Leach. Siipp. to Ediii. Encyclop. 



TESTA conica, valvis quatuor cpqualibiis, latera- 

 liter ferruminatis, composita; apice pervio^ 

 basi valva testacea, affixa clausa. Operculum 

 bipartitum, valvis quatuor compositum ; pari 

 postico prominulo. 



The Balaniis porosus, and the B. purpurascens of aiitliors 

 are easily distinguished from all other sessile Cirripedes, 

 not only by the numerons pores which are observable in the 

 substance of their shell, but by the cone itself consisting 

 of only four valves, whereas Balanus, Acasta, Tubicinelia, 

 Coronula, &c. consist of six valves or pieces joined 

 together by their sides : we therefore highly approve of 

 Leach's having separated them from the other Balani, 

 under the generic name Conia, and we should have been 

 surprized at Lamarck's not adopting it, if we had not 

 observed that he has paid no attention to the number of 

 valves of which the cone is composed, except in two 

 instances, in the characters of B. pustularis, where he 

 says, radiis sex;'' and B. crisp atus, where he incorrectly 

 says, " radiis qiiinqueJ' 



Shell more or less regularly conical, consisting of 

 four rather triangular, nearly equal valves, joined toge- 

 ther by their sides, open at its summit and closed at its 

 base by a testaceous attached valve, which takes the form 

 of whatever substance it adheres to ; and consequently, 

 in_ a great measure influences the general form of the 

 whole, for it is observable that when this is attached to 

 a smooth and even surface, the whole shell is regular in 

 %its growth and shows distinctly the four radii; on th-e 



