186 . MEGATEBENNUS. 



M. complanata Sowerby Jr. PL 62, fig. 13. 



Shell oblong, depressed, white, ends a little elevated, with impressed 

 radiating lines and concentrically most minutely striated ; inside 

 with thickened crenulated margin, circumscribed by a wide callus ; 

 foramen large, oval, central. A thick shell, with ends slightly 

 elevated and very large fissure. (Sowb.) 



East coast of Africa* 



F. complanata Sowb. Thes. Conch, iii, p. 203, f. 201. 

 M. florescens Sowerby Jr. PL 62, figs. 14, 15. 



Shell oblong, thin, narrowed in front, subdepressed, the ends a 

 little elevated, concentrically undulately striated, radiated with de- 

 pressed, unequal riblets ; reddish-brown, variegated with red, white 

 inside. Margin crenulated, rosy, perforation-callus rose-margined ; 

 foramen large, a little below the middle. A very pretty shell in 

 Mr. Hanley's collection, in some respects resembling F. chemnitzii, 

 but much thinner and not so much pinched at the sides or elevated 

 at the ends. (Sowb.') 



Habitat unknown. 



F. florescens Sowb. Thes., p. 202, f. 202, 203. 



M. incarnata Krauss. PL 35, figs. 4, 5. 



The shell is ovate-oblong, usually of equal width in front and be- 

 hind, rarely narrower in front, thin, sometimes depressed, some- 

 times convex, rose-red, marked with dark or reddish-brown bands 

 and flecks. The radiating strise are very fine, distinct and rather 

 equal, quite so in a few specimens. The orifice is a little back of the 

 middle, oblong, of equal width (in the figured specimen measuring, 

 length 1-8, breadth '8 lines), whitish or grayish on its outer edge. 

 The edge of the shell is, in well-preserved specimens, very sharp and 

 finely crenulated, but often is worn and smooth. The shell gapes 

 strongly at both ends, and when standing on a plane, rests only up- 

 on the middle of the side-margins. Inside it is shining, white or 

 pale rose, somewhat darker at the periphery, the perforation-callus 

 edged with gray. The muscle-impression is distinct, and lies about 

 a millimeter from the margin. 



The proportion of breadth to length varies much. 



Length 7*8, breadth 4, alt. 1*8 lines. (Krauss.) 



Length 7, breadth 4, alt. 1*9 lines. 



Length 6-6, breadth 4-2, alt. 1*6 lines. 



Table and False Bays, Natal. 



F. incarnata Krauss, Die Siidaf. Moll., p. 65, t. 4, f. 7. 



