BRANCHIOPODA 



357 



features of such limbs but are remarkable for the distal position of 

 the exopodite and for the very long basal endite, which may be 

 simply the gnathobase (p. 337) but probably represents also the 



th.M 



h. a I. 



md. 



Fig. 236. A female of Chirocephalus diaphanus. The animal is seen from the 

 right-hand side in the morphological position : normally it swims upside down. 

 ab. I, ab.y, first and seventh abdominal somites; al. alimentary canal; an/ an- 

 tennule; an." antenna; e. compound eye; e.' median eye; egg p. egg pouch; 

 h. heart; Ibr. labrum; Ir. liver; 7nd. base of mandible; nk.on. neck organ; 

 ov. ovary; rayn. ramus of caudal fork; tel. telson; th. 11, eleventh thoracic 

 limb; th. 12, twelfth thoracic somite. 



nk.on. 



>an: 



Fig. 237. Fig. 238. 



Fig, 237. A front view of the head of a male Chirocephalus. an.' antennule; 

 an." antenna; e. compound eye; e.' median eyQ\ fr.ap. frontal appendage; 

 nk.on. neck organ. 



Fig. 238. A thoracic limb of Chirocephalus, mounted flat. br. branchia; 

 bri. bristles which strain out the food; ep. epipodite; ex. exopodite ; ^6. flabel- 

 \\xra\pr.ep. proepipodites ; 1-7, endites. 



second endite. The fringe of long bristles on the median border 

 is, in life, directed backwards, roughly at right angles to the main 

 plane of the limb. The twelfth thoracic somite, upon which are 



