250 Transactions. — Zoology. 



Fam. LIMNIID^E. 

 Sub-fam. ANCYLIN^. 

 Genus Gundlachia, Pfeiffer (1849). 

 Zeitschrift f. Malak., vol. vi., 1849, p. 98. 



Gundlachia lucasi, n. sp. Figs. 10, 11. 

 Lake Waikare (Stat. 30 and 30f — Netting in weeds). — Three 

 specimens; two of them were collected alive. Shell obliquely 

 conical, thin, semitransparent, horn-colour, covered by a black- 

 ish coating ; apex inclined ■ 

 to the right, situated at the 

 posterior third of the length ; 

 convex anteriorly, slightly 

 r ^ io r- . in concave on the posterior 



5 ' ^' slope; a few concentric hues 



of growth. Aperture oval ; peritreme sharp, extremely fragile. 

 No septum, the shells being in the Ancylus stage of development 

 only. Dimensions of two specimens — Length, 3 mm. ; breadth, 

 2 mm. ; height, 1 mm. : length, 4 mm. ; breadth, 2| mm. ; height, 

 1| mm. The dentition is very similar to that of the Gundlachia 

 sp. from the River Avon,* which settles the generic position. 



This species stands nearest to G. tasmanica, T. -Woods. It is 

 more rounded and elevated than the species from the River 

 Avon. There is also one specimen of G. lucasi from Inglewood 

 in my collection. 



The occurrence of two species of Gundlachia in three different 

 localities leaves no doubt that the genus is endemic, and acci- 

 dental introduction out of the question. 

 Type in my collection. 



I have great pleasure in uniting with the species the name of 

 Mr. K. Lucas, who so ably and successfully collected the fauna of 

 New Zealand lakes. 



Sub-fam. LATENT. 



Genus Latia, Gray (1850). 

 Latia neritoides, Gray (1850). 



P.Z.S., 1849, p. 168 (1850). 



Lake Waikare (Stat. 35 — Dredged in 4 ft. ; stony shore). — 

 One small typical specimen, 5 mm. long. 



Sub-fam. LLMNiEEs.K. 



Genus Amphipeplea, Nilsson (1822). 

 Nilsson, Hist. Moll. Suec, p. 58. 



Amphipeplea arguta, Hutton (1885). 

 Trans. N.Z. lust., vol. xvii., p. 54, pi. xii., fig. 1. 



(1.) Lake Waikare (Stat. 19 and 19f — From reeds). — Fourteen 

 * Trans. N.Z. Inst., xxvi.. pi. \i\.. fig. .V 



