PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 377 



Scalaiia Dalliana Verrill & Sniitli. 



Aiuer. Journ. Sci., xx, p. 395, Nov., 1880. 



Several specimens, living', from stations 8G9, 870, 871, and 874, in G5 



to 155 fathoms. 



Acirsa gracilis Vcirill, sp. nov. 



Shell white, with a long:, slender, regularly tapered, rather acute 

 spire and deeply impressed sutures. Whorls eight, evenly rounded, all 

 except the last crossed by slightly raised but distinct rounded ribs, 

 separated by wider interspaces; the ribs are most\ elevated just below 

 the sutures and on the upper whorls. Lower whorls with numerous 

 (eight or more) fine, slightly impressed spiral lines, i)roducing- narrow 

 spiral cinguli, of which the lowest on the last whorl is strongest and bor- 

 ders the base of the shell, which is convex and smootli. The spiral 

 lines are absent near the sutures. Mouth round-ovate, slightly effuse in 

 front. Inner lip slightly rellected. No umbilicus. 



Stations 873 and 894, in 100 to 305 fVithoms. 



This species is much more slender than Acirsa costulata Migh., sp., 1841 

 {=A. horealis and A. IJschrkhtii of authors), and its ribs are more reg- 

 ular and distinct. A. itrcclonga Jeffreys has much liner sculpture. 



Aclis "Walleri Jeffreys. 



G. O. Sars, Moll. Eeg. Arct. Norv., p. 196, pi. 11, fig. 18. 



Three living specimens were taken at stations 892 and 894, in 487 and 

 365 fathoms. 



Aclis striata Verrill, sp. uov. 



Shell small, white, somewhat lustrous, fragile, with moderately ele- 

 vated spire ; whorls six, well rounded, with deep sutures, the last one 

 ventricose. Sculpture numerous fine, close, spiral grooves, covering the 

 whole surface." Ai^erture simple, ovate. Outer lip thin, with a wide 

 and rather deep sinus below the suture, but projectuig strongly forward 

 in the middle, where it is regularly rounded, then recedes somewhat 

 anteriorly, joining the inner lip in an even curve. Inner lip discontinu- 

 ous, slightly concave and rellected in the umbilical region, where it joins 

 the body-whorl. Umbilicus narrow, but deep. Nuclear whorl small, 

 regular, smooth. Length, 4"""; breadth, 2'"'". 



One s])ecimen was dredged by me in the Bay of Fundy, near East- 

 port, Me., in 1808; another was dredged in deep water off Newport, li. 

 I., tliis season, by the United States Fish Commission. 



Tliis species is provisionally referred to Aclis because of its general 

 resemblance to known species of that genus. Both my specimens Avere 

 dead, and I have, therefore, no means of knowing the structure of the 

 animal. Its regular a[)ical whorl shows that it is not an Odostomia. 

 The marked sinus of the outer lip and the distinct umbilicus are features 

 not fouiul in any other shell of our coast of similar size and appearance. 

 Dead and broken specimens might be taken for bleached Gingula aculeiiSj 



