394 



THE INVERTEBRATA 



t-car. 



bri.- 



th.lfed. 



Fig. 271. 



Fig. 270. 



Fig. 270. Maxilla of Mysis. bri. bristles used in straining out the food; 

 en. endopodite; ex. exopodite; 1-6, segments. 



Fig. 271. Part of a transverse section through the hinder region of the head 

 of Hemimysis. After Cannon and Manton. hri. bristles of the fringes on the 

 maxillae by which food particles are strained out ; car. the edge of the cara- 

 pace; hd. head; mx.' base of maxillule; mx." section of maxilla; th. 1, section 

 of first thoracic limb; th. i, ed. section of endite of first thoracic limb. 



The arrows show the direction of the currents. Note that the outgoing 

 water from the food current joins that of the respiratory current, which comes 

 down from under the carapace. 



car. 



an'. 



Th.4 



Th.6 



Fig. 272, Female Diastylis stygia. After Sars. ab. abdomen; ab.6, appendage 

 of the sixth somite of the abdomen; an.' first antenna; car. carapace; gill, gill 

 borne on first maxilliped and seen through the carapace; Th. free part of 

 thorax; Th.4-Th.8, fourth to eighth thoracic limbs. The male has pleopods 

 and long antennae. 



