•20 C. TSTTTKAWA, PTTYLLOrOT) rRr^^TAfKA. 



teen liit,iL'-lil<o I'oatliorod si^tiv on ono sid.^, and with clovon ^^toutci- onos on tlio 

 other ; tho tliird with cloven and six; the fonitli witli inne and seven; the 

 iil'tli with ten and nine ; and the sixth is half as small as the fifth and is beset 

 ^vith tWidve feathered seta' only, 'i'he tlahellinn of this appendage has thirty 

 leathered seta\ and its npper end very small. Tn all the succeeding legs the 

 Hrst endite remains relatively of large size, while the sixth endite gradually 

 enlarges up to the sixteenth leg, the seventeenth (Fig. '.\) bearing only five 

 endites, and the eighteenth (Fig. 4) four. 'Fhe Flabellum and the branchia 

 are found till to the last. The ninth and the teiith with ovigers. 



The post abdomen (h^ig. 5) with seventeen s]Mnes of unequal length on 

 its dcn'sal side, the first two of which being nearly three-fourth the length of 

 the caudal s))ip.e which is quite straight. 'J'he two feathered seta- on the 

 doi-sal side of the jiost-abdomen arises between the fifth and the sixth spines, 

 and are proportionally longer than in the preceding species. Th.e caudal 

 a-|)pendage is nearly of similar shape, l)ut is perhaps a little broader and with 

 twelve seta- on the basal half of the inner doj'sal side. 



The antero-posterior diameter of the carapace is about (> nmi. ; the 

 doiso-ventral, 'A mm. ; and the dextro-sinistral. 1.5 nun. 



About sixty specimens of this species are found in the l)ottle containing 

 Tjijnnadia nipponica brought to me by ]\rr. Xakagawa, who fished them 

 in the same pool in Xik-k'n in which he found the other species. Xot 

 a single male is also to ))e found among them, l>ut as many of the specimens 

 carry eggs under the shell, it is not to be d(~)ubted that the present colony is 

 a parthenogenetic; one, the question ^\'hetiier the cyclic reproduction of a 

 l)arthenogenesis and a gamogenesis here takes ])l;ice is also to be answered 

 by futui'e investigations. Seeing that this species is closely allied with the 

 preceding one, its ])arthenogenetic reproduction is of great interest, since the 

 Kugenuma species li\ing in tem])orary ]iools of water reproduce in all 

 probabdity oidy by gamogenesis.* 



* S.'i' A. Wt'isniMini : I'l'ih-ii'^c znr Xjitiirn'i'sfliii-litc 'L r I )apliiifiiil'>ii, Tii'ipzit;', ISTt'i-T'J. 



