Phyllopod Crustacea of Japan. 

 By C. Ishikawa. 



LIMNADIA NIPPONICA, n. spec. (PI. VII. Figs^. O-IO). 



Shell valves thin, very transparent and shining, edged with sepia colour 

 along its dorsal border ; oblong oval, about two-third as broad as long, with 

 only two or three lines of growth ; the dorsal border less curved than the 

 ventral. 



'J'he niatrix of the shell (Fig. 7) appears as star-shaped figures with a 

 nucleus at the centre of each as has been shown by Clans* in an Australian 

 species, Liinnadia Stanleyana. These figures do not reach to the fi-ee ventral 

 border of the shell, )jut stop at a shoL-t distance from it, leaving a free clear 

 margin destitute of any markings. A number of nucleated cells (l)lood- 

 corpuscles) are seen suspended in the plasma between these trabecular con- 

 nective tissue. 



In the head the " Haftorgan " of ordinary size. The first antenna 

 shows no segments, and reaches nearly to the tip of the stem of the second, 

 and having live distinct lobes on its anterior surface, each lobe being beset 

 with numerous sensory ]^apilla. The second antenna has its upper flagellum 

 formed of eleven, its lower of twelve, joints, the last three of which ])eing often 

 united into a single joint, l^'ach joint of l)oth the flagella provided with one 

 to five strong spi)ies on the anterior edge, and with one to four long feathered 

 seta^ on the postei'ior edge. The fii-st maxilla shows no structures peculiar 

 to this species. 



'^J.\venty-two pairs of legs. The first endite of the first pair of legs 

 (Fig. 8) with two strong terminal spines each of which beset with nine or 



• * C. Clans: ITelier deu Korperbaii eiiiov nustvaliselioji I,iiunaflia nml lilior das Miimu'lien 

 dt^rsflhon. Zeitsch. f. wiss. Zoalogje B4. 22. 



