CTRRIPEDES. 81 



and to impregnate the ova in their passage through it ! 

 having preserved the same appearance as it mounts along 

 the side of the body, it again, at the height of the anus, as 

 suddenly becomes a simple canal or tube, unites with its 

 fellow from the opposite side in the ovipositor or that long 

 proboscidiform organ in which the tail part or highest end 

 of the animal ends, at the extremity of which they open 

 together by a simple orifice. 



Those who may wish for further particulars of the ana- 

 tomical structure of the Cirripedes are referred to the 

 unrivalled work of Poli " Testacea utriusque Sicilies ", to a 

 memoir by Cuvier " Sur les animaux des Anatifes et des 

 Balanes" and to the Lectures on Comparative Anatomy of 

 Sir Everard Home. 



Towards the completion of the Natural History of this 

 tribe of animals, it remains to be known whether the Larvae 

 of all the Genera are similar or dissimilar, and whether, in 

 any of them, males exist at any stage of their progress. 

 Industry and the acuteness of the present generation may 

 be expected to bring about the solution of these interesting 

 questions in the course of a very few seasons, Viow that the 

 road has been so fully pointed out. 



In the thirteenth Lecture of Sir Everard Home on the 

 comparative anatomy of Animals, Vol. Ill p. 410, that gen- 

 tleman exposes the economy of the Lepas anatifcra in 

 regard to its propagation, and which might incline some 

 Naturalists, sensible of the authority due to so celebrated a 

 veteran in the paths of science, either to doubt the wonder- 

 ful facts now brought forward, or to imagine that the mode 

 of propagation may be very diiferent in the Lepades. Sir 

 Everard finding the fleshy tubular pedicle replete with ova 

 after their exclusion from the Ovaria in the specimens 

 which he examined, supposes they remain there to receive 

 their ultimate developement, but has probably been decei- 

 ved in imagining the embryos to make their way out through 

 the paricties of the pedicle, by which he accounts for their 



