PHYLLOPOD CRUSTACEA OF JAPAN. l5l 



The dorsal border of the head in front of the coecal processes is 

 shghtly indented, bat is more elevated posteriorly than in the female, 

 and passes without any great curvature to the dorsal border of the 

 carapace which is also more straight. The lower border of the head 

 below the eye is nearly straight, but makes an abrupt curve with a 

 rather broad rostrum. 



The anterior edge of the carapace is also differently shaped as that 

 of the female, its basal portion being less indented than in tkat sex. It 

 forms a prominent angle with the iijferior border as usual ; beyond this 

 projection it runs in nearly a straight line to about the middle point of 

 the entire border of the carapace, and passes gradully to the posterior 

 border and to the spine. This spine is directed upwards as in young 

 females, and is also relatively longer. The anterior half of the lower 

 border of the carapace is beset with minutely set hairs. Beyond these 

 hairs the free border of the carapace its provided with denticles as in the 

 female. 



Both the eye and the ocellus are relatively much larger than in the 

 female, the eye occupying nearly the entire anterior cavity of the head, 

 and is of the same size as or perhaps a little larger than, of the female. 

 It is thus shghtly larger than in the male of D. Morsei, and is con- 

 spicuously larger than in D. pulex or in D. curvirostris,* but is nearly 

 of the same proportion as that of D. Lumholtzii figured and described 

 by G. 0. Sars.t 



The first antenna (Fig. 8 a.) is larger than in D. Morsei, its slender 

 terminal portion being longer than its basal portion, and ends in a more 

 curved hook. 



The first pair of legs (Fig. 3 b.) show the usual structure with a 

 developed hook and with a rather long filament whose posterior third is 

 minutely feathered on its concave side. 



* See Figs. 5 and 6, 7 and 8 Taf. Ill of E. Eylmanu's " Beitmg znr Sysfcematik der 

 europiiischen Daphniden," iu Berichten der Naturforschenden Gesellschaft zu Freibnrg 

 i. B. Bd. II. 1886. 



t G. O. Sars : On some Anstrlian cladocera, raised from Dried Mud, in Christian ia 

 Videnskabs-Selskabs Forhandlinger 1885. 



