BY R. TATE AND W. L. MAY. 



463 



there are one to three threads in the concave interspaces. Ihe 

 sculpture, all over, consists of quincunxially arranged, small, 

 close-set pits as in P. undiilatus. 



Cahditklla elegantula, sp.nov. (Text fig. 14.) 



Shell rotund, slightly oblique, solid, white ; regularly and 

 closely concentrically lamellose-striate, crossed by about 20 

 shallow radial sulci 

 which undulate the 

 concentric raised 

 threads. Inner mar- 

 gin of valves strongly 

 creiiate-dentate. 



Length and width 



Fig. 14. — CardUella elegantida. 

 Comes nearest to C. in fans, which is distinctly costated and 

 traversed by transverse depressed ridges. 

 Black man's Bay, W. F. Petterd. 



Genus Legrandina, Tate & May. 



Shell equivalve, nearly equilateral, oval ; hinge-line curved, 

 famished in the right valve with a prominent cardinal tooth, in 

 the left with two diverging cardinals; several oblique lateral 

 teeth in each valve. Cartilage internal in a pit under the beak. 



Genus proposed for a minute bivalve obtained some years ago 

 from the stomach of a mullet (probably taken in the Derwent) by 

 Mr. W. Legrand, the veteran Tasmanian conchologist. There 

 jippears to be no existing genus that can properly receive this 

 form; its nearest relative seems to be Perrierina, Bernard, from 

 Stewart Island. It is perhaps the most minute Australian 

 pelecypod yet described, and its characters are descernible with 

 difficulty. 



L. Beunardi (PI. xxvii., figs. 98, 99). 



Shell minute, equivalve, nearly equilateral; thin, white, shining 

 and semitransparent, moderately convex; surface ornamented 

 with numerous fine radial ridges, most conspicuous towards the 



