90 DE. G. S BEADY ON MTODOCOPA OBTAIJJED 



margins evenly arched ; beak wide, obtusely pointed, notch deeply excavated ; posterior 

 extremity wide, produced in the middle into a broad, bifid prominence. Seen from 

 above the outline is subpentagonal, with parallel and almost straight lateral margins, 

 which in front of the middle converge sharply towards the subacute anterior extremity; 

 posterior extremity very wide, scarcely narrower than the widest part of the shell, 

 truncated, the outer angles forming two backward-pointing spines, obtusely mucronate 

 in the middle. Surface of the shell smooth ; behind the middle, on the lateral aspect 

 of each valve, there is a very large, acutely lancet-shaped spine which points directly 

 backwards, its point reaching almost as far as the hinder border of the shell ; just 

 within the dorsal margin, above the base of the larger spine, is a much smaller one of 

 similar form, but pointing upwards. Colour brown, the spines almost black at their 

 apices. Length 1-4 millim. 



Animal unknown. 



One specimen from a depth of 7 fathoms, Flinders Passage, Sept. 8 th, 1874 — 

 ' Challenger ' Expedition. 



Cypeidina (■?) SQUAMOSA, D. sp. (Plate XVI. figs. 10-12.) 



Shell very thin and membranaceous : seen from the side almost circular (fig. 10), 

 the height equal to about three-fourths of the length ; anterior extremity broadly 

 rounded, the beak wide and almost rectangular, notch deep and narrow ; posterior 

 extremity rounded above the middle, below the middle forming a wide truncate 

 prominence ; dorsal and ventral margins boldly convex. Shell marked throughout 

 with a reticulated pattern as of imbricated scales (fig. 11). Caudal laminae (fig. 12) 

 bearing only three ungues, which are strongly curved, the first being very small, the second 

 about thrice as long, and the third twice as long as the second. Length 0'9 millim. 



One specimen only of this species has been noticed ; it occurred in a gathering from 

 the Eastern Archipelago the precise locality of which was not stated. Only fragments 

 of the soft parts were recognizable, and its position as a Cypridina must be looked upoa 

 as provisional only. 



Genus Philomedes, Lilljeborg. 



Philomedes agilis, Thomson. (Plate XVI. figs. 13-16.) 



1878. Philomedes agilis, Thomson, " On the New Zealand Entomostraca," Trans. New Zealand 

 Institute, vol. xi. p. 257, pi. xi. fig. C. 8a-e, D. 1 a-g. 



Male. — Shell, seen from the side (fig. 13), oblong, ovate, greatest height in the 

 middle and equal to about two-thirds of the length, beak obtuse and only slightly 

 produced, notch very shallow, anterior extremity narrow and somewhat angular, 

 posterior broad and well rounded ; dorsal and ventral margins equally arched ; the 

 dorsal margin, especially in its posterior half, irregularly emarginate and presenting an 



