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eloagafced lamellar plates^ whicli cover the sutures of the posterior 
junction of the valves. 
Type and Class ANNULOSA CmiilPEDES. 
Fmnilij BALANIDEA. 
OO'NOPEA. — Shell sessile, fixed, composed of two cones joined 
by their bases, the lines of junction carinate 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 virgulata, 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 
xsheil; 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 galeatus, an inhabitant of the Asiatic ocean, a species 
long known, and described by various authors, is congeneric with 
tlie species here described. The peculiar characters of these 
shells, their general appearance and their habitat will not admit 
of their being referred 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 
<lepths 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. 
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