of new south wales. 11?, 



35. — Cyclophortjs (Ditropis) Beddomei. 



Shell sub-orbicular, depressed, thin, whitish brown, striae rather 

 rugose, whorls 3|, the last large and flattened in front, having 

 two distinct spiral keels, one above the periphery and contiguous 

 to the suture, the other below, leaving a passage between them ; 

 the upper whorls smooth and convex, spire short, apex obtuse, 

 base angular, umbilicus wide and deep, encircled with a keel, and 

 having one well down, aperture oblique, somewhat circular, 

 peristome thickened, brown, margins appi*oxi mating and joined by 

 a thin callus plate, the right or upper considerably thickened, the 

 basal margin produced outwardly, columellar hollowed out and 

 slightly reflected at the umbilicus. 



Diam. Maj. §, min. |, alt. -J- lin. 



Hob. Cape York, North Australia. 



This species differs from Gydophorus Whitei, Brazier, by being 

 more depressed, the keels only being contiguous to the suture 

 of the last whorl, and in the upper whorls being smooth, and the 

 peristome thicker ; it is in all respects a smaller shell. 



Notes on a collection of geological specimens collected by William 

 M acle ay, Esq., F.L.S., President of the New South Wales 

 Linnean Society, Sydney, from the coasts of New Guinea, 

 Cape York, and neighbouring islands — by C. S. Wilkinson, 

 Government Geologist. 



I have lately examined a small collection of geological specimens, 

 brought from the coast of New Guinea, by the President of this 

 Society, Mr. William Macleay, and which were collected by him 

 when on his recent tour of exploration in the Chevert. 



These specimens consist of — 



1. Quartz porphyry (Palaeozoic), from Cape York, found 



underlying beds of Tertiary ferruginous sandstone. 



2. Vesicular basalt and brecciated volcanic tufa (Upper 



Tertiary), from Darnley Island. 



