378 



THE INVERTEBRATA 



but Still bearing at its far end the vestiges of the antennules, imbedded 

 in a cement by which it is held fast. The glands which produce the 

 cement are contained in the peduncle, and open on the antennules. 



tgm. 



an! 

 Fig- 255. A view of Lepas anatifera, cut open longitudinally to show the 

 disposition of the organs. From Leuckart and Nitsche, partly after Claus. 

 stk. stalk; cna. carina; tgm. tergum; scu. scutum; an.' antennule; md. man- 

 dible with "palp" in front; mx.' ist maxilla; mx." 2nd maxilla; Th. the six 

 pairs of biramous thoracic limbs; Ihr. labrum; M. mouth; oe. oesophagus; 

 Ir. "liver" coeca; st. stomach; An. anus; ov. ovary; od. oviduct; t. testes; 

 ves.sem. vesicula seminalis; p. penis; cent, cement gland and duct; add. ad- 

 ductor scutorum muscle, which closes the carapace; mtl.ca. mantle cavity, 

 i.e. the space intervening between the carapace and the body. 



The rest of the body is known as the capitulum, and is completely 

 enclosed in the carapace or mantle, a fleshy structure strengthened 

 by five calcified plates — a median dorsal carina, and on each side two 

 known as the scutum and tergum. The scuta are anterior to the terga, 

 that is, nearer to the peduncle. The mantle cavity opens by a long slit 



