1910.] OSTRACODA FROM TANGANYIKA. 751 



dorsal edge wanting, apical seta ratliei- slevidei-, extending ;iliu().st 

 as far as the distal claw. 



Length of sliell 1'48 mm., height 0'()0 nnii., width 0-41 mm. 



Remarks. — I think I am right in identifying the present form 

 with that described by Bi'ady under the above name, though 

 some small difierences as to the shape of the shell may be found 

 on comparing the figures lieie given with those I'eprodueed by 

 Prof. Brady.' 



Occurrence. — A neai'ly adult female specimen (that here figured) 

 of this form had been mounted by Dr. Cunnington on a slide, 

 together with some other Entomostraca,, According to the lal)el^ 

 they were derived from amongst alg?e taken 23/6/04 in Xkata Bay 

 on the west coast of Lake Nyasa, Another somewhat smaller 

 specimen of the same species, likewise mounted, Avas found in 

 Tangjinyika. the exact locality not being stated, 



Distribatiun. — Natal {Brachj). 



Genus 5. Heterocyprls Clan«. 



Reniarhs. — According to Dr. Vavra, a genus with th« al)ove 

 name was established by Clans in the year 1892, to include 

 the well-known northern species, Cypris inamgruens Ramdohr. 

 Dr. Vavra considers this genus as constituting only a subsection 

 of the genus Cyprinotus Brady. As, however, both these sub- 

 sections are rather well defiued and comprise at present each a 

 number of species, I find it more appropriate to maintain the 

 genus in Claus' form. A third closelj'^ allied genus i^s the one 

 established by the present author as Hemicypris, to include 

 Cypris pyxklata Moniez and allied species. The following species 

 is only provisionally referred to the genus of Olaus, 



26. Heterocypris dubia, sp. n.. (Plate LXXII. figs. 11-14.) 



Specific Characters. — Female. Shell somewhat compressed ; seen 

 laterally (fig. 11) of oval reniform shape, greatest height occurring 

 behind the middle and exceeding half the length, anterior ex- 

 tremity narrowly rounded, posterior much broader and obtusely 

 blunted ; dorsal margin sloping with an even curve to the anterior 

 extremity, abruptly deflexed behind, ventral margin somewhat 

 convex behind and very slightly sinuated in front of the middle : 

 seen dorsally (fig. 12) oblong-oval in form, greatest width equalling 

 about two-fifths of the length and occurring in the middle, both 

 extremities somewhat blunted. Yalves very thin and pellucid, 

 slightly unequal, the left one overlapping the right a little in 

 front and also somewhat along the posterior half of the ventral 

 face; lips of both valves perfectly smooth, without any trace of 

 the crenulation found in other species of this and allied o-enera. 

 Surface of shell smooth and clothed at both extremities with very, 

 delicate hairs. Muscular impressions in the centre of each valve 

 (fig. 13) iixe in number and arranged in the u.'-ual manner 



49* 



