1917.] NATURAL SCIENCES OF PHILADELPHIA. 33 



below the shoulder is but slightly convex. The spire is quite low, 

 rising very little above the posterior level of the outer lip. The lip 

 is not very broad, moderately thick, with a slight ledge behind; its 

 inner edge bears about 16 small, unequal teeth. The four columellar 

 folds are about equal, the lower ones being more oblique than in 

 M. latissima, and not so strong. 



Length 13.7, diameter 8.7 mm. 



There is also a fragment of a much larger Marginella, not deter- 

 minable. 



Oliva sayana immortua n. subsp. PI. 5, fig. 6. 



The shell differs from the recent 0. sayana (litterata) by being 

 smaller, less broad at the base, the sutural channel broader and deeper, 

 and the ledge which encircles the shell above the siphonal fasciole 

 is closer to the upper siphonal plait at the edge of the apertural 

 callus. The outer lip is well thickened, indicating maturity. 



Length 41, greatest diameter 18.4 mm. 



Three other specimens are somewhat smaller, but show the same 

 ■characters. 



•Strombina cartagenensis n. sp. PI. .5, fig. 3. 



The shell is fusiform with a rather -long spire of 7| whorls; the 

 earlier ones worn, the later having sculpture of rather narrow, very 

 slightly curved longitudinal ribs, crossed by a group of about 7 

 inconspicuous spirals in the upper part, and strongly developed spiral 

 cords about as wide as their intervals on the lower half of the last 

 whorl, about 18 in number. The longitudinal ribs, of which there 

 are 12 on the penultimate whorl, become shorter on the back of the 

 last whorl, where they scarcely extend to the middle. There is a 

 very thick and high varix behind the outer lip. The aperture is 

 about three-fifths the length of the shell, narrow; outer lip heavily 

 calloused, the callus bearing about 10 teeth. The columellar lip 

 forms a thin, raised ledge. 



Length 26.8, diameter 11.3 mm.; length of aperture 15.2 mm. 



This species differs from the Panamic and Santo Domingan forms 

 by its rounded periphery, without dorsal or ventral humps. 



Strombina lloydsmithi n. sp. PI. 5, fig. i. 



The shell is quite small, with the greatest width about at the 

 anterior third of the length. Whorls 9, the first three convex, 

 forming the smooth embrj'onic shell. The remaining whorls of the 

 spire are flat, sculptured with straight longitudinal ribs about equal 

 to their intervals, faint traces of two or three impressed spiral lines 

 3 



