326 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



trace of a fourth may be seen. A complete shell should have about 

 9 whorls. 



The embryonic shell consists of 1| smooth convex whorls, the 

 summit a little obtuse. 



Length 24, cliam. 9.1, length of aperture 13 mm. 



This species differs from Borsonia, as defined byM. Cossmann, 

 by the large upper plait high on the columella, and the sinus at the 

 shoulder, terminating an elevated anal fasciole; the sculpture other- 

 wise much as in Scohinella. We propose for it the new subgenus 

 Paraborsonia. 



Rouaultia has the sinus in the same situation, but it differs widely 

 in other characters. 



Borsonia recurvirostris Gabb. Plate XVIII, fig. 2. 



Borsonia recurvirostris Gabb, Tr. Am. Philos. Soc, xv, 1873, p. 210. 



There are fourteen nodes on the periphery of the last whorl, below 

 which are numerous, strongly unequal spiral cords and threads. On 

 the whorls of the spire only three spirals are visible, the upper one 

 being peripheral. Between the concave anal fasciole and the suture 

 there is a prominent spiral ridge. The single columellar plait is 

 strong and but little oblique. 



Length 9.6, diam. 3.9 mm.; 85 whorls. 



It probably belongs to the subgenus Borsonella Dall, though the 

 sculpture is rather diverse. 



The type is no. 2912 A. N. S. P. 



CONIDAE. 



Conus haytensis Sowerby. Plate XIX, fig. 1. 



Conus haytensis Sowb., Quart. Journ. Geol. Soc. vi. 1849, p. 44. 



Conus haitensis Sowb., Gabb, Tr. Amer. Philos. Soc. xv,1872,p. 231 (in part). 



The largest species of the genus in the Santo Domingan formation * 

 The spire is conspicuously striated spirally; also the anterior part 

 of the last whorl. These striae are not granulous. The base is 

 less contracted than in C. domingensis. 



Length 107, diam. 65 mm. (Fig. 1). 



Length 91, diam. 55 mm. 



Length 85, diam. 58 mm. 



In some specimens the spire is very low or almost flat except for 

 a central mucro. 



Length 61.5, diam. 44 mm. 



Length 54, diam. 32.5 mm. 



