724 STUDIES ON AUSTRALIAN MOLLUSCA, 



now before me, gathered b}^ Mr. J. Brazier from Blackwood Bay, 

 Mount Adolphus Island, and from Warrior Island, both in 

 Torres Straits. Though twice the size I find no specific difference 

 between these and examples from Noumea of Crosse's species. 

 The individual figured is from Warrior Island, and measures 4 - 5 

 mm. in length, and 1*5 mm. in breadth. 



Stenothyra australis, n.sp. 

 (Plate xlviii., fig. 10.) 



Shell small, subperforate, ovate, thin, translucent, very glossy, 

 rather flattened. Colour brown. Whorls five, rapidly increasing, 

 separated by an impressed suture. Last whorl disproportionately 

 large, comprising three-quarters of the whole shell, bulging at the 

 periphery, rapidly and deeply descending for the last half whorl. 

 The earlier whorls are distantly, spirally grooved, the later are 

 quite smooth. The translucency of the shell presents by optical 

 illusion a subsutural band. The strangled aperture is nearly 

 pei^pendicular, regularly oval, bevelled and thickened within. 

 Length, 3 - 68 mm.; breadth, 2-32 mm. 



Hab. — The half dozen examples seen were handed to me for 

 description by Mr. J. Brazier. He procured them from drifted 

 mangrove leaves .on the beach at Bowen, Queensland. 



Type to be preserved in the Australian Museum. 



The genus Stenothyra is not generally known as a constituent 

 of the Australian fauna, and is not included in Prof. Tate's 

 excellent census (Trans. Roy. Soc. S. Aust. xi., pp. 70-81). A 

 description of an Australian species, S. jrustilhim, has, however, 

 been published by Benson (Ann. Mag. N.H. (2) xvii , 1856, p. 

 498) as follows : — 



"Testa vix rimata, minima, ovato-conoidea, politissima, sub 

 lente obsoletissime oblique striatula, albida, translucente, spira 

 convexo-conoidea, apice obtusulo, sutura leviter impressa; anfrac- 

 tibus 4 convexiusculis, ultimo ventricosiore, minime compresso, 

 dimidium testa? non pequante, antice descendente, basi rotundata; 

 apertura subrotundata, marginibus peristomatis acutiuseulis. 



