Cal ice# with very slightly or only moderately elevated margins, 
diameter measured between thecal summit.®, from 3.35 to 4 m®,| rather 
shall 6w| distance apart, from a thin dividing edge to 2.5 ®a.| about 
1,5 mm. is probably the average. Thin costae moderately prominent , 
sub equal y or alternating in sis® » correspond to all septa* those from 
one ealiee extend across the 1st ereerallite spaces m.d m® t thee® fro© 
the adjacent calicee. 
Septa thin* 24 to 20 ia ^number, one-half of them extend from the 
wall to the columella, and have decidedly, sxseri margins* the other 
half are not so fall and are short, their Inner ends free, 
Indetheea end exotheea as in the typical specimens, except they 
ar# more delicata. 
fM epeeia$e«e differ fro® typical one by their much lighter texture)* 
which of course is deteralned by their thinner skeletal structures, the 
wide, flaring, free edge# of the base, and the larger calicos. The 
calices overlap in sic® those of variation Mo, 2, otherwise I should con- 
sider the specimen# a® representing n distinct species. 
Variation lie, §-. Orb jo el la hiapidula Terrill, Trans, 0|na, Acad, 
Sol,* voi, II, p. 100* PI, X¥, figs. 3, 3a, 3b. The following: is the 
original deecrlptlont 
