UTRICULUS. 217 



enamel upon the body of the shell, partially covering an unil)ilical 

 indentation placed at about one fourth the length of the shell. 

 Length, one tenth of an inch ; breadth, one eighth of an inch. 



Obtained from fishes taken in Massachusetts Bay. Connecticut 

 {Linskii~)\ Grand Manan (Stimpson) ; Maine {Mighels} ; Green- 

 land (iJforc/0. 



This shell has no marked resemblance to any other with which I 

 am acquainted, unless it be to B. Gouldli, of which it may possibly 

 be the young. It is, however, much smaller and thinner, more 

 o-lobular, and its greatest breadth is before, instead of behind, the 

 middle. Tlie peculiarity of the base, also, is well marked. In many 

 respects it has a general resemblance to Montagu's B. dlaphana 

 {Test. Brit. pi. 7, fig. 8), but that has an elevated spire, and is not 

 umbilicatcd. Brown figures a shell, which he calls Diaphana pel- 

 lucida {Conch, of Great Brit. &c., pi. 38, figs. 10, 11), which bears 

 a still more striking resemblance. 



These two last-named species would come under the sub-genus 

 Aplustra of Blainville ; in which tbe whorls are all visible, but the 

 spire not projecting ; and in which there is a thickened portion at 

 the anterior termination of the pillar. 



Oeiius UTRICULUS, Brown. 1844. 



Head disk very short; tentacular lobes lateral, rounded; eyes, 

 none. 



Shell rather thin, sub-cylindrical, imperforate, covered with an 

 epidermis ; spire distinct ; apex obtuse, not mammillated, sutures 

 simple, not canaliculated ; aperture narrow behind, dilated and 

 entire in front, nearly as long as the body whorl ; columella sim- 

 ple, not plicate ; outer lip straight, acute. 



Utriculus Gouldii. 



Fig. 94. 



Shell ovate, Avhite, rather opaque, composed of four whorls, the last including 

 all the others, and covered with minute revolving lines ; spire nearly flat. 



Bulla Gouldii, CotJTHOUY, Best. Journ. Nat. Hist. ii. 181, pi. 4, fig. 6 (1839). — Gould, 



Inv. 16.3, fig. 94. —Db Kay, N. Y. Moll. 15, pi. 5, fig. 101. 

 Utriculus Gouldii, Stimpson, Check Lists, 4 (1860). 



Shell small, ovate, shining, of a dead white color, covered with a 

 yellowish epidermis; whorls four, rounded at their upper edges, 



