216 Transactions.— Zoology. 
Hab. Foveaux Strait. 
UNIO DEPAUPERATUS, N. S. 
Shell very thin, oblong, compressed; anterior end very short, rounded ; 
the posterior slightly winged, and very obliquely truncated; dorsal margin 
gently ascending, slightly arched; ventral margin straight and sinuated in 
the middle; cardinal teeth minute, compressed, smooth, only one in the 
left valve; lateral teeth low and thin. Length 2:4; height 1:2; thick- 
ness '55 inch. 
Hab. Lake Takapuna, Auckland. 
Perhaps an impoverished form of U. zelebori, but too distinct to be 
passed over. The type is in the Colonial Museum, Wellington. 
Unio RUGATUS, N. S. 
Shell oval, rather thin, anterior end compressed, rounded, finely striated ; 
posterior subventricose very rudely concentrically corrugated; dorsal 
margin ascending, straight; ventral margin flatly rounded; cardinal teeth 
rugose, not striated. Length 2:05; height 1:35; thickness -65 inch. 
Hab. Lake Pearson; Upper Waimakariri (J. D. Enys). 
EXPLANATION OF PLATE XI., Fres. 1-5. 
Omphicardelus costellaris. "Teeth x 470. 
ZEolis leptosoma. Teeth x 160, 
Euthria striata. Teeth x 280 
flavescens. Teeth x 280. 
eas cingulata. Teeth x 160. 
St $5 N pa 
£o COSE 
Art X.—Revision of the recent Rhachiglossate Mollusca of New Zealand. 
Capt ain F. W. Hutton. 
[Read before the Philosophical Institute of Canterbury, 6th September, 1883.] 
In the Catalogue of the Marine Mollusea,* and in the Manual of the 
Mollusca, + published by the Colonial Museum and Geological Survey 
Department, no attempt is made to trace out the synonymy of the species, 
and but very little to expunge those names which have no right to appear 
in our fauna. These things were not attempted, partly for want of books of 
* “Catalogue of the Marine Mollusca of New Zealand, with Diagnoses of the 
Species.” By Frederick Wollaston Hutton, F.G.S., C.M.Z.S., Assistant-Geologist 
(Wellington, 1873). 
f “ Manual of the New Zealand Mollusca. A Systematic and Descriptive Catalogue 
of the Marine and Land Shells, and of the Soft Mollusks and Polyzoa of New Zealand 
and the adjacent Seas.” By F. W. Hutton, F.G.S., C.M.Z.S, Professor of Biology, 
Canterbury College, New Zealand University. Late Curator of the Otago Museum 
(Wellington, 1880). 
