358 



CIRRHOPODA. 



the generative apparatus. It must therefore be our endeavour, 

 in considering this part of their economy, to separate as far as 

 practicable all conjecture and hypothetical reasoning from the 

 simple facts which anatomy has placed at our disposal, and leave 

 disputed questions to be solved by careful experiment and re- 

 search. According to the dissection of John Hunter, the internal 

 generative apparatus is double, occupying both sides of the ali- 

 mentary canal. Covering the liver (Jig. 169, d), there is found 

 a vascular substance, which Fig. 169. 



the above-named illustri- 

 ous anatomist regarded as 

 probably constituting the 

 tubular parts of the testi- 

 cle, from which a tortuous 

 canal with very thick walls 

 (vas deferens) runs up- 

 wards, along the side of 

 the intestine to the root 

 of the fleshy prolongation 

 A:, at which point it is 

 joined by the correspond- 

 ing tube from the oppo- 

 site side of the body. 

 The common canal thus 

 formed is extremely slen- 

 der, and passes in a flexu- 

 ous manner through the 

 whole length of the tubu- 

 lar organ (&), named by 

 Hunter, apparently for the sake of brevity, the penis, to terminate 

 by a minute orifice at its extremity. Yet, notwithstanding the 

 name applied to the termination of the sexual canals, Hunter was 

 well convinced that the Cirripeds were hermaphrodites ; as he ex- 

 pressly says,* " It is most probable that all Barnacles are of both 

 sexes and self-impregnators ; for I could never find two kinds of 

 parts, so as to be able to say, or even suppose, the one was a 

 female, the other male." 



Cuvier found the vascular mass, considered by Hunter as being 

 the tubular portion of the testis, to be composed of granules which 



* Descriptive and illustrated Catalogue of the Physical Series of Comp. Anat. in 

 the Mus. of the Royal Coll. of Surgeons in London, vol. i. p. 259. 



