﻿XO. 2 FOSSILS FROM PANAMA AND COSTA RICA DALL 



sculptured whorls, the first with one, the second with two, the third 

 with three, the fourth with five, the fifth with seven, and the last 

 with twelve, equal, revolving threads with subequal or wider inter- 

 spaces, crossing numerous small, rather obscure axial ridges, and 

 more or less nodulous at the intersections ; sutures very distinct but 

 not channelled; upper whorls slightly flattened, last whorl rounded; 

 siphonal fasciole obscure; aperture obovate, outer lip heavily thick- 

 ened; inner lip with a marked callous deposit; both lips smooth 

 inside ; canal short, ample, nearly closed in front. Length of shell, 

 4.2; of last whorl, 2.5; max. diameter 2.2 mm. 



Station 5849. Type, U. S. Nat. Mus. 214358. 



Though small, this is a very distinct little species, looking on a 

 casual glance much like a cancellate Rissoina, The fossils are of a 

 whitish color. 



BITTIUM PANAMENSE, new species 



Shell small, slender, dark brown, with deep sutures and six or 

 more very rounded whorls ; nucleus absent, subsequent whorls with 

 an exclusively spiral sculpture consisting of very fine, spiral, regu- 

 larly minutely beaded threads separated by wider interspaces which 

 are filled by two or three still finer, simple, closely adjacent threads ; 

 there are seven or eight of the beaded threads on the last whorl. 

 Aperture rounded, the outer lip flaring, hardly thickened; inner lip 

 with a wash of enamel, both smooth, with no posterior sinus ; canal 

 short, slightly recurved. Length of shell 7.5, of last whorl 3.50; 

 max. diameter 3.0 mm. 



Station 5850. Types, U. S. Nat. Mus. 214359. 



There is no known recent species of the region with which this 

 can easily be confused. 



TEINOSTOMA (PSEUDOROTELLA) GOETHALSI, new species 



Shell small, depressed-turbinate, whitish, of about three whorls, 

 with closely appressed suture, nucleus minute, smooth ; last whorl 

 spirally sculptured with two strong grooves at the shoulder, between 

 which are two closely adjacent threads which are sometimes con- 

 densed into one prominent thread ; marginating the base is another 

 conspicuous groove with a prominent thread behind it ; the peripheral 

 space between this thread and the anterior groove at the shoulder 

 is cut by five or six sharp, subequally distant striae; in front of the 

 marginating basal groove are one or two adjacent spiral threads ; 

 the space between the suture and the posterior shoulder groove, the 

 peripheral space, and the base outside the umbilical callus, are 



