222 Transactions. — Zoology 



and purple. Aperture ovate, with a well-marked chestnut band 

 on the base, and the colour of the sculpture feebly produced. 

 Outer lip sharp, sinuous. Columella short, nearly straight, 

 and the beak slightly twisted to the left. Length, 6*25 mm. ; 

 breadth, 1*8 mm. 



Type in the Colonial Museum. 



Hab. Kawhia Harbour, immediately within the entrance, 

 on rocks at low tide (R. M.) ; Whangaroa Harbour and Plimmer- 

 ton, Cook Strait (Mr. Hamilton). 



This beautiful little shell appears to be quite distinct from 

 other New Zealand species. The few specimens obtained are, 

 except that from Kawhia, dead and somewhat bleached ; never- 

 theless the only example with the apex uninjured is from Wha- 

 ngaroa. The protoconch consist of about 3| smooth rounded 

 whorls, the apex globose, with the first half-turn oblique. The 

 brephic period is not very distinctly marked off — it appears 

 to consist of one volution ; upon it a spiral riblet commences, 

 which on the succeeding whorls forms the anterior spiral ; thence 

 follows somewhat strong longitudinal strise, marking as it were 

 short periods of growth, and from amidst these arise two posterior 

 spirals, abruptly followed by the adult sculpture. 



Leptothyra fluctuata, Hutton. Fig. 10. 



Cyclostrema fluctuata, Hutton, Trans. N.Z. Inst., vol. xvi., p. 215 

 (1883, issued May, 1884). Leptothyra fluctuata, Hutton, Pils- 

 bry, Man. Conch. (1), vol. x., p. 259, pi. 64, figs. 47, 48. L. 

 fluctuata, Hutton, " Index Faunae Novse-Zealandise," p. 81. 



This species occurs in fair numbers. The irregular waved 

 longitudinal bands of brown are well marked in some individuals ; 

 they extend across the base, but do not reach the umbilicus ; 

 the latter usually whitish, at times with broad white radiations. 

 The spiral cingula vary from about twenty-five to thirty-five 

 on the last whorl ; the umbilicial area frequently cut up with 

 strong irregular growth-periods. The outer lip descending, 

 rather sharply in some, a thick callus uniting it to the colu- 

 mella. Height, 2*42mm. ; breadth, 3-11 mm. 



The figure is derived from specimens collected by Mr. A. 

 Hamilton at Whangaroa Harbour. 



Captain Hutton kindly compared these northern forms with 

 the types in the Canterbury Museum. 



Hab. Foveaux Strait. 



I have also to record the species from the Pliocene formation, 

 Shakespeare Cliff, Wanganui — a single example, smaller than the 

 recent forms. 



