360 CIRRHOPODA. 



amorphous, and inseparable from the pulpy substance in which they 

 are imbedded ; but, as they approach to maturity, they become 

 of an oval shape, pointed at both ends, and are easily detached. 

 Sir Everard Home has given a very good representation of them 

 at this stage of their progress, in his Lectures on Comparative 

 Anatomy, from the elegant pencil of Mr. Bauer." 



" During the stay of the ova in the pedicle, they render this 

 part more opaque and of a bluish tint ; the ova themselves, and 

 the cellular texture in which they are surrounded, being of a pale or 

 azure blue colour. It is difficult to conceive in what manner the 

 ova are extricated from the situation above indicated ; but it is 

 certainly not by the means suggested by Sir E. Home in the 

 above-mentioned lecture, viz. by piercing outwards through the 

 membranes of the pedicle, for the ova are subsequently found 

 forming a pair of leaf-like expansions, placed between either side 

 of the body of the animal and the lining membrane of the shells. 

 These leaves have each a separate attachment at the sides of the 

 animal to the septum which divides the cavity occupied by the 

 animal from that of the pedicle : they are at first comparatively 

 small, have a rounded outline, and possess the same bluish colour 

 which the ova had in the pedicle ; but, as the ova advance in 

 progress, these leaves extend in every dimension, and lap over 

 each other on the back, passing through various lighter shades of 

 colour into pale pink, and finally, when ready to hatch, become 

 nearly white. These leaves appear to be composed of a layer 

 of ova, irregularly placed and imbedded in a kind of parenchy- 

 matous texture, out of which they readily fall, when about to hatch, 

 on its substance being torn asunder ; indeed, it appears at length 

 to become so tender as to fall entirely away, so that, after the 

 period of gestation is passed, no vestige of these leafy conceptacles 

 is to be found." 



(3.96.) In the second form of CIRRHOPODA (Balani), the 

 animals, instead of being appended to foreign substances by elastic 

 and flexible pedicles, are sessile ; the shelly investment of the body 

 being in immediate contact with the rock, or other submarine 

 body, to which the Barnacle adheres. The soft tube of Penta- 

 lasmis is, in this case, represented by a strong testaceous cone 

 composed of various pieces accurately joined together, and generally 

 closed inferiorly by a calcareous plate ; while the representatives of 

 the valves of the pedunculated species form a singular opercu- 

 lum, which is moved by special muscles, and accurately shuts the 



