266 Transactions. 



is smaller than Pliocene specimens usually are, being 16 mm. 

 high, but otherwise it cannot be separated from the fossil form. 

 This species appears first in the Upper Miocene of New Zealand. 



4. Ancilla depressa, Sowerby. 

 AncUlaria depressa, Sow., Thes. Conch., vol. iii, 1859, p. 63, 

 pi. 211, fig. 3. A. lata, Hutton, Trans. N.Z. Inst., vol. xvii, 

 1884 (1885), p. 325 ; Pliocene Moll. N.Z., 1893, p. 44, pi. 6, 

 fig. 15 ; Suter, Trans. N.Z. Inst., vol. xxxviii, 1905 (1906), 

 p. 332. 



I am under obligation to Mr. J. H. Ponsonby, of London, 

 for copies of the diagnosis and a beautifully coloured figure 

 from the Thesaurus, which leave not the least doubt about the 

 identity of the two species. Sowerby's name has priority. 

 Reeve treats A. depressa as a synonym of A. australis. Sow., 

 but the two are quite distinct. 



5. Heliacus variegatus, Gmelin. 

 One specimen, kindly identified for me by Mr. C. Hedley, 

 was dredged by Captain J. Bollons in 37 fathcms off Cuvier 

 Island, but without the characteristic operculum. This is a 

 highly interesting addition to our fauna. The shell is usually 

 known as Torinia variegata, but Harris has shown* that Torinia, 

 Gray, is only a list name, and that Heliacus, d'Orbigny, 1842, 

 should be used. 



6. Neojanacus perplexus, n. gen. et n. sp. 

 Genus (?), Murdoch and Suter, Trans. N.Z. Inst., vol. xxxviii, 



1905 (1906), p. 301, pi. 27, figs. 52-54. 



Since describing this curious shell I examined the specimen 

 several times carefully, and it struck me that it looked very 

 much like Crepidula (Janacus) crepidula, L. (= unguiformis. Lam.) 

 without a septum ; I first thought that this had been broken 

 off, but examination under a powerful lens revealed no trace of 

 fracture, the under-surface being everywhere smooth and polished. 



Amongst shells dredged by Captain J. Bollons in 18 fathoms, 

 Port Pegasus, Stewart Island, I found to my great surprise 

 a number of specimens of the very same shell in different 

 stages of growth, quite young examples being oval in shape ; 

 none had the animal attached to the shell, and the anatomy, 

 therefore, still remains unknoAvn. I sent a few specimens to 

 Dr. W. H. Dall, of the U.S. Nat. Museum, and I am indebted 

 to him for the following information : " The shell from Stewart 

 Island is very curious. It is certainly not a Crepidula, the fea- 



* Cat. Tert. Moll., part i, p. 245. 



