278 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



spaces, the cord in front of the suture slightly more prominent than 

 the others; on the last whorl there are about fifteen spiral cords which 

 are crossed by about twenty axial, incised, equally spaced lines, the 

 segments of the cords thus formed being convexly nodulous ; toward 

 the aperture the axial lines become feebler or obsolete ; aperture short 

 and rather narrow with about six spiral lirations inside the outer lip 

 which is simple and not reflected and hardly thickened; on the pillar 

 are two strong plaits, rather deep within the aperture ; the canal is 

 short and not very deep, with hardly any siphonal fasciole. Length 

 of shell, 4.7; of last whorl, 3.5; of aperture, 2.5; maximum diameter 

 of shell, 2.5 mm. 



Cotypes. — In the Bermuda and U. S. National Museums, Cat. No. 

 221617. 



Named for Mr. Arthur Haycock. 



COLUMBELLA SOMERSIANA, new species. 

 Plate 35, fig. 2. 



Shell of the general type of C. mercatoria Linnaeus but larger and 

 differently sculptured. Color translucent white with spiral lines 

 articulated with opaque white and reddish brown, and with radiating 

 brown flammules above the shoulder of the whorl, all covered by a 

 very thin, smooth, yellowish, dehiscent periostracum. Whorls about 

 seven, nucleus worn, the whorls between the rather deep sutures 

 convex and on the upper part of the spire obscurely nodulous; last 

 whorl with a rounded shoulder, with on the whorl in front of the 

 shoulder about a dozen articulated lines of color, slightly elevated, 

 separated by interspaces about twice as wide as the color lines; the 

 surface of the whorl is sculptured axially by rather widely spaced 

 incised lines visible only under a lens; the type being immature, the 

 thickening of the lips about the aperture can not be described ; the 

 siphonal fasciole is distinct, with two obscure folds in the interior of 

 the shell. Length of shell, 24; of last whorl, 19; of aperture, 17; 

 maximum diameter, 14.6 mm. 



Type. — In Bermuda Museum. 



Ordinarily I should be unwilling to describe a species from a single 

 immature specimen, but in the present case the large size, charac- 

 teristic sculpture, and absence of any species nearer than C. merca- 

 toria with which it could be prudently united, lead me to believe that 

 it is best to put it on record. 



ACLIS BERMUDENSIS, new species. 

 Plate 35, fig. 5. 



Shell minute, elongate-conic, white, subdiaphanous. Nucleus com- 

 posed of a single turn which is well rounded and smooth. Post- 

 nuclear whorls strongly shouldered on the early turns, the shoulder 



