248 Transactions. — Zoology. 



muddy bottom). — All the seven specimens are " dead shells," 

 therefore very fragile. They are shouldered, with traces of spines, 

 covered with a dark-brown coating ; no carina below the peri- 

 phery. Dimensions range from 6| x 4 mm. to 8| x 5 mm. 



(7.) Lake Taupo (Stat. 39— With weeds, from 20 ft. to 80 ft.). 

 — There are seventeen specimens, of light-horn colour, and of an 

 astonishing variability. Some call to mind the graceful, slender 

 P. egenus, while others are more ventricose and short. Especially 

 the elongated specimens show a very distinct angle on the body- 

 whorl, arising from the junction of the outer lip with the whorl. 

 Only a few are shouldered, but devoid of spines. The peritreme 

 is dark-brown. The dimensions of four specimens are — 4 x 

 2f mm. ; 5^ x 2| mm. ; 6 x 3 mm. ; 6 x 3J mm. All adult speci- 

 mens have six whorls. 



(8.) Lake Taupo (Stat. 39f— With weeds, from 20 ft. to 80 ft.). 

 — Four small specimens, covered with a grey coating, with six 

 smooth convex whorls and a brown peritreme. They come very 

 near P. antipodum, subsp. zelandim, but the whorls are more 

 convex and the suture deeper. This is the most extreme form 

 of salleana I have seen. The dimensions are — 4 x 2 J mm. ; 

 4J x 2J mm. ; 4| x 2J mm. ; 5 x 2J mm. : the ratio of breadth 

 to length varying from 1 : 1*6 to 1:2. 



(9.) Lake Taupo (Stat. 40— With weeds, from 20 ft. to 80 ft.).— 

 A large number of young specimens, most of which are distinctly 

 angled below the periphery. Only two adult specimens, one 

 smooth, one with spines. Colour, &c, the same as in examples 

 from Stat. 39. The dimensions are 5 x 2| mm. and 5x3 mm., 

 with six whorls. 



(10.) Lake Taupo (Stat. 40f— With weeds, from 20 ft. to 

 80 ft.). — Numerous young specimens, none adult, showing the 

 same characters as those from Stat. 40, but they are covered by 

 a green coating. 



(11.) Lake Taupo (Stat. 47— Dredged in 400 ft,).— Four adult 

 specimens, with a very thick black coating, very markedly shoul- 

 dered, seven whorls, no spines, but there is an exceptionally 

 strong carina ; mouth snow-white. Dimensions, 7 x 4J mm. 



(12.) Lake Waikaremoana (Stat. 3 — Dredging in 50 ft. to 

 100 ft.). — Fifteen adult specimens, of a cinereous colour, with 

 six whorls which are mostly shouldered and have rudimentary 

 bristles ; a few only have rounded smooth whorls. Peritreme 

 light-brown. Dimensions range from 4i x 2J mm. to 6 x 3| mm. 

 These may be considered as typical forms. 



(13.) Lake Waikaremoana (Stat. 17 — Dredging in 800 ft.). — 

 One specimen, a " dead shell," with the last whorl broken off. 

 It is thickly coated with calcareous substance, stained orange 

 by oxide of iron. There are rudimentary spines visible on one 



