150 c. ishikaWa* 



The freshly laid eggs are oval iu shape ; its ceutral oil globule of a 

 light yellow, and its dentoplasen of a light bluish green. 



The colour of the animal is biood-red, that of the shell much 

 lighter, sometimes yellowish ; and the intestinal contents are of sepia- 

 brown. 



Gamogenetic female (Fig. 4). 



Just as in the preceding species, the formation of the ephipium 

 causes the marked change in the shape of the dorsal border of the 

 carapace, which now becomes slightly elevated behind the heart-region, 

 and shows a constriction at the dorsal end of the fornices. Behind this 

 constriction the dorsal border passes nearly straight to the spine of the 

 carapace, which is more straight and is of an even breadth. The 

 spinules on the dorsal border of the carapace reach also much further 

 forwards than in parthenogenetic females. The two anterior of the four 

 dorsal processes of the tail are relatively smaller. 



The general shape of the ephipium is like that of the preceding 

 species, but its dorsal border is slightly more straight. Both its outer 

 and inner envelopes are also covered with hexagonal meshworks, except- 

 ing a narrow border. 



The gamogenetic egg is elliptical in shape, its longer diameter being 

 twice as large as its shorter diameter. The two eggs lie as usual, 

 parallel to each other and one after the other, with their long axis at 

 right angles with the dorsal border of the ephipium. 



The colour of the animal and of the shell is similar to that of the 

 parthenogenetic female, perhaps a little deeper ; that of the ephipium, 

 sepia-brown, and the colour of the freshly laid gamogenetic egg is by 

 transmitted light deep bluish green. 



By the exuviation of the animal the ephipium sinks to the bottom 

 of the water. 



Male (Fig. 3). 



The male is as usual nearly tvi^o-thirds in length that of the 

 gamogenetic female. 



