194 TRANS. OF THE ACAD. OF SCIENCE. 
notis speluncaria. Our specimens present the varieties men- 
tioned by M. Verneuil as occurring in Russia. 
ALLORISMA LANCEOLATA, Stwzallow. 
Shell elongate, praetaere with a well-defined, rounded 
aks marked 
ridge from the be o the ventral posterior angle, 
with large, rope, prominent eonétinteis costa, strongly re- 
ed toward the al margin; it is also ornamented 
with nodular, sence and radia ating striz; the radiatin 
strie most obvious on the posterior extremity ; beaks sm: 
Ce inted, recurved forward to, or beyond, the anterior margin; 
yen ovate, depressed. 
oth, 1.30; width, 0.67; thickness, 0.42. 
a Leng 
. Major Hawn’s collection from Permian Rocks in the vl 
of the se tjpac arth Bas a 
Atronrsaca 4) cuRTA, ‘Sutton. 
rt, ‘transverse, sub-rectangular, ‘negate gb s 
at the anterior extremity and narrower at the pos- 
“Gare. marked with large, rounded, concentric ¢ ste and 
all striz, pe ata to the cost, and m o promi- 
depressing ideo them ; beaks large, epr ssed, 
ximate, erior margin rounded ; Tenale 
‘dope, ex Sette’ dona ~ anterior slope; car -dinak 
magne Roget tng do ee 
0.97; width at ‘tela 061; thickness, _ 
scies resembles the lata 3 but it is m ee bous, 
not 
: nent in the 
sataternl,. inn moidal 3 11 
from the te towards th 
