C. ISHIKAWA, PHYLLOPOD CRUSTACEA. 9 



The antero-posterior diaiuetir of the carapace, 6 mm.; the dorso-ventral 

 ^diameter, 5 imu.; and the dextro-sinistral diameter 2.5 mm. 



Female. — Shell nearly similar to that of the male in lateral aspect, 

 but is much broader, when it is seen from the dorsal side. The 

 dorsal view of the rostrum is nearly similar to that of the male, but 

 forms an irregular curved outline in front instead of a straight line of the 

 male. The front edge of the rostrum is, moreover, not thick, but is flat- 

 tened, so that the side view is quite different from that of the male (compare 

 fig. 6 and 7). The first antennae (fig. 7 At.) is proportionally smaller than 

 in the male, but the second is quite similar in both the sexes. Twelve pairs 

 of legs, the seven anterior being provided with gill as in the male ; the eighth 

 pairs with six endites and with an upper and a lower ends of the flabellum ; 

 the ninth is similar to the eighth, but the upper end of the flabellum 

 elongated and froms an oviger ; the tenth is similarly constructed as the 

 ninth, the lower end of the flabellum, however, wanting. The eleventh and 

 the twelfth consist only of six endites, the flabellum being absent. The first 

 endite is proportionally long but narrow in anterior legs, while it becomes 

 gradually shorter but broader posteriorly. 



The terminal segment of the body is broader in lateral view than in the 

 male (comp. fig. 10 and 11), and the lower side of the ventral lobe not 

 indented. 



The antero-posterior diameter of the carapace, 6 mm.; the dorso-ventral 

 diameter, 5 mm.; and the dextro-sinistral diameter, 3 mm. 



The species was first discovered by myself in the paddy fields for the 

 cultivation of Nelumbium roots in the north-eastern end of the city of 

 Tokyo, the district being known as Yoshiwaratambo, in the summer of 

 1892. The same species was gifted to me by Mr. Torazo Sakai, a very 

 good collector and observer in Soma, in the province of Shimosa. To this 

 gentleman, I owe very much also, many other specimens of Phyllod crusta- 

 ceans as will be mentioned in sequel. All the Yoshiwaratambo specimens I 

 collected are nearly of equal size, while those sent by Mr. Sakai are of two 

 different sizes, the larger measuring 7 mm. in length and the smaller 6 mm. 

 (comp. figs. 12 and 13). It is very interesting to know that the females o^ 



