204 OK THE TOPOCJliAPHY AND GEOLOGY 



With the same general surface ornaments and the same number ©1' whorls and 

 varices, the shell has a very much lower sj^ire and the body whorl is a third wider 

 than Sowerby's siDecies. The great variety of both species prevents a comparison of 

 a series, but I can hardly believe, despite their similarity in some respects, that two 

 shells of such different form can be specifically' related. T. alatus is a long slender 

 fusiform shell, with a long straight canal and a slender spire. At the same time the 

 resemblance in the ornaments, number of the varices, and of the whorls, and in size 

 render it possible that they are only varieties of one species. My only specimen of T. 

 alatus has not the aperture perfect, so in that respect I am compelled to use Sowerby's 

 figure for comparison. The mouth of my ohesus is much moi-e elongated than 

 Sowerby makes it, and it is sub-angulated instead of being round in advance. 



FUSUS. Lam. , ' 



F. II e 11 e k e n i. Sby. Quart. Jour. Vol. VI. p. 49. :^ 



Common. 



F. q u a d r a t u s. Gabb, n. s. 



Shell very small, elongate-fusiform, spire nearly twice as long as the apertui-e ; whorls eight, the first two, 

 nuclear, round and plain ; the next three bearing a number of tubercles which diminishes on each succeeding whorl; 

 Buture linear, impressed ; body whorl most prominent in the middle, sloping up with but slightly converging sides 

 to the suture. C'anal short, broad. Aperture broad, columella slightly curved, outer lip simple. Surface of the 

 body whorl marked by four very large rounded longitudinal ribs, with neai-ly flat interspaces, making an irregular 

 quadrangular prism. On the next two whorls the ribs, which are not perfectly coincident from one volution across 

 the suture to the other, become more numerous, so that in the middle of the spire there are five, and still further up, 

 On the first ornamented whorl below the nucleus, there are eight or nine little tubercles. Length .35 inch, width 

 about .15 inch. 



This peculiar little shell, of which I have seen but a single specimen, has some- 

 what the surface characters of Mangelia, but its straight lines of growth show that 

 it cannot belong to that family. It is a Fusus in all of its characters excej^t its 

 unusually short canaL 



F. Haitensis. Sby. Quart. .Jour. Vol. Vl. p. 49. 



Among the many thousands of shells collected I have found nothing correspond- 

 ing with the above quoted description. May it not be only an individual variation 



F. Henekenif ■ 



«• ■ 



HEMIFfSUS. Swains. ■. 



H. An till a rum. Gabb, n. s. 



Shell short fusiform, moderately broad ; spire about half as high as the length of the aperture ; whorls eight, 

 angulated, sloping, and slightly concave on the upper surface, bearing about ten rounded nodes on the angle, slightly 

 convex below ; suture impressed. Surface ornamented by numerous revolving lines. Aperture broad ; outer lip 

 internally striate ; canal moderately produced, slightly twisted. Length about four inches. 



Allied to //. colosseus, Lam., but proportionally broader, with a lower spire, less 

 sloping on the shoulder of the whorl, and the nodes are larger and rounder. 



