256 



THE ANATOMY OF INVERTEBRATED ANIMALS. 



mal joints, succeeded by an articulation which is dilated into 

 a sucker, and terminated by an elongated setose joint (Fig. 

 67, A, J5, /). These are the remains of the anterior append- 

 ages of the larva. 



From what has been said, it follows that the fixed end of 

 the peducle is, in fact, the anterior extremity of the body 

 of the Jjepas, and that a Barnacle may be said to be a Crus 

 tacean fixed by its head, and kicking the food into its mouth 

 with its legs. 



Fig. 67.—^. Diagrammatic section of Balanus ; B, of Lepas.—a is placed in the cavity 

 of tlie sac. and lies over tiie labrum ; b, prosoma ; c, carina; c, I, carinn-lateral 

 compartment; I, lateral compartment; r, rostrum; s, scutum; t. tergam: /. penis; 

 (f. eut-formed gland ; h. duct connecting this with i k, cemeiil-dnct and elands; 

 Z', antennae; z, peduncular or ovarian tubules; m, ovigerous fraenum; d, anus. 



The mouth of JLfpa^ looks toward the posterior extremity 

 of the body, and leads into a tubular oesophagus, which 

 passes forward, and opens by a wide superior extremity into 

 the globular stomach. From this point, the alimentary canal 

 bends back upon itself, and gradually narrows into the in- 

 testine, which terminates in the anus, situated at the ex- 

 tremity of the abdomen, on the tergal side of the penis. 

 Two considerable branched caeca, probably hepatic, proceed 

 as diverticula from the stomach, corresponding very closely 



