C. D. Walcott—Paleontologic Notes. 115. 
genus Obolella; O.? polita Hall, O. ambigua Walcott, as repre- 
senting the second group, and 0. sagittalis the third. In study- 
ing O. transversa Hartt, the similarity between it and O. sag- 
itahs was noted. For this type the following genus is proposed 
in honor of the late Dr. G. Linnarsgon. 
Famity OBOLID. 
LINNARSSONIA, n. gen. 
Shell caleareous, transversely or longitudinally ovate, sub- 
Circular; convex in the typical species; valves inarticulate. 
outward on each side, so as to enclose a projecting A 
oc ridge that is highest at its posterior margin, just in 
font of the circular foraminal opening. 
separated by a low, flat ridge that extends forward between the 
‘wo small divaricator scars. Type, Oboleila transversa Hartt. 
Mr. Davidson did not find that the ventral valve of Obolella 
th was perforated, but if finely preserved specimens of 
rap exterior of the valve can be obtained, I have little doubt 
| sik the apex will be found to be perforated by a minute 
n. 
Tn an almost identical form Mr. Linnarsson* found the ventral 
Valve to be perforated, and also describes a pedicle groove that, 
&8 Yet, we fail to find in LZ. transversa. 
he Obolella-like form figured by Barrande and De Verneuilt 
bel the ventral valve perforate, and appears to be closely 
hg to the genus under consideration. 
be plan of the interior of the ventral and dorsal valves of 
and chromatica are given as in Mr. S. W. Ford's paper,t 
; the interiors of LZ. transversa from drawings from the types 
, ed species, 
. *0 a future r I will endeavor to bring together descrip- 
Onna illostrations of all the American Coealeind species of 
; Brach. Paradoxides beds of Sweden, 187 6, pl. iii, figs. 36-41. 
i Geol. Soc. France, 2d ser., vol. xvii, pl. viii, fig. 5. 
The genus Obolella. This Journal, vol. xxi, p. 131, 1881. 
