PI. XXIII, fig. 1. 



A large, ponderous cone resembling C. promethus in figure, the ratio 

 of diameter to length as 1 : 1.7. 



Spire but little raised except at the center, where the early whorls 

 project in a short acute cone. Whorls about 13, the earlier 6 flat, 

 later whorls concave, spirally striate with about 5 striae between the 

 seamlike sutural margins; crossed by weak growth-lines, which are 

 not very deeply arcuate. The shoulder of the last whorl is subacute. 

 Side strongly convex below the angle, then straight, finely striate 

 spirally throughout, the lower third coarsely striate. Aperture as 

 in C. haytensis Sowb. 



Length 124, diam. 71.2 mm. 



This cone resembles C. haytensis Sowb. of Santo Domingo, but 

 differs by being longer in proportion to its width, in the plain, not 

 coronated early whorls, which form a smaller mucro, the more acute 

 shoulder, below which the side is more convex, more distinctly striated; 

 the striae at the base are more nearly equal and closer, not widely 

 spaced with smaller striae in the intervals, as they are in haytensis. 



The type is No. 5,502 coll. Princeton University, collected by 

 Ward H. Farrington, 1908. 



This species is also represented by several internal casts in the 

 Princeton and Academy Gatun collections, and there is a fine example 

 in the U. S. National Museum from Monkey Hill, near Colon. Toula 

 also mentions a cast, probably referable to the same species (Jahrb., p. 



754). 



TURRITID^J (PLEUROTOMIDiE). 

 Pleurotoma albida Perry. 



The specimens agree well with those of the Bowden beds. It is a 

 conservative species, ranging from Eocene to recent. 



