Descriptions of Caribbean Miocene Fossils. ^\M. 4^xyp> f ^fY 



By William M. Gabb* 



I USE the term Caribbean in preference to a more restricted one, since I have 

 not only my own collections from Costa Rica, but there are also in the museum 

 of the Academy of Natural Sciences of Philadelphia a few fossils collected by 

 Dr. Newberry at Gatun, on the Panama Railroad, which I include here, as well 

 as occasional notes on West Indian species. 



NAUTILUS, Breyn. 



A very imperfect cast of an unrecognized species, about six inches in diameter, 

 in the above-mentioned collection of Dr. Newberry. 



STTLIOLA, Lesueur. 

 S. BicosTATA, Gabb, n, s., PI. 44, fig. 1. 



Shell minute, apical angle broad, aperture elliptical, the longest diameter being 

 transverse, each side bearing a very faint ridge. No other ornaments. The apex, 

 instead of being compressed in the same direction as the mouth, is markedly com- 

 pressed at a right angle to that direction. 



Figure. Magnified 6| times linear. 



Locality. Sapote, on the Reventazon River, Costa Rica. Very rare. Differs 

 from its Dominican congener [S. sulcifera) in the absence of the groove and in 

 its having its apex and mouth both elliptical, but placed in opposite directions. 



DRILLIA, Gray. 



D. MILITARIS, Hds. 



Pleurotoma consors, Sby., Guppy. 



For details of synonymy see Memoir on Santo Domingo. 



Mr. Guppy {Quart. Journ. Geol. Society, 1876, p. 527) repeats his dissent from 

 my determination. I did not arrive at it without careful study of large numbers 



* This and the following paper were written by the late Mr. Gabb whilst in San Domingo, during the 

 winter of 1877-78. He returned to Philadelphia too ill to make some necessary references to books and speci- 

 mens in the Academy of Natural Sciences, and a few hours before his death he committed his material to my 

 hands with the request that I would edit it. This I have done to the best of my ability, but from want of 

 knowledge of the subject, I have necessarily refrained from pursuing a number of lines of inquiry which Mr. 

 Gabb had noted as requiring his further investigation. Geo. W. Tryon, Jr. 



71 (337) 



