210 TRANS. OF THE ACAD. OF SCIENCE. © 
differs from E. rudis, McCoy, (Brit. Pa. Fos, pl. 3, fig. 9,) 
in having the anterior and posterior slopes plicated, and not 
rapid smoo 
e pleasure in dedicating this shell to Maj. Hawn, the 
indefatigs le discoverer of the Permian System in 
detunon 
ALLORISMA CUNEATA, Swallow. 
ongate, cuneate, thick and narrow at the anterior 
salty. broad and thin at the posterior; obliquely gibbous 
from the lager to the posterior extremity, ornamented wi 
concentric ribs and stri,;which form a sharp curve near 
/ ey Saicembby of the shell; ventral margin defined by a 
pocae anterior half of cardinal margin straight, the remain- 
der a towards the ventral; posterior extremity suban- 
rominent, pointed, approximate, and terminal. 
“th 173 fr greatoss ae adth, 0.89; thickness, 0.61. _ 
shell diters from all other specimens of the genus by 
3 cuneate form, and ve very pointed termin rminal beaks. 
Missov ee State collection from Middle Coal Messicea ne 
- Atonisaa LAT hy a he 
‘si longate subovate, ‘narrowed and fattened ‘oval 
unded, 
