0. oellulosa 
43 a 
older form, and is clearly a variety; for here and there, amongst 
the numerous individuals of the masses from the Inclined Strata, 
the septa of the third order are now and then seen to curve 
towards those of the second* ” 
Re marks : The type of the species was examined in the Geological 
Society of London. The most nearly related species is Orb icella tenuis 
from which it differs by having the primary and some secondary septa thick- 
er and longer than higher cycles. _0. cellulosa is one of the widely dis- 
tributed Oligocene species occurring outside of Antigua, Tampa, Fla., and 
near Bainbridge , Ga. The specimens from the continent, however, appear 
to have certain characters different from those from Antigua sufficient- 
ly constant to warrant giving them a varietal name. A specimen from 
Bejucal, Cuba, collected by Dr. Arthur C. Spencer, may be referable to 
this species; because of the recrystallization of the original calcareous 
matter of the skeleton, and other changes due to f ossilization , it can 
not be positively identified. The calices are between 3 and 4 mm. in 
diameter. The six primary septa are constantly larger than the others. 
In one calice there seemed to be indications of quaternaries; the doubt 
in the identification of the specimens is due to inability to be sure of 
the presence or absence of quaternaries. 
