138 RAPANIN^.. 



in that genus. It comprises but few species, which take 

 up their abode in corals and madrepoi-es 



Species of Leptoconchus. 

 oblongus, Sow. Peronii, Lam. 



Sub-gen. ooralltobia, H. and A. Adams. 



Shell with the spire obsolete, sublateral, last whorl large, 

 lamellose ; a^^erture very wide, simple anteriorly; outer lip 

 expanded, fimbriated. 



fimbriatus, A. Adams. 



Genus CAMPULOTUS, Guettard. 



Man tie -margin thickened, siphon very short. Foot 

 large, fleshy, oval. 



Operculum ovate, nucleus sublateral. 



Shell, when young, spiral, thin ; when adult, white, solid, 

 tubular, spiral for three or lour whorls, the last turn pro- 

 longed into an irregular, straight or flexuous tube, solid 

 posteriorly, and with a siphonal keel on the left side. 



Sy7i. Magilus, Monif. Tubulites, Davilla. Spiro- 

 b r an ch u s , Bla in v . 



E.v. C. antiquus, Monif ort, pi. 14, fig. 10. Opercu- 

 lum, C. antiquus, fig. 10, a, 10, b. Shell, C antiquus, 

 fig. 10, c. 



This curious genus lives in coral, and the inordinate 

 extension of the lips of the shell is to enable the animal 

 to keep on a level with the surface of the coral as it 

 continues to increase in size ; as the shell grows, the tube 

 behind is filled up with solid calcareous matter. 



