2 1 S Transactions. — Zoology. 



Cylichna striata, Hutton. Figs. 1, 2. 



Cylickna striata, Hutton, Cat. Marine Moll. N.Z., p. 52 (1873) ; 

 Cat. Tertiary Moll, and Ecliin. N.Z., p. 16 ; Manual N.Z. 

 Moll., p. 120; Trans. N.Z. Inst., vol. xviii., p. 346. C. 

 arachis, Hutton, " Macleay Memorial Volume," p. 37 (not of 

 Quoy and Gaimard). C. striata, Hutton, " Index Faunae 

 NovsB-Zealandise," p. 69 (not striata, Pilsbrv, Man. Conch. (1), 

 vol. xv., p. 319, pi. 59, figs. 11, 12). 



The types of this species are in the Colonial Museum. I 

 have been unable to examine them, but Mr. C. Freyberg kindly 

 did so at my request. They appear to be in good condition, 

 sculptured with longitudinal growth-periods distinctly marked, 

 but a total absence of spiral striae ; in fact, agree perfectly in 

 all characters with the Whangaroa Harbour examples, of which 

 there is a good series. 



Pilsbry, when dealing with the specimens he had received 

 from New Zealand, evidently had some doubts as to whether 

 they were the true striata, remarking that the measurements 

 given by Hutton indicated a much smaller form than his spe- 

 cimens. In addition to the larger size of his specimens, the 

 measurements prove that they were of a more narrow, slender 

 form. I have no doubt they were C. arachis, Quoy and Gaimard, 

 with which the description agrees very well indeed. Examples 

 of the latter species from New Zealand (I have only seen two) 

 appear to be rather more minutely spirally striate than those 

 from Port Jackson. 



The figures and following description of C. striata is derived 

 from the Whangaroa specimens : Shell short, subcylindrical, 

 thin and white ; last half- volution with a lightly concave ap- 

 pearance, more noticeable on approaching the lip. Sculptured 

 with numerous well-marked longitudinal growth-periods, irregu- 

 larly spaced. The crown concave, with a deep and moderately 

 broad axial perforation. Aperture as long as the shell, narrow 

 above, expanded and effuse below ; the inner wall with a very 

 thin callus. Columella thickened, slightly twisted, anteriorly 

 rapidly declining, giving it an almost truncated appearance. 

 In the juvenile stages the columella is usually more gently 

 sloping ; the crown with the same crater-like concavity, but 

 the axial perforation shallow; the outer lip almost straight. 

 Dimensions of largest specimen: Length, 3-8 mm.; breadth. 

 1-87 mm. 



It is pel Imps nearest to C. pygmcea, A. Adams, from Australia, 

 but this species is adorned with well-marked somewhat distantly 

 spaced spiral stria'. 



