OENEEATIVE SYSTEM OF PENTELASMIS. 



455 



Fig. 235. 



placed at our disposal, and leave disputed questions to be solved by 

 careful experiment and research. According to the dissection of John 

 Hunter, the internal generative apparatus is double, occupying both 

 sides of the alimentary canal. Covering the stomach (fig. 235, d), there 

 is found a vascular substance, 

 which the above-named il- 

 lustrious anatomist regarded 

 as probably constituting the 

 tubular parts of the testicle, 

 from which a tortuous canal 

 with very thick walls (yas 

 deferens) runs upwards along 

 the side of the intestine to 

 the root of the fleshy pro- 

 longation (&), at which point 

 it is joined by the correspond- 

 ing tube from the opposite 

 side of the body. The com- 

 mon canal thus formed is 

 extremely slender, and passes 

 in a flexuous manner through 

 the whole length of the tu- 

 bular organ (fc), named by 

 Hunter, apparently for the 

 sake of brevity, the penis, to 

 terminate by a minute orifice 

 at its extremity. Yet, not- 

 withstanding the name ap- 

 plied to the termination of 

 the sexual canals, Hunter 

 was well convinced that the 

 Cirripeds were hermaphrodites, as he expressly 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." 



(1175.) Cuvier found the vascular mass, considered by Hunter as 

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

 which he deemed to be ova ; and conceived the delicate white vessel 

 seen to ramify through the ovarian mass, as represented in the figure, 

 to be the oviduct, whereby the eggs were taken up and conveyed into the 

 thick and glandular canal (h), from the walls of which he imagined that 

 a fecundating liquor might be secreted for the impregnation of the ova 

 in transitu. He therefore regarded the proboscidiform tube (&) as an 



* Descriptive and Illustrated Catalogue of the Physical Series of Comparative 

 Anatomy in the Museum of the Eoyal College of Surgeons of England, vol. i. p. 259. 



Anatomy of Pentelasmis vitrea: a, external en- 

 velope of the body ; 6, the mouth ; c, the oesophagus ; 

 d, the stomach ; e,f, tract of the intestine ; g, bristle 

 inserted into the anal orifice ; h, the oviduct. (After 

 Hunter.) 



