342 DESCRIPTIONS OF CARIBBEAN MIOCENE FOSSILS. 



Finally, altilirata has a very slightly broader angle, but this might readily be ac- 

 counted for by the difference in size, a variation not rare in very elongate shells. 



T. GrATUNENSis, Conrad, PI. 44, fig. 10, 10a. 



id., Con., Pacific R. R. Report, vol. 6, p. 72, PL 5, fig. 20. 



It is remarkable that M^ith the two representative species just quoted, we should 

 have them accompanied by another pair. T. tornata and T. altilirata are so 

 closely allied that they may be safely referred to an intermediate common source. 

 T. Gatunensis is a round-whorled shell with three or four large and numerous 

 finer ribs, and so is T. planigyrata. 



Figures, Natural size. 



Locality. The specimens figured were found by me in the deep canon of 

 Oronli Creek, a tributary of the upper part of the Uren river, near the base of 

 Pico Blanco, in Talamanca. It was originally described from Gatun, on the 

 Panama K. E,., and there are specimens in the Academy's collection from that 

 locality, from Dr. Newberry. 



TROCHITA, Schem. 

 T. CoLLiNSii, Gabb, ii. s., PI. 44, fig. 11, 11a. 



Shell small, inconspicuous, conical, apical angle very variable, usually rather low, 

 shell often oblique or crooked. Surface unornamented. Apical volutions one- 

 and-a-half, minute, but distinct. Internal plate thick. 



Largest specimen, fig. 11a, 5 mm. in diameter. 



Locality. Sapote, Costa B,ica. » 



Named after Mr. Wm. P. Collins, my topographical assistant in the explora- 

 tion of Talamanca. 



KUPHIJS, Guett. 



K. INCRASSATTJS, Gabb, PI. 44, fig. 12a-e. 



id.., G., Memoir on Sto. Domingo, Tr. Amer. Philosoph. Soc, v. 15. 



I quoted this species originally as from only one known locality. Since then 

 I have found it in nearly the whole range of the Samba hills, and south of Samana 

 Bay, in Santo Domingo, a very common and characteristic fossil of the upper part 

 of the Dominican Miocene. Besides, I was fortunate enough to find one small 

 fragment at Sapote, Costa Hica ; and so perfect and characteristic is it that no 

 more is necessary. It is figured. at 12e, all the others being from Santo Domingo. 

 All the figures except the first are actual size ; that is one-third natural size, though 

 I have seen still larger. The shell substance of the tube is so thick and invariably 

 crystalline that long fragments are very rare, and I have never been able to find 

 the valves. 



