. Carnegie Institution of Washington publication. 130 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. plete phalangeal formula for the hand of Amphibamus is unknown. The third digit seems to have 4 elements. The formula 2-2-3-2 has been suggested (462). The pelvis is very satisfactorily known. The ilium is a long, slender, straight rod, with expanded ends. The ischium is shown on both sides of the vertebral column in the Yale specimen. Its form is almost identical with that of Paleokattcria longicandala Credner, from the Rothliegenden of Saxony. The ischia are apparently approximate in the median
. Carnegie Institution of Washington publication. 130 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. plete phalangeal formula for the hand of Amphibamus is unknown. The third digit seems to have 4 elements. The formula 2-2-3-2 has been suggested (462). The pelvis is very satisfactorily known. The ilium is a long, slender, straight rod, with expanded ends. The ischium is shown on both sides of the vertebral column in the Yale specimen. Its form is almost identical with that of Paleokattcria longicandala Credner, from the Rothliegenden of Saxony. The ischia are apparently approximate in the median line, though this character is somewhat obscured by the impression of the caudal vertebra?. Their relation with the ilium, other than that they were posterior to it, is uncertain. The pubis is, apparently, calcified cartilage. It is a squarish plate, somewhat corrugated, lying anterior to the ilium in the Dan- iels specimen. The elements of the pelvis were undoubtedly hung loosely in the flesh, as in modern salamanders, since there is no indication of articular surfaces. The hind limb is well known, the type having a nearly complete leg with the foot. The Daniels and the Yale specimens supplement and substantiate the type. The femur is longer than the humerus, but more slender, with its articular surfaces. FIG. 28.—Restoration of probable appearance of Amphibamus grandiceps Cope on the basis of the material described herewith. X about as well developed as in the humerus. The element is a simple rod of bone without muscular crests of any kind. The tibia and fibula are, likewise, slender separate rods of bone. The tarsus is unossified. The phalangeal formula is 2-2-3- 4-3, and is fairly definite. In the type specimen the matrix in the orbit was blackened as if by the pignien- tnni iiigntin of the choroid. The same has been noticed in other specimens. Pro- fessor Cope thought this indicated that the animal was nocturnal. There are many characters in Amphibamus which seem t
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