456 



STUDIES ON AUSTRALIAN MOLLUSC A. Part X. 

 By C. Hedley, F.L.S. 



(Plates vii.-x.) 



(Continued from Vol.xxx , p.5J/.6.) 



Trophon paivyE Crosse. 



(Plate ix., fig. 18 ) 



A young shell, 3 mm. in length, of four whorls, is here shown. 

 Two nepionic whorls are smooth and globose, the initial one set 

 obliquely. Subsequent whorls are ornamented by about a dozen 

 erect radial lamella, on the shoulder puckered into a spout and 

 descending obliquely from whorl to whorl. As growth proceeds, 

 the lamellae do not enlarge in proportion, but multiply in number. 

 Spiral cords appear on the fourth or fifth whorl, enlarge, and, on 

 the sixth, predominate over the radials, which decrease to mere 

 scales. 



In early life the shell thus appears as a regular Trophon, but 

 modification of sculpture in maturity has masked this affinity 

 and induced authors to assign it to other genera. Hutton 

 included T. pawce* in a genus Kalydon he had framed for 

 Trophon-like shells without varices. In our waters that genus 

 appears to me to be represented by Ricinula adelaidensis Crosse, 

 and Purpura neglecta Angas. The apex of the latterf is quite 

 different. In Moreton Bay T. paivce appears to closely approach 

 if not to merge into a large form which I take to be Buccinum 

 funiculatiim Reeve! and Latirus strangei.§ 



* Trans. N.Z. Inst. xvi. 1883 (1884), p. 220. 



+ Kesteven, these Proceedings, 1902, xxvi. p.714, Pl.xxxvi. f.2. 



X Conch. Icon. iii. Buccinum, 1846, Pl.viii. f .61. 



§ A. Adams, Proc. Zool. Soc. 1854, p.316. 



[Printed off August 13th, 1908.] 



