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 

 geiK-ral surface of the body, and the only respiratory organs are 



Km. 4M."i. Orcbestia cavimana, male, a, eye; ], aiiterinule ; an, antenna; <"<, anterior 

 aorta; nn/i, posterior aorta; '//), ventral nerve cord; lir, gills; ('+/, cej ihalo thorax ; </. , vas 

 deferens ; til, rectum ; it, lirain ; /;, heart ; In!, intestine ; kf. niaxillipede ; /. digestive glands ; 

 ", gullet; /< 7 /) ,", alidi.miiiial segments; xm, stomach; tal, intestinal eiecum ; vs. vesicula 

 seminalis ; // VIII, free thoracic segments. (From Lang's Comparativi Anatomy, after 

 .\' l -ky.) 



the bracts and flabella of the appendages. In the stalked Barnacles, 

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

 are supposed to be rudimentary gills. Amongst the Malacostraca, 

 also, the Phyllocarida and many Schizopoda have no specialised 



