304 ME. E. A. SMITH ON THE 



Width 17 millim., length 13, diameter 9|. 



Sah. Victoria Eiver and Port Essington, North Australia. 



The specimens here described were named by Deshajes C. aus- 

 tralis when he compiled the British-Museum Catalogue of Cor- 

 biculidse. They are, however, quite distinct from that species, 

 which is the same as C. nepeanensis of Lesson, and in no way 

 answer the description of C australis. The peculiar colour of 

 the epidermis, the pale lower edge of the interior, and the poste- 

 rior whitish spot are very characteristic features of this species. 

 It is more inequilateral than C. minor, Prime, more coarsely and 

 regularly sculptured and diiferently coloured. Figures 82 a and 

 82 & in the * Conchologia Iconica ' may possibly be intended to 

 represent the variety of this species clothed with a yellowish 

 epidermis. 



The locality given by Sowerby, " Isl. of Timor," applies to the 

 Cyclas australis of Lamarck, and not to Cyrena australis of 

 Deshayes. 



130. CoEBicuLA suBL^viGATA, n. sp. (Plate VII. figs. 30-31.) 



Shell equilateral, transversely regularly ovate, with moderately 

 prominent beaks. Ends subequally rounded, if at all, the ante- 

 rior the more sharply curved. Epidermis pale straw-colour, 

 inclining to brown at the lower margin, and especially on the 

 posterior dorsal slope, where there are one or two irregular cor- 

 rugated ridges radiating in an irregular manner from the apex. 

 Umbones white, not eroded, smooth. Hest of the surface finely 

 striated ; the striae most regular and strongest anteriorly, becoming 

 fainter upon the middle and hinder portions of the valves. Inte- 

 rior altogether white. Lateral teeth fine. 



"Width 20 millim., length 15, diameter 10. 



Hah. Lochinvar, Australia {Dr. Sinclair, R.N.). 



This species may be recognized among the Australian forms by 

 its simplicity of colouring, its smooth white umbones, the general 

 obsolete character of the concentric sculpture, and the one or two 

 wrinkled ridges down the posterior dorsal slope. C. nepeanensis 

 is more regularly and decidedly sculptured, scarcely as equilateral, 

 and exhibits considerable variety of painting. C. laronialis agrees 

 in colour ; but, from Prime's very brief description, that species 

 appears to be of a diiferent form, having the posterior end sub- 

 truncated, whilst there is no trace of such a peculiarity in the 

 present species. 



