loo c. isiiiKAWA. 



The ovisac is long and cylindrical extending to the sixth abdomina 

 segment. Its basal portion is of the same breadth as the abdominal segments 

 from which it arises, bat tapering posteriorly, it ends in a curved trans- 

 verse opening whose dorsal lip is more produced than the ventral. 



I found two colonies of these animals in Japan, one in the shallow pools 

 of rain-water at Kugenuma, Sagami,in company with Eidimnadia Braiieriana 

 described in the February number of this Journal, and the other in the 

 paddy fields at Yoshiwaratambo together with Linmetis hiformis, also 

 described in the January number of this Journal. 



The Kugenuma specimens are of a pale waterly colour, with the second 

 antennse, frontal process, eye-stalk, upper lip, mandibles, the sv\^imming 

 appendages and the lower side of the entire body, of a pale flesh colour, 

 while the caudal appendage is of a beautiful vermilion red. The lamelli- 

 form gland of the ovisac, yellowish ochre, and the eggs of a beautiful green hue. 

 The largest female measured about 13 mm. from the head-end to the tip of 

 caudal appendage, and the largest male nearly 12 mm. 



The Yoshiwaratambo specimens are of a deeper colour in all the parts 

 above mentioned, and are nearly twice as large as the preceding, the 

 largest female measuring 25 mm. and the largest male 23 mm. in length. 

 These two colonies thus differ so much in colour and size of the animals 

 that they appear at first sight to be two different species of Brancliipus, 

 but the comparison of the two, so far as I see, reveals no important 

 point of difference, so that I judge them to be one and the same 

 species. Whether these differences are to be ascribed to the temporary, 

 local influence acting on there two colonies, or whether they are of a con- 

 stant nature, is only to be determined by the cultivation of the two forms, 

 and this, I hope, will be done soon. 



The form of the male-claspers together with the large size of its basal 

 spine, marks it out from both Strcptocephalus and Chilocephalus, causing 

 it to come under the genus Branchlpits, from which it only differs in the 

 non-chitinous nature of the second joint of the male claspsrs. In the form 



