BY "W. F. PETTERD. 77 



I have submitted examples to several of the recognised 

 conchological authorities, and all are of opinion that an 

 entirely new genus is absolutely necessary in which to place it. 

 I have very great pleasure in naming the genus after my 

 friend, Mr, John Brazier, F.L.S., of the Australian Museum, 

 Sydney, N.S.W., a gentleman well-known in the scientific 

 world, and one who has done an enormous amount of work 

 in the Zoological field of Australia. 



ASSIMINEA BICIJJCTA. Jl. SJJ. 



Plate 11. Fig. 4. 



SJiell small, conical, thick, brownish liom, banded with 

 dark brown, covered, a thin epidermis ; lohorls 4^, convex, 

 obtusely angular near the base. Aperture, ovate, pointed 

 above, bands of colour clearly showing witliin, columellar with 

 thick shining callus deposit below, thin above at junction of 

 labrimi. Operculum, dark homy. 



Length, 4 ; hreadtli, 3 mill. 



Hahifat— Month of the River Don, JN'orth Coast (Rev. Mr. 

 Hull), obtained living on stones and grass within the influence 

 of the tide in company with Tatea rujllahris. The 

 bi-coloration of this specie is very constant, which, with its 

 small aperture, constitute its most notable characters ; in both 

 respects it differs from the A. Tasmanica, of Tenison-Woods 

 (plate II., fig. 2), as it is not so largo or globose as A. 

 Australis, Tate (lAaia III., fig. 10). The last mentioned has 

 been collected by Mr. C. E. Beddome, at Kelso, near the mouth 

 of the River Tamar, ou the mud flats. 



In the " Check List of the Fresh Water Shells of Australia" 

 the A. Tasmanica is given as a svnonym of A. r/ranum, Menke 

 (Moll, Nov. Holl., 1843). 



Hydrobia turbinata, ;/. sp. 



Plate 11. Fig. 3. 



iS7i^// small, turbinately elongate, thin, brownish green, often 

 much corroded, subperforate. WJiorh 6A, very convex, 

 suture deep. Aperture small, ovate, continuous, columellar 

 margin a little reflcxed, outer lip thin, acute. Operculum 

 horny. 



Lefigf/i,A:; breadth, \\ mill. 



Habitat. — River Styx, near Falmouth, East Coast iiud 

 George's River (Mr. A. Simpson). 



This shell was collected in great abundance at the first 

 locality by Mr. A. Simi)son ; it was living in almost salt water 

 ith true marine species. I have placed it in he genus 



