35 



DESCRIPTION OF CALLWSTOMA FURPUREOCINCTUM, 

 A NEW MARINE AUSTRALIAN SHELL. 



By C. Hedley, F.L.S. 



(Communicated by perinission of the Trustees of the AustroUan 

 Museum.) 



Calliostoma purpureocinctum, n.sp. 



Shell small, turreted, solid, thick. Colour orange-yellow, with 

 a pale lilac band ascending the spire on the peripheral bead-row ; 

 some specimens show on the periphery brown flames succeeded 

 by lighter dashes, both vanishing at the centre of the whorl. 

 Surface glossy. Whorls eight. First whorl and a half smooth, 

 on the next whorl a peripheral and two minor bead-rows may 

 be discerned. Throughout the spire the peripheral bead-row is 

 distinguished l)y its lilac colour and 

 by its larger grains, of which the 

 last whorl bears about 40 ^ beneath 

 this row and margining the suture 

 of the following whorl there runs a 

 simple unbeaded thread. On the 

 fourth whorl a third minor bead-row 

 appears. By the sauie {)rocess of 

 growth as the latter arose, a thread, 



intercalated between the bead-rows of the antepenultimate whorl, 

 enlarges, produces small, then larger, beads, and finally equals, on 

 the last whorl, the original series. Behind the aperture these 

 minor bead-rows amount to six. Within the row these beads are 

 separated by the space of their diameters, and are " strung " on a 

 fine thread ; the interval between each row is finely obliquely 

 striated. The base is encircled by a dozen spiral threads of 



