SOME NEW OR NOTEWORTHY SHELLS — HEDLEY. 143 



the adult of the same shell. Thus Dr. Verco concluded that his 

 Vanikoro denselaminata was the young state of Adeorbis viiicetit- 

 iana, Angas."* 



To make clear the change which V. sigaretijonnis undergoes, 

 I present drawings of one specimen 3 5 mm. in diameter and of 

 another 7 mm. in diameter, the species finally reaching a diameter 

 of 1 1 mm. 



Mr. Smith explains"^ that the adult shell of V. expansa,. 

 Sowerby, is unrecognisable from the figure and description of the 

 immatuie type. This species has as yet only been recorded 

 from North West Australia. The additional information now 

 available leads me to identify as V. expansa a shell widely 

 distributed in Queensland, which I collected on the beaches at 

 Mapoon, Karumba, and Forsyth Island, Gulf of Cai-pentaria, 

 dredged in 7-10 fathoms at Port Curtis, and received from 

 Caloundra. 



As far as my experience goes, V. cancellata is restricted to the 

 coral reefs, and in Queensland V. expansa replaces it in the 

 muddy water of the mainland coast. 



Nerita cancellata, Chemnitz, on which Lamarck founded his 

 Sigaretus cancellatus is quite different from the species which 

 Herman had previously and regularly described as Nerita 

 cancellata. " ^ 



Mr. E. A. Smith in the paper above cited, transfers to Vanikoro 

 Adeorbis vincentiana, Angas. Two other species should accompany 

 this, viz. Adeorbis angasi, A. Adams, ^'' and A. angxUata, 

 Hedley2 8. 



These three appear to constitute a distinct section of the 

 genus. 



Syrnola manifesta, sp. nov. 



(Plate xlii., figs. 23, 24). 



Shell rather large, elongate conical, solid, smooth and glossy. 

 Colour uniform milk white. Adult whorls, ten, tapering, 

 gradually increasing, each with a narrow but sharp step at the 



2* Verco— Trans. Roy. Soc. S. Austr., xxxiv., 1910, p. 118. 



25 Smith— Proc. Malac. Soc, viii., 1908, p. 109. 



^6 Herman— Naturforscher, xvi., 1781, p. 56, pi. ii., figs. 8, 9. 



27 Adams— Proc. Zool. Soc, 1863, p. 424, pi. xxxvii., figs. 11, 12. 



»8 Hedley— Rec Austr. Mus., vL, 1905, p. 50, fig. 15. 



