Mr. E. A. Smith on a Species o/'Fusus. 



345 



six in number on the upper whorls, about as broad as the 

 sulci between them, about twenty-four on the last, with fine 

 stria3 in the interstices. Those on the first six whorls sub- 

 granular through being crossed bj coarse longitudinal sulci, 

 which produce a clathrated surface. As the shell increases, 

 these sulci gradually diminish and become merely coarse stria 

 or lines of growth. On the last and penultimate whorls the 

 fourth spiral ridge from the top is tubercular, the tubercles 

 gradually increasing in prominence as the lip is approached. 



Half natural size. 



At the tubercles (about twelve in number on the body-whorl) 

 the shell is somewhat longitudinally plicate. Last whorl 

 decidedly concave above, a little angular at the tubercular 

 ridge, convex beneath it, gradually narrowing into a rather 

 short Cauda. Aperture elongate, narrow, together with the 

 short, wide, oblique, and slightly recurved canal occupying 

 almost three fifths of the entire length of the shell, yellowish 

 and rosy white within. Columella gently arcuate at the upper 

 part, oblique and straightish below the middle, of the same 

 colour as the aperture, with only a very thin deposit of callus 

 at the upper part. Outer lip not thickened, wavy at the edge, 

 shallowly grooved within, the grooves corresponding to the 

 rido-es of the exterior. 



