Some neiv Fossils from Eastern Massachusetts. — Hobbs. 1 1 5 
OBOLELLA GAMAGEI. 
line in the illustration, hence the dotting in this case does not indicate 
conjecture. 
Ventral valve (?). Probably represented by detached and much 
distorted specimens on the same slabs, there being the four impres- 
sions of the single shell, two containing original organic shell-sub- 
stance. This valve scarcely aflfords any additional facts, except, per- 
haps, that it was the larger of the two valves. 
Dimensions. Dorsal, 6.4 mm. on the longitudinal axis by 7.4 mm. 
on the transverse axis. Ventral not accurately measurable. 
Formation and Locality. Paradoxides zone. Middle Cambrian, 
East Braintree, Mass. The specimen was obtained from a ledge be- 
low high tide level, 75 or 100 feet east of the well known quarry at 
this locality, in a compact greenish grey, silicious, slate or argillyte, 
more thinly parting than the quarry rock and unusually full of trilo- 
bites. 
So far as 1 have been able to find, this is the third species 
of Obolella described from the American Middle Cambrian; 
the others being 0. nana Meek & Hayden, and 0. polita 
Hall. The specimen is pitted on the surface as if from the de- 
predations of some Cliona-like animal. 
The specific name is given in honor of a friend. Miss A, 
( ). damage. South Bristol, Maine, in recognition of her serv- 
ices to the writer. T3^pe specimen is to be presented to the 
IJoston Society of Xatural History for exhibition. 
