CRUSTACEA 



part of the body contains three somites, the third to fifth of the thorax. 

 The cephalothorax and these free thoracic somites are produced at 



an'. 



Fig. 249. Cyclops. A, Dorsal view of female. Partly after Hartog. An. 

 position of anus ; aw.' antennule; «/z." antenna; e.^. egg sacs; e. eye; g.som. 

 compound somite, consisting of the last thoracic (bearing the genital opening) 

 and the first abdominal; od. oviduct; ov. ovary; ram. ramus of caudal fork; 

 5-^^ spermatheca or pouch for receiving the spermatozoa of the male ; ut. 

 uterus: i.e. pouch of the oviduct into which the eggs pass before being shed. 

 B, Ventral view of male. ab. abdomen; an/ antennule; an." antenna; cop. 

 copula; e. eye; Ibr. labrum; ynd. mandible; mx.' maxillule; w^c." maxilla; 

 7nxp. maxilliped; pgn. paragnathum; rant, ramus of caudal fork; tel. telson; 

 th. 2, th. 6, thoracic limbs. 



the sides into low pleural folds. The stalk begins with a short somite 

 which is united to, but distinguishable from, that which succeeds it. 

 The next somite bears the genital openings and is therefore, on the 



