386 SELECTED NOTES. 



this agitation causing a continual whirlpool in front of the mouth ; 

 but possibly this also may be the means of bringing food within 

 their reach. The eye, so far as I can make out, consists of three 

 lenses surrounding a central mass of pigment. Two of their 

 lenses are lateral and one ventral (see Figs. 3 and 6). The eye is 

 lodged, I believe, in a cavity, as is that of Daphnia, and is 

 balanced, I think, in a similar manner. I believe it represents, in 

 fact, the eye of Daphnia. 



A capacious stomach may be seen just below the head, and 

 the intestine extends to the last joint of the abdomen. The body 

 is well provided with longitudinal and transverse muscles, the 

 latter converging in powerful masses towards the basis of the feet. 



The reproduction of these creatures presents some peculiar 

 features. The male attaches to the female a series (four or five) 

 of sausage-shaped bags containing the seminal secretion. These 

 have been termed spermatophores. Some of them are seen in my 

 Fig. I, attached to the base of the abdomen of the female. 

 Another is seen in Fig. 2 while yet within the body of the male. 

 Fig. 8 shows its position while in that condition. It now exhibits 

 a tough cuticular covering, within which lies a delicate sac occupy- 

 ing the whole of its cavity and filled with the spermatic fluid. In 

 this fluid float spermatozoa in great numbers, occupying nearly the 

 whole of the sac, except the extreme end, which is occupied with 

 a collection of brownish granules. Fig. 9 represents one of the 

 spermatophores attached to the abdomen of the female. 



We here see that the sac containing the spermatic fluid has 

 shrunk away from its cuticular investment, and that a cellular 

 structure intervenes between the two. The spermatozoa are much 

 fewer and are collected in a mass at the base of the spermato- 

 phore. The granules still occupy the extremity of the sac. Fig. 7 

 represents a spermatophore just previous to the final expulsion of 

 its contents, which expulsion I was fortunate enough to witness. 

 Only a small remnant of the sac is now seen, and this I soon per- 

 ceived to be rapidly disappearing, carrying the granules with it. 

 When it had entirely disappeared, the few spermatozoa at the base 

 of the spermatophore also quickly foUowed it, and streamed out 

 through the neck into the vulva of the female. 



Strange to say, no cavity appears to be left by the disappear- 



