754 riKjF. t!. (». SAits ox l'^^"}'^' 



Family C Y tji k ii i d .k. 

 Genus 7. Limxicytiiere Brady. 



Remarks. — Of this genus, Avliich exhibits so close a relationship 

 to true uiiu-iue Ostracodii, tour or live northern species have Ijeen 

 described, all of which are found exclusively in freshwater ponds 

 or lakes- No species of this genus is, however, as yet known 

 fi-om the Southern Heniispliere. In the Ostracod material of the 

 Tanganyika Exjiedition one species refe)a1jle to this genus is 

 represented, and another nearly related African species is known 

 to me, having been found in a sauiple taken by Dr. Piuceil from 

 H freshwater pond in Cape Colony. 



29. LiMXicYTiiEUE OBTUSATA, sp. n. (Plate LXXIII. figs. 8-14.) 

 Specific Characters. — Female, Shell rather tumid ; seen laterally 

 (fig. 8) of regular oblong-oval shape, greatest height scarcely 

 attaining half the length, ])oth extremities ol^tusely rounded and 

 of about same l)readth ; dorsal margin straight and horizontal, 

 forming in front, just above the eye, an abrupt angular bend, 

 venti-al margin very slightly concave in front of the middle : 

 seen dorsally (fig. 9) irregularly subovate in shape, lieing con- 

 spicuously constricted in front of the middle and bulging behind, 

 *freatest 'width almost attaining two-thirds of the length and 

 occui'ring in the posterior part, anterioi- extremity acuminate, 

 posterior blunted. Dorsal face of shell somewhat fornicate, 

 ventral flattened, the greatest convexity of the shell occurring far 

 below. Valves rather thin and flexible, being very little calcified 

 and slightly unerpial, the left valve overlapping the right a little 

 in fiont, but scarcely behind. Surface of shell of a dull appear- 

 ance being distinctly reticulated, and clothed at both extremities 

 with stiff hairs, more densely croAvded along the anterior one. 

 Muscular impressions in the centre of each valve (fig. 10) four in 

 number and arranged in a regular vertical series. Eye single, 

 not as in the marine Cytherida-, double. Superior antennre 

 (fig. 11) rather stout, being composed of six well-defined joints, 

 the first two of which are much the largest and forming together a 

 geniculate bend ; sette of the tei'minnl part short, partly spiniform. 

 Inferior antenn.ie (fig. 12) 4-articulnte, without any trace of 

 natatory setse, but with a strong defiexed, biarticulate spine 

 issuing from the end of the basal joint and extending beyond the 

 apical claws, the latter com])aratively short and only three in 

 number. Mandibles and maxillae of normnl structure. The 

 three pairs of legs (fig. 13) gradually increasing in length and of 

 comparatively simple structure, each carrying on the end a strong 

 claw, that of hist pair, however, more slender. Caudal lobes 

 (fif». 14) rather broad, and each provided A\itli foui' thick and 

 densely ciliated setfe. 



ijC'iK'th of shell ()■()() mm., height 0-3() mm.. \\u\\\\ O-.'iS nun. 



/iV//?r<r/i-.s-.- This foi-m diU'crs (•()ns[>icuously in the sliaiic of ihc 

 ^ll(■ll t'riini anvof the norllicin species, and more rcscnililcs in this 



