OCR Text |
Show 92 DR. G. S. BRADY ON FRESHWATER ENTOMOSTRACA. [Feb. 2, length, anterior extremity obtuse, scarcely rounded, posterior rounded off and rather wider than the front. End view subcircular. Surface smooth, cream-coloured, with transverse black bands after the manner of C. vidua. Length -fa of an inch. Hab. Condong, Tweed River, N e w South Wales (Mr. T. Steel). Genus NOTODROMAS, Lilljeborg. (Newnhamia, King, 1855, Pap. Proc. R. Soc. Van Diemen's Land, vol. iii. pt. 1, p. 67.) NOTODROMAS FUSCATUS, n. sp. (Plate X. figs. 4-6.) Shell, seen laterally, subtriangular, height equal to three fourths of the length, extremities very broadly rounded, the anterior somewhat the narrower of the two, dorsal margin excessively arched, highest a little behind the middle ; ventral nearly straight; seen from above, the outline is ovate, scarcely twice as long as broad, tapered and acuminate in front, rounded off behind. Surface of the valves somewhat rough and furfuraceous, colour brownish, with darker cloudings. The ventral aspect of the shell is ribbed almost exactly as in N. monachus ; the " ocular" tubercle is large and distinct; by transmitted light the shell is seen to have a polygonal reticulated structure, and the reticulations are visible also by reflected light on the anterior portion of the valves. Hab. At Condong, with the foregoing species. This is very much less tumid and less angular in outline than Newnhamia fenestrata, King, and its lateral outline differs in the same way from Notodromas monachus, Miiller. Genus CANDONA, Baird. 1. C A N D O N A LUTEA, King. (Plate X. figs. 7, 8 ; &? Plate VIII. figs. 10, 11.) Candona lutea, King, 1855, Pap. Proc. R. Soc. Van Diemen's Land, vol. iii. pt. i. p. 67 pi. x. K. Male. Shell, seen from the side, subreniform, depressed in front, greatest height near the posterior extremity and equal to half the length ; anterior extremity narrow and well rounded, posterior wide, obliquely rounded ; dorsal margin forming a flattened arch, sloping with a gentle curve to the front, and abruptly backwards, ventral sinuated in the middle ; seen from above, compressed, ovate, about thrice as long as broad, gently tapered towards the front, which is subacuminate, rounded off behind. Shell smooth and polished, pellucid, white or straw-coloured. Length -^ of an inch. Hab. Condong, with the foregoing species. The shell figured in Plate VIII. figs. 10, 11, occurred in the same gathering, and possibly may be the young of C. lutea. 2. CANDONA TENUIS, n. sp. (Plate X. figs. 9, 10.) Shell elongated, compressed, reniform ; seen from the side it is at least twice as long as broad, the greatest height being a little behind the middle, extremities rounded, dorsal margin boldly arched, ventral |