548 



ZOOLOGY 



SECT. 



may have an excretory function. So-called salivary glands, opening 

 on the labrum, have been found in several genera. 



In most of the Entomostraca respiration takes place by the 

 general surface of the body, and the only respiratory organs are 





Fi<;. 435. Orchestia cavimana, male, a, eye ; j, antennule ; a->, antenna ; <iod, anterior 

 aorta; <iop, posterior aorta; bm, ventral nerve cord; br, gills; C'+I, cephalothorax ; </<., v; 

 defereiis ; ed, rectum ; //, brain ; h, heart ; hd, intestine ; A;/', maxillipede ; /, digestive gland: 

 o;, gullet ; p 1 p 7, abdominal segments ; sm, stomach ; w.l, intestinal ciecum ; vs. vcsicu 

 seminalis ; // VIII. free thoracic segments. (From Lang's Ccni<jHt,-t'n-r Aii.atouin. aft 

 Nebesky.) 



the bracts and flabella of the appendages. In the stalked BarnacL 

 however, there are delicate processes attached to the feet, whicl 

 are supposed to be rudimentary gills. Amongst the Malacostraca, 

 also, the Phyllocarida and many Schizopoda have no specialised 



