109 



eloagated lamellar plates, which cover the sutures of the posterior 

 junction of the valves. 



Type and Class ANNULOSA CIRllIPEDES. 

 Family BALANIDEA. 



OoNOPEA. — Shell sessile, fixed, composed of two coacs joined 

 by their bases, the lines of junction earinate each side; inferior 

 cone entire, attached by its anterior side and tip to marine bodies ; 

 superior cone formed of six united pieces, with an aperture at the 

 summit, closed by a quadrivalved operculum. 



CoNOPEA ELONGATA. — Shell elongated before and behind into 

 compressed processes ; posterior valves of the operculum more 

 prominent and truncated at tip. 



Inhabits the southern coasts on Gorgonia vh-gulata, Lam. 

 Cabinet of the Academy and Philadelphia Museum. 



Anterior and posterior processes very much compressed, acutely 

 edged above and beneath, and usually as long as the body of the 

 shell; shell generally covered with a dirty brown epidermis, be- 

 neath which it is white, with rufous clouds and lines ; posterior 

 valves of the operculum larger, more prominent, truncated or 

 widely emargimate at tip. 



Balanus galcatus, an inhabitant of the Asiatic ocean, a species 

 long known, and described by various authors, is congeneric with 

 the species here described. The peculiar characters of these 

 shells, their general appearance and their habitat will not admit 

 of their being refeiTed to the genus Balanus in a perfectly natural 

 arrangement. I have therefore thought it necessary to frame the 

 present genus for their reception. 



The anterior process of the elongata is generally acuminated and 

 longer than the posterior one, which is more compressed, and is 

 generally more or less elevated from the branch of the Gorgonia, 

 upon which the anterior process and the basal cone are firmly at- 

 tached. 



Bruguiere informs us that the galea is obtained from great 

 depths in the ocean only ; but I have found the elongata in con- 

 siderable numbers in inlets of the bay of Charleston, on Gorgonia, 

 which at the recess of the tide was visible on the surface of the 

 water. 



