Professor MacGillivray on the Cirripedia. 171 



Remarks on (he Cirripedia, with Descriptions of several Species 

 found adhering to Vessels from Ichaboe, on the JVest Coast 

 of Southern Africa. By WiLLiAJi MacGillivray, A.M., 

 LL.D., Professor of Natural History in Marischal College 

 and University, Aberdeen. (Communicated by the Author.) 



Continued from p. 305 of vol. xxxvlii. 



CiNEKAs. Soft Barnacle, 



Animal oblong, somewhat compressed, gibboso-convex on the back, 

 inciirvate, with the mouth very prominent, and furnished with a pair of 

 external, partially adnate pointed palpi, and three pairs of incurvate, 

 compressed, maxillary appendages, of which the thin terminal lamina is 

 ciliated with spines or bristles ; the body narrowed behind, with twelve 

 pairs of pedicellate, long, tapering, incurvate, multiarticulate, lobulate, 

 ciliate cirri ; two branchial filaments at the base of the first foot, and a 

 very short one on several of the rest, on each side. 



Tegmen compressed, ovato-quadraugular, coriaceous, vfith five dis- 

 tant, very slender, calcareous pieces ; two of them elongated, with an 

 oblique submedial process, along the ventral margin ; two linear, at the 

 summit ; and a long curved dorsal piece meeting the upper two behind ; 

 peduncle subcylindrical, fleshy, its epidermic coat continuous with the 

 tegmen ; its inner dermic coat continuous with the dermal lining of the 

 tegmen, on the inner surface of which is a layer of pigment arranged in 

 spots or bands. 



This genus, instituted by Dr Leach, is composed of Barnacles of 

 which the membranous tegmen resembles a flattened purse or bag, to 

 which a somewhat square form is given by its five marginal pieces, re- 

 duced to slender spiculse. It is closely allied to Lepas, although exter- 

 nally so different, and still more so to Otion, 



A Cineras, in fact, is a Lepas of which the calcareous plates are re- 

 duced so as to leave the greater part of the envelope membranous ; and 

 an Otion is a Cineras of which the calcareous pieces are abbreviated, the 

 dorsal piece reduced to the minimum size, and with two membranous 

 bags appended to the upper part behind. The animal in all is essentially 

 the same ; yet Dr Leach, who in his arrangement emplo3's verj"^ super- 

 ficial characters, refers Cineras and Lepas to two different families. It 

 would certiiinly be more reasonable to make them sections of one genus. 



These animals are found adhering, in great profusion, to tho 

 planks of vessels that have been on long voyages, as well as to float- 

 ing wood, turtles, fishes, and other objects. They ai-e generally 

 associated with species of the genera Otion and Lepas. 



1. Cineras membranacea. Banded Soft Barnacle. 



Tegmen ovato-quadrangular, somewhat compressed, gradually taper- 

 ing into the peduncle ; light greyish-blue, with three longitudinal dusky 

 bands on each side, or brownish-grey irregularly dotted or streaked with 

 dusky. 



The body of the animaJ is subovate, somewhat compressed, incurvate, 



