88 



REPORT ON MOLLUSCA 



Retusa frigida, sp. nov. (Fig. 3) 



Shell small, oval, slightly contracted at the waist, rounded below, gradate above. 

 Whorls three, the earlier prominent, with a half-turned-over tip. Suture deeply 

 furrowed. Surface glossy, smooth, except some almost imperceptible spiral grooves 

 on the shoulder. Aperture large, pyriform more than two-thirds the total length of 

 the shell, rounded in front, narrowly arched posteriorly. Outer lip advanced and 



Fig. 3 



sinuate medially, inner lip slightly curled over the long and deep umbilical furrow. 

 Length, 2 - 25 ; breadth, T25 mm. 



One whole and another broken specimen. The novelty is nearest to R. antarctica, 

 Pfeffer,* from South Georgia, from which the axial furrow of the present species 

 clearly distinguishes it. 



* Jahrb. wiss. Anst. Hamburg, III, 1886, p. 189, pi. 3, f. 5. 



