OF TWO SPECIES OF CYPRIS. 239 



failed to find it. I have come to the conclusion that this is the 

 copulatory season, as during this time the spermatophore is filled 

 with spermatozoa. My stock-bottle, which I filled last December, 

 still contains some male specimens of C. niinufa, but at those 

 intervals when the pond was frozen over, or during the summer 

 months when it was dry, I have drawn specimens from my stock- 

 bottle for investigation, and have found them not exactly destitute 

 of spermatozoa, but inert and in a very morbid condition. 



What has been said above of C. cincrea with regard to the 

 position of the generative organs and the mucous glands applies 

 also to C. ininufa. It will be seen, on reference to Plates XXII. 

 and XXIII., Figs, i and 9, that the chelae are much broader and 

 more transparent in C. nwmta than in C. ciiierea. The bursce are 

 smaller, being about the one-two-hundred-and-eighty-sixth of an 

 inch long and the one-four-hundredth of an inch broad. The 

 intromittent organ is placed a little farther back and lower down 

 in the bursa. It is somewhat globular at the posterior end, but 

 has no elbow. As it descends, it takes a sharp curve round the 

 base of the bursa until its termination points towards the flat edge 

 of that organ. It terminates in a nodule, and has a fairly-wide 

 aperture. I have traced the spermatozoa from the arched canal 

 down the intromittent organ. Its length is one-eight-hundred-and- 

 thirtieth of an inch and diameter one-three-thousand-three- 

 hundredth of an inch. On the second foot we get a different 

 formation of the central seta2 to that given by Brady. That the 

 spur-like formation is the more accurate will be seen on reference 

 to Fig. 10. I have always found the carapace to be hispid and 

 the second maxilla chelate. It is twenty-three years since Brady 

 added C. cinerea as a new species to his monograph, and since 

 then until now it appears to have escaped detection. 



EXPLANATION OF PLATES XXII. and XXIII. 



Fig. 1. — Cijpris cinerea, bursa-copulatrix : — a, spermatozoa ; h, arched 

 canal ; c, intromittent organ ; x 595 diam. 

 ,, 3. — Cypr is cinerea: — Stoma of same, x 2,000. diam. 

 ,, 4. — Ditto, spermatozoa: — a, anterior; h, posterior; i/isth inch 

 immersion. 



