716 STUDIES ON AUSTRALIAN MOLLUSCA, xii., 



Blainville's forgotten species will find among them prior names 

 for these also. 



Obtortio lutosus, sp.nov. 

 (Plate Ixxxi., fig. 53.) 



Shell small, subulate. Colour bufi*, spirally banded with 

 chestnut or varying thence to uniform hazel-brown. Whorls 

 eight, slowly increasing, rounded, parted by impressed sutures. 

 First two whorls smooth, fourth sculptured by four narrow 

 elevated spirals; gradually these increase to fourteen on the last 

 whorl. Sometimes these are overridden by rather irregularly 

 disposed, thin radial lamellae which decrease upwards, or the 

 radials may be absent. Aperture ovate, outer lip thin, simple. 

 Length, 3-3; breadth, 1*2 mm. 



Hah. — Beach, Middle Harbour, Sydney(type), and 5-10 fath. 

 Hope Id., Queensland (self). 



This species is close to 0. fulvus Watson, with which, indeed, 

 it may be found ultimately to intergrade, but the form here 

 described seems 'to differ constantly and appreciably by being 

 comparatively narrower, with feebler radials or none, and rounder 

 whorls. 



Petterdiana brazieri Smith. 

 (Plate Ixxxii., fig.55.) 

 . Hydrohia brazieri Smith, Journ. Linn. Soc, ZooL, xvi., 1882, 

 p.269, PI. vii., fig.21 ; Id., Hedley & Musson, Proc. Linn. Soc. 

 N. S. Wales, (2), vi., 1892, p. 563; Amnicola positura Petterd, 

 Journ. of Conch., iv., 1884, p. 159. 



From Eidsvold, Queensland, a series of P. brazieri were for- 

 warded by Dr. T. L. Bancroft, one of which is here figured. This 

 is the northernmost point to which the species has yet been 

 traced. In the south, it has been gathered by Mr. C. T. Musson 

 at Bective, N.S.W., and its western limit, so far known, is 

 Narrabri, where Mr. Musson also collected it. This range, from 

 the head-waters of the Burnett to those of the Peel, and east- 

 wards to the Clarence and Richmond, is in remarkable disregard 

 of present watersheds. It may be that this distribution was 

 attained when the drainage-plan was different from what it is 

 now. 



