1895. No. 8. SOUTH-AFRICAN ENTOMOSTRACÀ. 35 



being continuous with the anterior edge, whereas, behind, it slopes rather 

 steeply to the posterior extremity. Tiie \-entral margin appears nearly 

 straight, though a slight concavity may be found in the middle. The an- 

 terior extremity is quite evenl}' rounded, whereas the posterior one ap- 

 pears more blunted, with a shallow sinus above. 



Seen from above (fig. 4 b), the shell appears rather narrow, of an 

 oblong cuneiform shape, with the greatest width behind the middle and 

 not nearly attaining half the length. The anterior extremity appears 

 considerabh' narrowed, tapering to a somewhat twisted, almost rostriform 

 point, whereas the posterior one is broader and more obtuse. 



The valves are very unequal, the left one being much the larger and 

 considerably overlapping the right at both extremities, as well as along the 

 ventral face. The left \-ah'c has the edges quite smooth, and surmounted, 

 both anteriorly and posteriorly, by a narrow hyaline rim, ^vhereas the 

 right one exhibits a closely set row of small tubercles along the inferior 

 part of the anterior and posterior edges, which, thereby, acquire a finely 

 crenulated appearance. The inner duplicatures of the valves are not 

 very broad, though distinct at both extremities. 



The surface of the shell is perfect)}- smooth and polished, being only 

 clothetl with delicate hairs towards each extremity. 



The several appendages agree, on the whole, in their structure rather 

 closely with those in C. incongrucns and sydneia. 



The caudal rami (fig. 4 c) are comparatively small, sublinear in form, 

 and have the outer claw scarceh- half as long as the ramus. 



The colour is a beautiful golden yello\\- turning to orange, with a dark- 

 patch across the back, and extending, down the sides, towards the muscular 

 pits. From this patch issues on each side, immediately above the muscular 

 pits, a very conspicuous dark band extending obliquely backwards, and 

 caused by the underlying cœcal appendage, the walls of which are 

 clothed with \ex\- dark coloured cells. The o\arial ova, contained in the 

 body, shine through the shell with a vivid reddish orange hue. 



The adult male (fig. 4 a~ is somewhat smaller than the female, mea- 

 suring, in length, only 1,32 mm. 



The form of the shell is but little different from that in the female, 

 though, on a closer comparison, it is found to be somewhat more pro- 

 nouncedly reniform, with the dorsal margin nearly straight in the middle, 

 and the posterior extremity more regularly rounded, without the shallow 

 sinus that occurs in the female. Male specimens are, moreover, easily recog- 

 nized by the spermatic ducts shining through the shell, and exhibiting the 

 usual arrangement. 



3* 



