Suter. — Notes on Netv Zealand Mollusca. 323 



Turbo shandi, Hutton (1873). 



I had an opportunity of examining Captain Hutton's type 

 specimens in the Colonial Museum, and I found them to be un- 

 doubted young specimens of Turbo granosus, Martyn. 



Turbo helicinus, Born., subsp. tricostata, Hutton. 



Turbo smaragdus, Martyn, var. tricostatus, Hutton, Proc. Linn. 

 Soc. N.S.W., vol. ix, 1884, p. 355. Turbo (Lunella) radina, 

 Webster, Trans. N.Z. Inst,, vol. xxxvii, 1905, p. 277, pi. ix, 

 figs. 1-16. 



The nealogic stage of this subspecies had hitherto escaped 

 the notice of conchologists, but this beautifully sculptured shell 

 has now been described and figured by the Rev. Mr. Webster 

 under the name of T. radina. It is to be regretted that Webster 

 bestowed a new specific name on this little shell, as further 

 investigation with ample material at hand would have shown 

 him that the form is not adult and not new at all. The larger 

 shells of T. helicinus and its subspecies have, as a rule, the 

 first four or five whorls so much eroded that nothing whatever 

 of the neanic sculpture can be discovered ; but I have specimens 

 in my collection which show quite unmistakably the peculiar 

 sculpture of the young shell, especially the spiniform projections 

 on the suture. I collected a few specimens of T. radina at Taka- 

 puna having a diameter from 2*5-5 mm., and these I used for 

 comparison with larger shells. In specimens with about four 

 whorls there is still a perforation left, but with further growth 

 the umbilicus is perfectly sealed up. On examples from the 

 Hauraki Gulf the ribs very soon disappear, the whorls becoming 

 quite smooth, but on shells collected in Lyttelton Harbour the 

 ribs persist on specimens of about 25-30 mm. diameter. I am 

 of opinion that further investigation will show that all young 

 shells of T. helicinus are tricostate. The subgenus Lunella, 

 Bolten, 1798, used by Webster should be replaced by Marmo- 

 rostoma, Swainson, 1840, as most conchologists reject the names 

 proposed by Bolten. 



^Trochus (s. str.) conus, Gmelin (T/yz; 



Syn. T. acutangulus,^Ch.emmtz (not binomial) ; T. elatus, La- 

 marck. 



A very young specimen of this to me unknown shell was 

 found a few years ago by the lighthouse-keeper of Cape Maria 

 van Diemen, and kindly presented to me. As usual in such cases, 

 there was no literature and no comprehensive collection at my 

 disposal, and I again availed myself of Professor W. H. Ball's 



