OCT ERE ene eae 
are’ : 7 ey i P h 
* 
70 
4 
rowness of the middle abdominal lobe, clearly distin- 
guish it from either of Dr. Dekay’s species. 
: | ra ee 
Isoretus Mreators.* Green. Cast. No. 25. 
wv 
Clypeo antice sibel o lates! postice arcuatos oculis — 
magnis, rotundis, eminentissimis; cauda suborbicu- 3 
lari, limbo lato; articulis abdominis octo. . , 
The buckler in its contour -adsinblea very much 
the head of the I. gigas; it is, however, rather more 
rounded before, and arcuated behind. The oculi- 
ferous tubercles, are very peculiar, being very large, ) 
round, and exceedingly prominent. They have a 
good deal the appearance of solid | hemispheres 
placed on the forehead of the animal. They are ex- 
actly on a line with the two abdominal furrows. The 
abdomen is composed of eight distinct articulations; 
the middle lobe is rather larger than the’ lateral — 
lobes. The tail is suborbicular, convex, and rather — 
less than the head. Length nearly me inches. i 
Breadth almost three inches. | + Yds ia ae 
_ This magnificent Isotelus was shihiahéd near Tent 
ton falls, in New York, by P. A. Browne, Esq), and 
now forms a part of his fine collection of fossils, in — 
this city. It occurs in black transition limestone. — 
It differs essentially from the I. gigas: of D Dekay, in 
the magnitude, collocation, and contour of the eyes. — 
Those of the I. gigas are oblong and | india | 
meee half the distance between » (hela aaa 
