66 CONCHIFERA. 



open "below ; siphonal orifices one or two ; foot 

 lengthened, cylindrical or strap-shaped, protruded 

 at the base of the shell. 



Galeomma (Turton). Shell thin, oval, equal- 

 sided, gaping widely below, covered with a thick 

 fibrous epidermis; ligament internal; teeth . 

 Animal with one siphonal orifice. 



G. Turtoni. Fig. 99; n.s. 



Lepton (Turton). Shell roundish, flattened; 

 hinge-teeth or 1, in front of an angular cartilage 

 notch ; laterals f , }. Animal with one siphon ; 

 mantle edges fringed; foot thick, heeled and 

 grooved, forming a creeping disk. 



L. Clarkise. 

 convexum. 

 nitidum. 

 squamosum. Fig. 100 ; n. s. 



102 



o 



101 103 



Montacuta (Turton). Shell minute, oblong, 

 hinge-line notched ; ligament internal, between 

 two diverging teeth. Animal with the mantle- 

 edges simple', open in front. 



M. bidentata. 

 ferruginosa. 

 substriata. Fig. 101 ; mag. 



Kellia (Turton). Shell small, roundish; beaks 



