270 LACUNA. 



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

 cavated umbilicus, and in possessing an epidermis?. 



Unfigured Species of Clthna. 



L. riCTA, Watson. Lat. 9°, 5', S. ; long. 84°, 40', W. 



L. INFLATA, and L. glabei-la, Monts. Mediterranean. 



lu. spiRATA, and L. globosa, Adams. Japan. 



Doubtful and Unfigured Species of Lacuna. 



L. decorata, L. latifasciata, L. lepidula, L. turrita, and 

 L. INFLATA, A. Ad. Japan. 



L. carinifera, a. Ad. Borneo. 



L. unicarinata, E. A. Smith. Japan. 



Li. (Ersilia) Mediterranea, Monts. Mediterranean. 



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



L. VESTITA, Dunker and Metzgar. North Sea. 



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



Whorls angulated by spiral carin?e, of which there are three on 



the body whorl, fading towards the aperture; umbilicus narrowly 



rimate. Length, 1 mill. 



Isl. St. Paul, Indian Ocean. 



L. Heberti, Velain. PI. 51, fig. 79. 



Smooth, with three convex, rapidly increasing whorls, yellowish 

 or brownish grey, umbilicus scarcely rimate. Length, l"7o mill, 



Isl. St. Paul, Indian Ocean. 



This and the preceding species are of doubtful pertinence to the 

 present group. 



