228 RETUSA. 



a little tumid in front. Suture slightly impressed. Outer lip 

 rounded and cut off backwards above, angulated at its upper outer 

 corner, straight with a slight medial contraction, rounded and patu- 

 lous in front ; its edge line is very regularly curved. Top deeply 

 excavated, with a sharp edge. Inner lip: there is a very thin 

 glaze ; the line across the body is much curved, the narrowing for- 

 ward of the body beginning early and being considerable ; the pil- 

 lar is very oblique, subtruncate, very bluntly and faintly toothed, 

 with a narrow expanded sharpish bordered edge, and an almost im- 

 perceptible umbilical chink behind it. Alt. 0*13 in., diam. 0'07. 

 Mouth breadth at same place O'Ol inch (Wats.). 



Ascension Island, 420 fms. (Challenger). 



Utrieulus oryctus WATS., J. L. S. L. xvii, p. 337 ; Chall. Gastr. 

 p. 653, pi. 48, f. 12. 



The very sharp outer rim of the crown in this species is character- 

 istic. The species slightly resembles a large and stumpy Cylichna 

 umbilicata (Mont.), but is posteriorly squarer and more truncate 

 the whole top is different, the line of the pillar is straight in its 

 obliquity, not roundly hollowed, and there is no spiral sculpture. 

 (Wats.). 



R. ANTARCTICA Pfeffer. PL 23, fig. 47. 



Shell very thin, whitish, cylindrical-ovate, the width five-ninths 

 the altitude; spire elevated, the vertex oblique. Whorls 3, separ- 

 arated by a channelled suture, the last whorl three-fourths the 

 length of the shell, tapering toward the base. Aperture narrower 

 above, much dilated below, the outer lip slightly flexuous, sub- 

 auriculate above, obtusely rounded below ; columella strongly ar- 

 cuate, without fold. Alt. 2-7 mill. (P/r.). 



South Georgia. 



Utrieulus antarcticus PFFR., Jahrb. Hamburgischen Wissensch. 

 Anstalten, iii, p. 109, pi. 3, f. 5, 1*86. 



Described from a single specimen found among roots of Hydroids. 

 It is excessively fragile. The attenuation of the body-whorl below 

 is its principal peculiarity. 



R. INVOLUTA Philippi. Unfigured. 



Shell small, cylindrical, transversely striated above and below, 

 milk-white ; apex retuse and with a profound pit like an umbilicus ; 

 aperture linear, very narrow, suddenly dilated at the base, very ob- 



