BY W. L. MAY. 93 



RISSOA PUPOIDES, Sp. Nov. 



Shell minute, white, shining, cylindrical, apex blunt and 

 rounded. Whorls 5, much rounded, suture deeply im- 

 pressed. Mouth roundly ovate, pointed above. Columella 

 expanded over an umbilical chink. 



Length 1.7. Breadth 0.8 mill. 



Type, from 50-70 fathoms, off Port Arthur, with about 

 a dozen others. Remarkable for its pupseform shape and 

 minute size. 



PI. V., fig. 25. 



RISSOA SIMILLIMA, Sp. Nov. 



Shell very small, bluntly conical, bx*oad, solid, whitish. 

 Whorls 4, rounded, rapidly increasing, apical one glassy 

 and shining, the rest opaque ; suture well impressed ; body 

 whorl very large. Mouth large, rounded on the outer 

 lip, but rather straight on the columella, producing an 

 angle in front; lip patulus, and reflexed oxer a distinct 

 umbilical crevice. Sculpture : The body whorl is crossed 

 axially by numerous narrow, horny, or translucent bands, 

 which seem as though they might be the intervals be- 

 tween very low riblets, or growth lines, but I have not 

 been able to quite satisfy myself that these spaces are 

 really raised. 



Length 1.8. Breadth 1.3 mill. 



This is very neiar to R. principis, Watson, Chal. Report, 

 p. 608, Pi. XLIV., f. 13, of which it may be a variety. 

 Our shell is broader, and the mouth more angular. Al- 

 though not common, it seems to be well distributed on our 

 continental shelf. 



PI. V., fig. 26. 



RISSOA MULTILIRATA, Sp. Mov. 



Shell elongately pyramidal, white, clouded with a few 

 chestnut "blotches. Whorls five, rounded, including a 

 smooth pullus of two rounded whorls. -the sculpture 

 consists of flatly rounded keels, separated by narrow 

 grooves, about eight on the penultimate, and ten on the 

 body whorls; base smooth. The first keel, below the 

 well-impressed sutures, is larger than the others, and has 

 a wider groove below it. Aperture roundly pyriform ; 

 columella lip expanded, rather produced in front. Outer 

 lip slightly denticulated by the sculpture. 



Length 3. Breadth 1.5 mill. 



