270 LACUNA. 



Probably not a member of the group, differing in having no ex- 

 cavated umbilicus, and in possessing an epidermis?. 



Unfigured Species of Cithna. 



L. PICTA, Watson. Lot. 9, 5', S. ; long. 34, 40', W. 



L. INFLATA, and L. GLABELLA, Monts. Mediterranean. 



L. SPIRATA, and L. GLOBOSA, Adams. Japan. 



Doubtful and Unfigured Species of Lacuna. 



L. DECORATA, L. LATIFASCIATA, L. LEPIDULA, L. TUBRITA, aild 



L. INFLATA, A. Ad. Japan. 



L. CARINIFERA, A. Ad. Borneo. 



L. UNICARINATA, E. A. Smith. Japan. 



L. (ERSILIA) MEDITERRANKA, Monts. Mediterranean. 



L. SUCCINEA, Morch. West Coast of Central America. 



L. VESTITA, Dunker and Mot/gar. North Sea. 



L. PARVULA, Velain. PI. 51, fig. 78. 



Whorls angulated by spiral carinse, of which there are three on 

 the body whorl, fading towards the aperture ; umbilicus narrowly 

 riiuate. Length, 1 mill. 



./s/. *S'/. Paul, Indian Ocean. 



L. HEBERTI, Velain. PL 51, fig. 7H. 



Smooth, with three convex, rapidly increasing whorls, yellowish 

 or brownish grey, umbilicus scarcely rimate. Length, 1*75 mill. 



Isl. St. Paul, Indian Ocean. 



This and the preceding species are of doubtful pertinence to the 

 present group. 



