BY W. L. MA.Y. 47 



RISSOA ARCHENSIS, Sp. Nov. 



PI. II., fig 5. 



Shell solid, conical, white; whorls four, rounded, of 

 which the first one and a half are a sharply defined proto- 

 conch, which is perfectly smooth. Sculpture : On the 

 shoulder is a smooth slope, succeeded by two strong, round- 

 ed keels, separated by a somev/hat narrower furrow ; the 

 body whorl bears eight keels, of which the two peripheral 

 ones are much the stronger, and most distant, the lower 

 ones being close together. Aperture rather pyriform, 

 lip well expanded. Behind the columella is an umbilical 

 chink. Length 2.3, breath 1.3 mill. 



Locality — Type, with eight others, dredged off Arch 

 Island, D'Entrecasteaux Channel. This species is closely 

 related to R. lockyeri, Hedley, Endeavour Moll., 1911, but 

 is distinguished by its smooth protoconch, the bicarinate 

 spire, the broader, and more closely set body spirals, and 

 the expanded lip. 



RISSOA SCHOUTANICA, Sp. Nov. 



PL II., fig. 6. 



Shell small, pyramidal, solid, yeliowis'h-white ; whorls 

 four and a half, including a protoconch of one and a half 

 turns, which is very finely concentrically striated. The 

 three adult whorls are strongly rounded, and the suture 

 well impressed. The upper third of the whorl has a 

 smooth slope, followed by two strongly raised, rather sharp 

 edged keels, separated by deep furrows of about equal 

 width ; on the body whorl there is a third, but much 

 smaller, keel, and the base of tlie shell is smooth, or has 

 several obsolete, scarcely discernible keels. Aperture 

 subcircular, lip massive, somewhat expanded, and much 

 produced below the columella, behind which is a distinct 

 umbilical chink. Length 2.5, breadth 1.5 mill. 



Locality. — The type, with 15 others, from 40 fathoms 

 3 miles east of Schouten Island. This species has some 

 resemblance to R. imbrex, Hedley, Proc. Linn. Soc. N.S. 

 Wales, 1908, but is much broader, with a different aper- 

 ture. Other allies are R. lockyeri, Hedley, and R. arch- 

 ensis, May, from both of which it is sufficiently distinct. 



