476 STUDIES ON AUSTRALIAN MOLLUSCA, X., 



But I have taken C. toreuma only at Green, Fitzroy, and North 

 Barnard Islands (i.e., about 17° S. lat.). Though alike in size, 

 colour, shape, and sculpture, they are immediately separable by 

 the lunule, that of G. toreuma being comparatively narrow and 

 shallow, but that of G. embrithes broad and deeply excavate. 

 Smith* united Venus jukesi Desh., and V. sculpta Desh., to the 

 earlier V. toreuma Gould, and described the yet unnamed 

 embrithes as a form of it. Hidalgo,f on the contrary, divided 

 G. toreuma from G. jukesi. His reference to Reeve's figures 

 conveys the impression that the deeply lunuled shell is C. toreuma, 

 and the shallow lunuled one is G. jukesi. But an excellent figure 

 of C. jukesil overlooked by all authors, when contrasted with the 

 figures of Gould, and of Melvill and Standen seems to me to 

 support the union of G. jukesi to C. toreuma. 



In describing C. embrithes, Melvill and Standen merely state 

 that it was " Hitherto mixed up and confounded with G. tor- 

 euma,"% without reference to any previous appearance in literature 

 of their novelty. 



Cuna pisum, n.sp. 



(Plate ix.,figs.26-27.) 



Shell large for the genus, solid, inflated, globose-cuneate, in- 

 equilateral, produced posteriorly. Both lunule and escutcheon 

 large, deeply impressed, smooth. Umbo usually eroded, bluntly 

 rounded, approximate, Colour dull white. Sculpture : about 

 thirty irregular concentric flat-topped ridges parted by narrow 

 interstices. The anterior part of the valve carries half a dozen 

 rays apparent through inflection of the concentric ribbing and 

 gradually fading posteriorly. Ventral margin sharply finely crenu- 

 lated. Length, 6; height, 5; breadth of conjoined valves, 4 mm. 



One example dredged in 8 fathoms off Green Point, Sydney 

 Harbour, by J. Brazier. 



* Zool. Coll. Alert 1881, p.93. 

 f Mem. Acad. Cien. Madrid xxi. 1903, p.290. 

 Deshayes, Proc. Zool. Soc. 1853 (1854), Moll. pi. xix., f.2. 

 § Journ. Linn. Soc. Zool. xxvii. 1899, p. 195. 



