CIRKIPEDIA. 159 



we must then regard the organs of generation in the large attached 

 individuals under a different and more simple point of view than they 

 have hitherto been described. The males are, however, wholly hypo- 

 thetical : they have not, hitherto, been seen, or at least recognised, as 

 such. In the pedunculated Cirripede, a large granular, glandular 

 mass, covers the viscera immediately beneath the muscular tunic of the 

 body, extending from the mouth to the anus. Its numerous ducts 

 successively unite into three or four principal trunks, which terminate 

 in a lateral receptacle {g) at the side of the intestine. In Lepas a 

 duct is continued from this receptacle on each side, which ducts unite 

 to form a common tube (A), which passes through the canal of the ex- 

 tensile tail. In Otion the two canals are continued distinct to the ex- 

 tremity of the process. The walls of the receptacle, which is the 

 common termination of the ducts of the lateral glandular body, are 

 thick and glandular. 



According to Cuvier and Dr, Burmeister these glandular parietes 

 of the ducts of the gland constitute the testis, and the glandular 

 mass itself is the ovary. The ova are impregnated in the course of 

 their passage through the common receptacle, and the duct continued 

 from it. 



On the dioecious hypothesis, we must suppose that the large fixed 

 individuals are females ; that the ovarium exists under the form and 

 situation in which it is described by Cuvier; and that the supposed 

 testis, which makes its appearance in a very questionable form as a 

 glandular tunic of the oviduct, is actually a nidimental gland, and 

 adds an exterior covering to the essential part of the ovum. 



But ova are certainly developed in the pulpy substa,nce of the 

 peduncle. These, however, in Cuvier's view of the organs, are sup- 

 posed to be impregnated ova, conveyed by the extensile tail or ovi- 

 positor into the cellular texture of the peduncle. On the dioecious 

 hypothesis the ova of the peduncle must also be supposed to be con- 

 veyed by the ovipositor from the lateral ovaria, but to be impregnated 

 by the males hi transitu. 



Another explanation of the parts in question has been offered, on 

 the assumption that both sexes are combined in the same individual : 

 the part described by Cuvier as the ovarium is held to be the testis; 

 the dilated canal into which its ducts converge is a spermatic recep- 

 tacle ; its glandular walls a prostatic organ ; and the terminal flexible 

 and extensile tube (Jig. 86. e), the penis. The true ovarium is situated 

 in the peduncle, to the soft tissue of which the ova unquestionably ad- 

 here when first developed. It is here that they acquire the azure or 

 violet-coloured yolk ; and from this part they subsequently pass into 

 two leaf-shaped receptacles, placed one on each side, between the body 



