PI D- Dorsal view of pleon, magnified three diameters. 

 Fl. L. Lateral view of pleon, much more magnified, 

 a.s-^ a.i. First and second antennae- 

 ep-, l.s. Epistome and upper lip. 

 mx. I, nix- 2. First and second maxillae- 

 mxp. Maxilliped. 

 gn. I. First gnathopod- 

 prp- 5. Fifth peraeopod. 



pen- Male organs from seventh segment of perseon. 

 pip. 2^ 3, 5- Second, third, and fifth pleopods. 

 The separate appendages all drawn to the same scale, magni- 

 fied about twelve and a half diameters. 



Plate 15 a. 

 Crossophorus africanus. 



app. V. and c. 1. Hind portion of a specimen with eggs, in 

 lateral view, showing the vermiform appendage directed upward, 

 the caudal lamina pointing downward, and above this on the 

 right the two genital tubercles- 



ov. I. Large egg, in lateral and dorsal view^ from small speci- 

 men. 



a.i. Second antenna from the large egg. 



ov. 2. Egg from a large specimen which was infested with well- 

 developed female and larvae of Cyproniscus. 



cr. Crystals forming flattened layers within (he valves of a 

 large ovigerous female; many of the crystals carrying setules and 

 plumose setce evidently stripped from the organs of the 

 Ostracode. 



All the above are much magnified representations. 



Plate 15B. 

 Cyproniscus crossophori- 



n.s. Natural size of the larva, figured in dorsal view at the 

 middle of the plate, and also natural size of the developed female, 

 figured on the left hand below, much less highly magnified, with 

 a larva beside it to the same scale- 



CV. Cephalon of larva in ventral view. 



a.s.^ a-i. First and second antennae. 



gn. 2. Second gnathopod, in attachment to its segmlent, with 

 ventral view of first segment and part of third. 



prp. 5. Fifth peraeopod. I 



pip. I. First pleopod- ' 



T. urp. Telsonic segment in dorsal view^ with the uropods. 



