338 DESCRIPTIONS OF CARIBBEAN MIOCENE FOSSILS. 



of specimens, and repeat my conviction of the identity of the species. Found 

 very rare, but perfectly recognizable, at Sapote, on the Reventazon River. 



PHOS, Montfort. 



P. INORNATA, Gabb, n. s., PI. 44, fig. 2. 



Shell moderately large, robust, a little variable in the height of the spire, but 

 -with the spire and aperture of approximately equal lengths. Whorls, including 

 the nucleus, about eight or nine. All of my specimens are so broken at the 

 extreme apex as to make about two very small volutions possible, and the speci- 

 men figured thus broken retains seven. Suture linear, not very strongly marked; 

 volutions slightly angulated, and sloping steeply from the suture. Whorls marked 

 by not very strong longitudinal ribs, which develop into angular tubercles on the 

 back of the body whorl. These are crossed in some specimens by a few hair-like, 

 revolving, elevated lines, most strongly marked on the upper volutions. In other 

 examples these lines are only detected by a glass, or are entirely absent. 



Figure. Natural size. 



OLIVA, Brug. 

 O. ISPIDULA, Linn. 



Found at Sapote, on the Reventazon River. 



MALEA, Val. 



M. KINGENS, Wood. 



Although I have not found this species fossil on the main land, Mr. Conrad 

 reported it from Gatun on the Isthmus, among the collections of the Pacific Rail- 

 road party. See Report P. R. R. Exp., v. 6, p. 72, pi. 5, f. 22. 



NATICA, Lam. 



K MiLLERi, Gabb, n. s., PI. 44, fig. 3. 



Shell small, flattened subglobular ; apex elevated ; suture well marked, but not 

 indented or grooved ; aperture broad ; the thickening of the inner lip not very 

 heavy; umbilical callus small, but well marked, and running spirally up the rather 

 narrow umbilicus. Whorls five and a half; surface smooth. 



Figure. Nearly twice natural size. 



Locality. Sapote ; found for me by Mr. Silvanus Miller, the engineer in charge 

 of that section of the Costa Rican Railroad, and a gentleman to whom I am 

 indebted for many similar favors, both in palseontology and in archaeology. 



Of previously described species, this resembles most in its form Lunatia semi- 

 lunata, Lea, of the Eocene of Claiborne, Alabama, but it is flatter than that, and 

 the umbilicus is smaller. 



