VOLUTOPSIS. 121 



1ST. ATTENUATA, Dall. PI. 50, fig. 296. 



Shell solid, pinkish white, much attenuated before and behind ; 

 spire one-quarter shorter than the aperture. Whorls six, apex 

 mammillated. Posterior surface of the valves flattened towards 

 the suture, where they are somewhat wrinkled and appressed. 

 Surface of the whorls completely covered with fine, even, spiral 

 lines. Aperture long and narrow, a thickened callus on the inner 

 lip, and the outer lip slightly reflected. Canal long, nearly 

 straight, rather narrow. Length 2'33 inches, lat. 1 inch. 



Behring's Strait. 



I do not know this species. The long canal is a feature not 

 consistent with Volutopsis ; nevertheless, Mr. Dall places it here. 

 Is it not equivalent to the next species ? 



N. PERICOCHLION, Schrenck. PI. 49, figs. 284, 286. 



Shell canaliculate, spirally striate, white under a yellowish or 



reddish brown epidermis. Length, 4 inches. 



Japan. 



N. tabulata, Baird (fig. 286), of which a single dead specimen 

 was dredged in Esquimault Harbor, Vancouver's Island, may be 

 synonymous with N. pericoclilion. It has six whorls, flattened 

 above and canaliculate next the sutures, covered with revolving 

 striae, which are asperate ; the canal is of considerable length, 

 bent to one side. Length 3 inches, lat. 1*33 inches. 



Carpenter mentions a second dead specimen, dredged at 120 

 fathoms, Catalina Isl., Cal. 



N. BEHBINGII, Middendorff. PI. 49, fig. 280 ; PI. 50, figs. 289, 290. 

 Shell ovate-fusiform, rather solid when adult, whorls obtusely 

 shouldered, irregularly plicate longitudinally, with minute revolv- 

 ing striae, which are lost on the middle of the body-whorl but 

 become more conspicuous at its lower part. Yellowish white ; 

 epidermis deciduous, membranaceous, brown. 



Length, 4-5 inches. 



Behring's Sea. 



The rudely folded whorls are the distinguishing characteristic of 

 this species : of which there is a short-spired variety, N. castanea, 

 Morch, which equals N. Kennicottii, Dall (fig. 290). 

 16 



