553 



MONOGRAPH OF THE FAMILY 

 BULLIDtE. 



By ARTHUR ADAMS, R.N., F.L.S. 



[Note. The following generic divisions of the BuUidce, by 

 Arthur Adams^ Esq., as founded upon a careful examination of 

 the animals and shells, are here given, although not in accordance 

 with the general plan of our work, because researches so useful 

 ought not to be lost for want of a vehicle for their publication. 

 At the same time, it will be observed that in enumerating the 

 species of shells, the usual form is adopted, and the proposed 

 genera only mentioned as subgenera. Collectors will thus have 

 the opportunity of choosing their own mode of arrangement.] 



Earn. BULLH)^. 



Head with tentacular lobes, often forming by their union a 

 flattened cephalic disc. Gills on the right side of the back, covered 

 by the mantle or by a shell. Foot more or less dilated at the 

 sides into swimming lobes. 



Shell none, internal, or external. Operculum none. 



Genus 1. Bullina, Ferussac. Bullinula, Beck. {Bulla, 

 sp. 1-3. pi. cxx. f. 1-3.) 



Animal ignotum. 



Testa solida, ovata, umbihcata, transverse sulcata. Spira ele- 

 vata. Labrum intus sulcatum. Labium sinuosum, antice sub- 

 truncatum. 



Animal unknown. 



Shell solid, ovate, umbilicated, transversely grooved. Spire 

 elevated. Outer lip internally grooved. Inner lip sinuous, ante- 

 riorly subtmncated. 



