Comprehensive Description

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Description

RISSOIA GLACIALIS.

 

(Pl. II., fig. 4.)

 

 

Shell ovately conical, narrowly perforated, white, smooth, glossy, exhibiting only fine striæ of growth; whorls 5-6, very convex, and consequently separated by a deep suture, which is only slightly oblique; aperture rounded, a little longer than broad; peristome continuous, the outer or right margin being simple and unthickened, and the columellar edge is slightly reflexed.

 

Length, 3.5 millim.; diam., 2; aperture, 1.2 long.

 

Holes 10, 12. In 25 and 127 fathoms.

 

A smooth shell without any striking features. Two specimens only were obtained. They differ from the other smooth species here described, R. adarensis and R. deserta, in form. The body-whorl is broader than that of the former, so that the spire looks more conical, and the spire is more produced than that of the latter, the mouth of which is larger and rounder than in the present species.”

 

 

(Smith, 1907: 9-10)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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