PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



REVISION OF THE NEW ZEALAND EISSOIIDiE. 



By Henry Sutee. 



Bead \1th ISfovemher, 1897. 



Genus RISSOIA, Freminville, 1814 {em.). 



Siibgen. EissoiA, s.s. 



Sect. TURBELLA, Leach, 1847. 



1. E.ISSOIA HuTTONi, nom. nov. 



Rissoa nana, Hutton : Cat. Marine Moll. ISew Zealand, 1873, p. 28 ; 



Proc. Linn. Soc. New Soutli Wales, vol. ix (1885), p. 941. 



(Non R. nana, Phil. = R. dolium, Nyst.) 

 Barleeia nana, Hutton : Man. New Zealand Moll., 1880, p. 81. 



Shell minute, imperforate, white or yellowish-white, oval, spire 

 short and blunt; whorls 5, swollen, longitudinally roundly ribbed, 

 about 25 ribs on the penultimate whorl, becoming obsolete on the 

 periphery of the body- whorl, base smooth ; aperture ovate, lip 

 somewhat thickened, continuous. Operculum unknown. Long. 2*5, 

 lat. l"25mm. 



Hal. — Stewart Island. 



Type in the Colonial Museum, "Wellington. 



2. RissoiA Hamiltoni, n.sp. Pig. IV. (p. 5.) 



Shell minute, ovate, rimate, colour dirty-white or cinereous ; 

 whorls 6, convex, protoconch rufous, longitudinally striate, the 

 succeeding whorls with distant, rounded, longitudinal riblets, about 

 14 on the body-whorl, the interstices there being slightly broader, 

 base smooth. There is sometimes a rufous band encircling the upper 

 whorls above the suture, and extending on the body-whorl to within 

 a short distance from the mouth. Suture impressed, marked with 

 a marginal thread which continues on the body-whorl below the 

 periphery to the aperture, intercepting the longitudinal riblets. In 



