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, J3, I). 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 Lepas^ and that a Barnacle may be said to be a Crus- 



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



j with its legs. 



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

 of the sac, and lies over the labrum ; 6, prosoma ; c, carina; c, I, carino-lateral 

 compartment; I, lateral compartment: r, rostrum; «, scntnra; t. tergam; /, penie; 

 p. trnt-formed gland ; h. duct connecting this with i. k, cement-duct and glands; 

 /', antennae; i, peduncular or ovarian tubules; m, ovigerous fra&nam; </, anus. 



The mouth of JLppas 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 cseca, probably hepatic, proceed 

 as diverticula from the stomach, corresponding very closely 



