FAMILY PURPURID.E FUSUS. 147 



FuSUS IMBRICATUS. 

 PLATE IX. FIG. 188. 



Description. Shell elongate, robust. Whorls five ; the apicial one smooth, polished, very 

 acute ; suture distinct. Whorls with equal equidistant vertical folds, crossed by alternately 

 larger and smaller revolving lines, which are also distinct in the intervening spaces : these 

 lines are most prominent and cancellate on the lower part of the body-whorl. Lip curved 

 inward above, and crenate on the whole margin by the revolving lines ; on the beak, these 

 revolving lines become obliquely ascending, or nearly vertical. Canal nearly straight, patu- 

 lous, broadly emarginate at base. 



Color. Ashen grey ; columella dark olive ; lip yellowish within. 



Length, 0-55; of aperture, - 3. 



Obtained by dredging in the harbor of New-York. It has the general configuration of F. 

 einereus, with which it is usually associated : it differs mainly in the form of the aperture, 

 and the development of the revolving lines. 



FUSUS PYRULOIDES. 

 PLATE IX. PIG. 191. 



Description. Shell solid, ventricose, turreted. Spire pointed, moderately elevated. Whorls 

 seven ; the two upper ones smooth : body-whorl with its upper fifth portion vertically 

 depressed, obliquely flattened. The whole surface covered with alternate large and small 

 revolving ribs, undulated by their decussation with smaller vertical raised lines. Upper whorls 

 with a vertical and flattened portion resembling the body-whorl ; along the carinated edge of 

 the body-whorl, a series of small tubercles. Aperture oblong-oval, narrowed beneath, ending 

 beneath in a very short canal, and more than two-thirds of the total length. Lip thin, some- 

 what inflated, rendered waving by about thirty distinct robust revolving ribs within the 

 aperture, which descend obliquely beneath until they become nearly vertical ; some of these 

 ribs become duplicated near the outer margin : pillar-lip with an oblique inconspicuous fold. 

 Opercle horny, irregularly subovate. 



Color. Epidermis ashen brown ; upper portion of the columella bluish, beneath wax-yellow ; 

 interior of the aperture, polished umber-brown ; ribs near the base of the aperture, white. 



Length, 0'95; of aperture, 0'7. 



This shell was found attached to the bottom of a vessel in the harbor of New- York, believed 



to have arrived from a southern port. I have given it a name indicating its resemblance to 



the genus to which it may possibly belong ; a name proposed by its zealous discoverer, Dr. 



Stillman. 



19* 



