[From the ‘PROCEEDINGS OF THE Matacotoarcat Society,’ Vol. IIT 
Part 1, April, 1898. ] 
Ue 
REVISION OF THE NEW ZEALAND RISSOIIDA. 
By Henry Sorter. 
Read 12th November, 1897. 
Genus RISSOIA, Fréminville, 1814 (em.). 
Subgen. Rissora, s.s. 
Sect. TURBELLA, Leach, 1847. 
1. Ruissora Hurronr, nom. nov. 
Rissoa nana, Hutton: Cat. Marine Moll. New Zealand, 1878, p. 28 ; 
Proc. Linn. Soc. New South 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°6, 
lat. 1:25 mm. 
Hab.—Stewart Island. 
Type in the Colonial Museum, Wellington. 
2. Rissora Hamitront, nsp. Fig. 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. ‘here is sometimes a rufous band encircling the upper 
whorls above the suture, and extending on the body-whorl to within 
@ short distance from the mouth. Suture impressed, marked with 
@ marginal thread which continues on the body-whorl below the 
Periphery to the aperture, intercepting the longitudinal riblets. In 
