Columella rather well developed* 
Locality ? The Silex bad, Tampa, Fla* g 
geologic her I goa t tipper dig scene. 
Type ? Wagner free Institute of Selene©* Philadelphia, 
Remarks t This specimen seems to intergrad© ■with the variety Just 
described, and in represented in the He cent fauna by that portion of 
the Buerdoa Jamaican specimen figured on PI* , fig* * Th® 
septa of the Recent specimen, however, alternate in size, while those 
of the fossil are in three sizes* This difference, although it is of 
importance, is not absolutely constant* 
Orb 1 cel la cavernosa v&r. bajtnbridgan-alg var . no-y* 
p Flats , Fig* * 
This variety is in superficial appearance similar to the Recent 
specimens with low calicos, and low equal costas? it differs by hav- 
ing the septa usually in three instead of two sites* 
Locality ? Flint Rivor, 4| miles below Baimbridga, Ga* 
GeolsMic horizon ? Upper Oligoccne. 
Type ? United States Rational Museum* 
