21 
Fossarus minutus Petterd. 
North Island: 16, several empty shells, max. h. 1.5, br. 1 mm; 
whorls 5. 
To this species I refer a form which at the first glance res- 
embles a small Rissoa but which appears to be akin to F. hyalinus, 
from which it differs in its smaller size, more solid shell, continuous 
peristome, less produced outer lip, and rather shallow sinus of lower 
lip. The spire varies somewhat in height, being in the largest 
specimens, with 5 whorls, about 1 Vs times the aperture in height, 
in smaller ones the spire is proportionally shorter. There is, 
however, no distinet tooth on the columella in any of the specimens, 
though a faint convexity may be present. The outer lip may be 
varicose or not. 
Fam. Ri S el lid ae. 
Risellopsis varia (Hutton). 
North Island: 3, many small sps. — 9, 3 small sps. — Stewart 
Island: 31, 2 sps., d. 4.5 (var. carinata K este ven). 
Fam. Rissoidae. 
Rissoa cheilostoma Ten i so n-W ood s. 
North Island: 11b, 1 sh., h. 3. 
Rissoa foveauxiana Sut er. 
Stewart Island: 36a, many shs., h. 2.4. — The shells are in- 
distinctly shouldered, the uppermost 4 spiral ridges are stronger than 
the subsequent ones and have interspaces of the same breadth as 
the ridges; the remaining ones are narrower. In the penultimate 
whorl the upper ridges are solely present, the lower ones being 
extremely faint; there are about 11 spirals in all. 
Rissoa voseola I redal e (=rosea Hutton, non Deshayes). 
Auckland Island; 40, many sps., h. 1.9. — 41, Figure 8 Island, 
under stones at low water, 2/2 1915, many sps. — 41, Masked 
Island, on rocks, some sps., h. 1.9. 
