'l895- No. 8. SOUTH-AFRICAN ËNTONrOSTRACÀ. 



Seen laterally (fig. 2 a), it exhibits a somewhat irregular oval form, 

 with the greatest height in front of the mitidle, and about equalling ^5 of 

 the length. The dorsal margin has its greatest curvature just above the 

 eye, where it appears almost angularly bent, sloping from thence gently 

 behind, more steeply anteriorly. The ventral margin exhibits, in the middle, 

 a distinct sinus, which, anteriorly, is bounded by a slight expansion. The 

 anterior extremity is rather broad, and somewhat obliquely rounded, 

 whereas the posterior appears more obtuse, and not expanded below, 

 being, as it were, cut off inferiorly. 



Seen from above (fig. 2 b), the shell exhibits a rather regular, broadly 

 oval form, with the greatest width about the middle, and the side- 

 contours evenly curved. The anterior extremity terminates in a rather 

 acute point, whereas the posterior one appears more obtuse. 



The valves are nearh^ equal, though, on a closer examination, the 

 right one is found to project a little beyond the left along the anterior 

 extremity. They both exhibit, in front, a well defined, narrow semilunar, 

 marginal area, which is quite colourless and is surmounted by a thin 

 hyaline rim; and also along the inferior part of the posterior extremity 

 a similar, but much narrower, pellucid border may be traced. The inner 

 duplicatures of the valves are rather broad, especially the anterior one. 



The surface of the shell is smooth, of a dull appearance, without any 

 distinct sculpturing, except the usual small pits. It is, as above stated, clo- 

 thed all over with rather strong, mostly recurved hairs, which along both 

 extremities form a dense fringe. The lucid spots (muscular pits) in the 

 centre of each valve are easily observable, and of the usual number and 

 arrangement. 



The eye is fainth' traced through the shell, occurring, as usual, some- 

 what dorsally in front ol the middle. 



The several appendages are constructed as in the typical species of 

 Cypris, the natatory setae of both pairs of antennas being very long and 

 densely plumose. 



The caudal rami (fig. 2 c) are narrow linear, and, as usual, each armed 

 with 2 slender claws and 2 short bristles. 



The colour of the li\'ing animal is yellowish brown, changing to oliva- 

 ceous, with an irregular dark green patch across the back, extending down 

 the sides to the muscular pits. Behind the latter 2 narrow, dark stripes 

 are seen running obliquely backwards, bounding the place where the 

 cœcal appendages of the intestine lie imbedded within the valves, and 

 above them, the shell generally exhibits an orange hue owing to the 



