Cope. | 574 [Feb. 3, 
tus, a genus only known as yet from cranial remains. With present knowl- 
edge the reference of the J. ohiensis to the latter genus is inadmissable. The 
cranium, thoracic region, and fore-limbs of Ichthycanthus are unknown. 
Char. Specif. The centra of the dorsal vertebre are about as long as 
deep, and their sides are deeply concave: there are four anterior to the 
pelvis which are without ribs. The caudal vertebre are robust, and seven 
from the first, support a small tubercule-like diapophysis. The chevron 
bones are short and acuminate; the neural spines are a little shorter, nar- 
row and truncate, and directed backwards at the same angle as the chevron 
bones. They are much reduced on the eighteenth caudal vertebra, where 
the chevron bones are considerably longer. 
The abdominal rods are quite slender. The hind limb is quite stout for 
this order. The femur is regularly expanded at both extremities, but the 
distal is deeply and openly grooved, distinguishing the condyles, while the 
proximal end is plane. There is no trochanter visible.. The ulna and ra- 
dius are well separated, and are three-fifths the length of the femur. There 
is a large fibulare tarsal bone of a subquadrate outline. In immediate con- 
tact with it is the probably external digit with five phalanges or segments ; 
the ungual is simply conic. The femur is as long as five dorsal vertebre. 
The ribs have expanded, undivided heads, and extend to the abdominal 
armature. 
Measurements. M. 
Length of last ten dorsal vertebrae. ............2.0-. 00 -047 
a «< first twenty-three caudal vertebre........... 117 
ue “@ posterior Tibises+s <i exeveseeecssesennvene .029 
fe By os dorsal vertebra...........-....6 005 
as ‘twenty-second caudal vertebra.............. 005 
ee OP OMVMOT & siesse cases noose wiciaric sets wie ghSiayons oy. oe Sis sheared 025 
Proximal diameter of femur................ 0.0.0 eee eee 008 
Width of lower leg. .sssceeesscedsccscsweseesssssweees -009 
Length of fibula...... 2.0... cece eee cece eee .015 
we Sf TATSAL, POMC s5i5s0 scat dou. autlatesoumiave eh weeny aedreree -006 
Ke OC OID acter seiaa nerven eee Uateres gene ea’ ese ten 027 
This salamander is about the size of the Menopoma allegheniense. 
IcHTHYCANTHUS PLATYPUS. Sp. nov. 
This batrachian is represented by almost the same portions of the skele- 
ton as the preceding species, furnishing a good basis of comparison. It is 
very well preserved. displaying the characters especially of the hind foot, 
which is almost entirely represented. 
Several features distinguish it from the J. ohiensis, one of which is of 
more than usual value if correctly indicated by the fossil. There are ten 
vertebre from anterior to the sacrum preserved in place, and none of them 
supports a rib, nor are there any ribs visible anywhere on the block of 
shale. I suspect that they exist on more anterior vertebrx, or may have 
been displaced to a more anterior position than they normally occupy. 
