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126 Bulletin American Museum of Natural History
[Vol. LIX
the specimen described above. The femur measured 25 mm. in length
in this specimen as against 15 mm. for the humerus of Macrerpeton;
the fibula 15 mm. as against 10 mm. for the radius. A posterior rib in
this specimen, 29 mm.; and an anterior one of Macrerpeton about 30
mm.
There is thus considerable ground for assigning this lost specimen to
Macrerpeton. The only seemingly valid objection is Cope's mention of
rod-like scutellae; but a disturbed group of rhombic
scutes might well have presented such an appearance
if covered with a film of matrix.
The type of Leptophractus deani was described
by Moodie as a nearly entire mandible, but is
obviously the posterior portion of a dentary. The
Fig. 22. Macrer- teeth are apparently similar to those of the present
peton huxleyi. Ven- species.
tral scutes presum- The relationships of Macrerpeton with Baphetes
ablytobeasociated
and Loxomma cannot be adequately discussed in the
absence of more adequate knowledge of these forms.
with this form, X 3.
That it is similar to the Baphetes suggested by
Watson's figure (1925, Fig. 4a) of the palate. Orthosaurus is apparently
somewhat more specialized.
Orthosaurus sp.
This form, so abundant in the Pennsylvanian of England (cf.
Watson, 1925), is not represented in the Linton material available to me.
Professor Watson, however, informs me that a single specimen seemingly
of this genus is present in the British Museum material.
CRICOTIDS
Cricotus of the Permo-Carboniferous (Wichita Group) of Texas
appears to be a late survivor of a group of embolomerous amphibians
widespread in the Pennsylvanian, and represented at Linton as well as
in the European Coal Measures. A characteristic feature is the presence
of large fenestrae on the inner surface of the lower jaw.
Leptophractus lancifer (Newberry)
Rhizodus lancifer NEWBERRY, 1856, p. 99; 1873, p. 342, P1. xxxix, fig. 9; SMITH
WOODWARD, 1891, p. 348.
Rhizodus incurvus NEWBERRY, 1856, p. 99; SMITH WOODWARD, 1891, p. 348.
Leptophractus obsoletus COPE, 1873, pp. 340-341; 1875, pp. 400-401, Pls.
viii, xxxix, figs. 1-3: MOODIE, 1916, pp. 167-168.