21 G 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 XL, Figs. 1-5. 

 Fig. 1. Omphicardelus costellaris. Teeth X 470. 



2. JEolis leptosoma. Teeth X 160. 



3. Euthria striata. Teeth X 280. 



4. ,, flavesccns. Teeth X 280. 



5. Acmcea cingulata. Teeth X 160. 



Art X. — Revision of the recent Ehachiglossate Mollnsca of New Zealand. 

 By Captain P. W. Hutton. 

 [Read before the Philosophical Institute of Canterbury, 6th September, 1883.] 

 In the Catalogue of the Marine Mollnsca,* and in the Manual of the 

 Mollnsca, | 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). 



t " 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). 



