THE SNAPPING TURTLE LAY EGGS IN ONE SEASON? 147 



of eggs to ripen. It would be interesting to know how Chelonia in the 

 Tropics behave in this matter. 



Science College, Imp. Univ. Tokyo. 

 Oct. 14, 1895. 



Phyllopod Crustacea of Japan. 



By 



C. Ishikawa. 



(With PL XXI.) 



DAPHNIA WHITMANI.* 



Parthenogenetic female (Fig. 1). 



The body is rather large, attaining the length of 2.7 mm. of which 

 the spine of the carapace alone measures 0.3 mm. It is also high, and 

 compressed, the highest part being more than half the length of the 

 body, and its greatest breadth a little over one-fourth of it. 



The head is marked off from the carapace by a very shallow im- 

 pression. Its dorsal border is evenly curved, its frontal edge rather 

 conspicuous and its ventral side concave behind the eye, and is produced 

 into a rather pointed rostrum, usually facing downwards and backwards. 



The fornix is prominent, beginning above the eye and ending at 

 above the middle portion of the dorsal side of the animal. Behind the 

 base of the antennae it makes a short blunt angle as in D. Morsei or 

 in D. pulex. 



In the dorsal aspect (Fig. 2;, of the head appears as an equilateral 

 triangle, the two sides of which being broadly convex, and its apex 

 formed by a less prominent ridge of the head than in D. Morsei. 



* Dedicated to my second teacher in ^oology. Prof. C. O. Whitman now of Cliicago 

 University, U. S. America. 



