695 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.