414 * 
PALEONTOLOGY OF NEW-YORK. 
The specimen consists of an imperfect carapace, with a part of the first joint of 
the thorax remaining on one side, which is pustulose in the same manner as the 
carapace. There are some intervals on the surface of the carapace, between and 
behind the eyes, where the pustules assume a somewhat scale-like form, similar to 
the rows of scale-like pustules down the back of the animal. 
Fig. 1. The specimen, natural size. 
Geological position and locality. In the Waterlime group, near Buffalo. 
Eurypterus, Subgenns Bolichopterus. 
Cephalic, thoracic, and caudal portions of the body similar to Eurypterus. 
Postoral plate lyrate or cordiform-lyrate; the central thoracic appen¬ 
dage, from the first thoracic segment, strong, thick and simple in its 
anterior part; extremity? Anterior feet composed of strong thick 
joints, with curved terminal spines : posterior or natatory organs 
having the joints elongate, the seventh and eighth little dilated, and 
the terminal palette extremely developed. 
' * 
The principal differences from Eurypterus are in the development of the palette, 
the less dilatation of the natatory feet, the form of the postoral plate, and the cen¬ 
tral foot-like organ. 
©oliclioptenis nmcroclieiras (n. s.). 
Plate LXXXIII. Fig. 1 ; and Plate LXXXIII A. Fig. 1. 
Carapace semioval, somewhat straight in front; sides straight for more 
than half the length from the base; length and breadth about as 9 to 
10. Eyes large, oval, distant, placed far forward and nearer the anterior 
than the lateral margins of the carapace. Body elongate ovato-lanceo- 
late, gradually contracting to the base of the first five joints, and more 
abruptly below the sixth. The joints of the thorax are strong, and six 
or seven times as wide as long; the ninth, tenth and eleventh segments 
are proportionally much longer, the last one quadrangular. The margins 
of the abdominal joints are but slightly imbricated. The anterior feet 
