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STUDIES ON AUSTRALIAN MOLLUSCA. Part XII. 

 By C. Hedley, F.L.S. 

 (Plates Ixxvii.-lxxxv.) 

 (Continued from Vol. xxxviii., p.339.) 

 Leda dasea, sp.nov. 

 (Plate Ixxviii., figs. 7, 8, 9.) 

 Shell rather solid, inflated, trapezoid-ovate, rostrum short and 

 upturned. Sculpture : the entire shell is over-run by fine spaced 

 threads, concentric in early youth. These become oblique in later 

 life, are generally insinuate on the median line, and more abruptly 

 so at the base of the rostrum. Teeth, about twelve on the pos- 

 terior side, and twenty anteriorly. Shell drawn, 6*2 long, 4 high; 

 depth of single valve 2 mm. Another specimen, length 8, height 

 5; depth of single valve 2-5 mm. 



Hah. — I found a few specimens in 1903, on the beach at 

 Karumba, mouth of the Norman River, Gulf of Carpentaria, 

 Queensland. 



This is somewhat the size and shape of L. verconis Tate, from 

 which it is readily distinguished by the oblique sculpture and 

 blunt rostrum. 



It is worth mentioning here, that the name of Leda inopinata, 

 bestowed on a recent Sydney shell in the " Challenger " Report, 

 was lately repeated for a French Tertiary fossil by Mr, Coss- 

 mann.* Also that Leda ramsayi, another Sydney species dis- 

 covered by the " Challenger " Expedition, was reported as a 

 Pliocene fossil from Japan by Mr. Yokoyama.f 



Leda electilis, sp.nov. 

 (Plate Ixxviii., figs. 10, 11.) 

 Shell rather solid, inflated, nearly equilateral, elongate with a 

 spout-like rostrum. Colour uniform pale bufi". Beak prominent. 



*Cossraann, Bull. Soc. Nantes, 8er.2., v., 1908, p. 189. 

 t Yokoyama, Journ. College Science, Tokyo, xxxii., 1911, p.6. 



