Suter. — On New Zealand Mollusca. 245 



Four specimens were measured — Length, 2f-5 mm. ; height, 

 2J-4 mm. ; diam., 1^2i mm. : and the mean indices are — iii. = 83 ; 

 vii. = 48; x. = 59. 



These specimens are very much like those I collected in the 

 River Avon, Christchurch. 



(2.) Lake Waikare (Stat. 29f— From weeds in 1-|- ft. to 2 ft,).— 

 Four specimens, dead when collected. They do not differ much 

 from those of Stat. 29, except being slightly more globular. 

 The dimensions of three specimens measured are — Length, 

 5 mm. ; height, -14 mm. ; diam., 3J mm. ; umbo 3 mm. from 

 anterior margin : length, 4J mm. ; height, 3| mm. ; diam., 

 2J mm. ; umbo 2h mm. from anterior margin : length, 3 mm. ; 

 height, 2J mm. ; diam., H mm. ; umbo If mm. from anterior 

 margin. The mean indices are — iii. = 85 ; vii. = 56 ; x. = 58. 



(3.) Lake Wakatipu (Stat. 17 — Dredged with weeds in 20 ft. 

 to 100 ft.). — One minute specimen, rounded, yellowish-white, 

 sub equilateral. Length, 2£ mm. ; height, 2 mm. 



This small specimen has the aspect of a Sphcerium, but the 

 nepionic shell is so distinct that I prefer placing it in Corneocyclas 

 for the present. I tried to separate the valves, but could not do 

 it without running the risk of breaking the valves. Without 

 ample material, and especially examining the living animal, it 

 is impossible to be quite certain about its generic position. 



(4.) Lake Wakatipu (Stat, 34— Dredged in 10 ft. to 30 ft.).— 

 One adult and four young specimens. The adult is light-brown, 

 the nepionic shell distinctly limited ; the young examples are 

 grey to yellowish, more inequilateral and tapering in front. The 

 dimensions of two specimens are — Length, b\ mm. ; height, 

 ih mm. ; diam., 2| mm. ; umbo 2f mm. from anterior end : 

 length, 3 J mm. ; height, If mm. ; diam., 1| mm. ; umbo 2 mm. 

 from anterior end : and the mean indices are — iii. = 83 ; vii. = 46 ; 

 x. = 55. 



There is one specimen, covered with a black coating, which 

 is suborbicular, much compressed, inequilateral, with incon- 

 spicuous beaks, the anterior side broadly rounded. The di- 

 mensions are — Length, 4 mm. ; height, 3J mm. ; diam., 1^ mm. ; 

 umbo 2^ mm. from anterior end : and the indices are — iii. = 81 ; 

 vii. = 38 ; x. = 62. I have seen similar abnormities amongst 

 specimens I collected in the River Avon. 



(5.) Lake Manapouri (Stat. 13 — Dredged in shallow water 

 near the shore). — Three young specimens, which are at once 

 recognised as being Corneocyclas, being more inequilateral, com- 

 pressed and attenuated anteriorly than adult specimens. Had 

 I not seen the same forms from other localities, collected together 

 with adult examples, I might have been inclined to consider 



