380 Miscellanies. 
found in this vicinity this spring, have discovered that it cannot be 
confounded with it. Among those who thus doubted at first, and after- 
wards became convinced, I may mention Dr. J. A. Warder of this 
place, who, on a recent visit to Springfield, Ohio, found among some 
fossils belonging to his sister, a specimen of what he deems another 
species belonging to the same genus with the present. On consulta- 
tion, we have concluded to form a new genus, to be called Cerato- 
cephala, (horned head.) 
(3.) AsaApHUS PoLYPLEURUs. Green.* 
aire! ? costis abdominis duplicibus; cauda rotunda; corpore 
CONDEL 
This asks at first sight, seems to differ especially from all the 
other American species hitherto noticed, in the number and thinness 
of the ribs, or costal arches of the abdominal lobes. When carefully 
examined, however, it becomes obvious that the apparent number of 
the ribs is produced by a straight longitudinal furrow on the upper 
surface, which divides each rib into two nearly equal portions, thus 
seemingly doubling their number. These furrows or grooves do not 
terminate in the costal arches, but extend, in several instances at least, 
beyond, into the membranaceous expansion by which they are sur- 
rounded. The ribs therefore do not end in free angular points, as 
ee of the A. Wetherilli, the A. Limulurus, and some others. The 
aceous expansion forms a narrow semicircular border round 
& lateral and caudal edges of the body. The middle lobe of the 
back is very prominent, The animal is decapitated, and the fragment 
described measures in length and breadth three fourths of an inch. 
The above trilobite occurs in a coarse grained greyish limestone, 
which contains other fossils. It was found by that distinguished geol- 
ogist, Richard C. Taylor, Esq., in the state of Missouri, on the bank 
of the Mississippi, near the mouth of the Des Moins river. It is to be 
regretted that our fossil is so much mutilated and worn; but enough 
yet remains to identify from it the species, when perfect specimens 
shall be discovered. The prominence of the middle lobe of the abdo- 
men indicates that it may ultimately be referred to some other genus 
than the Asaph. 
(4.) Additional notices of Trilobites. 
From Mr. J. Walter, of Louisville, Ky., we have received a draw- 
ing of a trilobite seven and a quarter inches long, by four inches broad. 
te Se 
“e Communicated for this Journal, by Jacon Grex, M.D. Professor of Chemis- 
try in the Jefferson Medical College, Philadelphia. 
