166 Description of some 



the ribs already mentioned. Aperture ovate, elongate, extending 

 downwards into an open canal ; the exterior ribs and folds plainly 

 visible within. When mature the right lip is slightly thickened in- 

 to a varix. The columella shows upon its upper part the trans- 

 verse ridges of the shell, the lower portion is smooth and some- 

 what twisted ; a slight umbilical trace is seen where the pillar lip 

 is applied to the base of the shell : length, 4.25 inches, breadth, 2 

 inches. 



Habitat, Straits of St. Juan de Fuca, Oregon. 



Remarks.— I am indebted to the kindness of Dr. Budd, for the 

 opportunity of describing this curious shell. In form it resembles 

 the Fusus antiquus (Lin.) Lam. It is very nearly allied to T. can- 

 cellalum, Lam., and to T. scabrum, King, but it is readily distin- 

 guished from the former, by the absence of the elevated tooth or 

 ridge which is found upon the upper portion of the columella in 

 that species, while from the T. scabrum it is distinguished by its 

 greater size, its elongation, the rounded character of its whorls, its 

 longer canal, and its more prominent cancellation. Its varices also, 

 though not very prominent, arc more so than in cither of the species 

 just mentioned. 



Ranella Tiiersites. Plate X. fig. 6, a.b.—My Cabinet— Cabi- 

 nets of Dr. B. W. Budd, C. M. Wheatley and N. B. Wilbur. 



Testa ovata, gibbosa, albido-lutescente, tuberculata et transver- 

 sim sulcata ; tuberculis elevatis, acutis, compressis, interdum distor- 

 tis ; varicibus transverse rugosis, ad suturas canali instructis; aper- 

 tura flava, utraque extremitate canaliculata ; margine dentato, in- 

 crassato ; columella rugosa. 



Shell ovate, gibbous, composed of about seven whorls. The 

 upper whorls are angular at the middle and furnished at the angle 

 with a series of elevated, horizontally compressed, pointed tuber- 

 cles. These becomo quite large upon the last whorl and show an 

 inclination to distortion. The spire usually has three of these tu- 

 bercles between each varix, but on the back of the last whorl, the 

 number varies from one to three, one of the tubercles being some- 



