286 Transactions. — Zoology. 



it in the neighbourhood of his place. To my knowledge this 

 mollusc was hitherto only recorded from the North Island, 

 and its occurrence on the South Island is highly interesting. 

 I may add that Dr. 0. F. von Moellendorff, one of the highest 

 authorities on the molluscan fauna of the Philippine Islands, 

 &c., fully agrees with me that our mollusc belongs to the 

 genus Vitrinoidea, Semper. 



Aet. XXIII. — On the Dentition of some New Zealand Land 

 and Fresh-water Mollusca, with Descriptions of Neiu 

 Species. 



By H. SuTER. 



\_Beacl before the Philosophical Institute of Canterhury, 4th November, 



1891.'] 



Plates XX.-XXIII. 



Paryphanta urnula, Pf. From Lowry Bay, Wellington. 



Plate XX., fig. 1. 



Badnla about 14mm. long, 3^mm. broad at the anterior 

 end, tapering posteriorly, with about 40 transverse rows of 

 teeth, the rows forming an obtuse angle of about 120°, salient 

 posteriorly. 



Teeth, 14 — — 14, all aculeate ; the first rather small and 

 fragile, rounded anteriorly and pointed behind. The follow- 

 ing teeth are growing longer, with a curved ridge across the 

 middle, thus giving them the appearance of an open knife. 

 On the fourth tooth the forming of a median projection on the 

 outer side is beginning, and a longitudinal ridge is running 

 down the posterior half of the tooth. The teeth are increas- 

 ing in size to the last but one. The thirteenth is long and 

 stout, broadly rounded anteriorly, the head of the tooth sole- 

 shaped, a longitudinal almost straight ridge along the inner 

 side of the tooth. Last tooth only about half the length of 

 the foregoing. 



The radula of this species is remarkable for the small 

 number of teeth, compared with P. hushyi. 



The specimens were kindly given me by Sir James Hector. 

 Two are kept alive, but will be used later on for further in- 

 vestigations. 



"O" 



Phacussa hypopolia, Pf . From Hooker Valley, South Island. 

 Plate XX., figs. 2, 3, 4. 



Jaio strongly arcuated at both ends, rather high, slightly 

 tapering, with numerous narrow plaits, which denticulate 



