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19301
Romer, The Pennsylvanian Tetrapods of Linton, Ohio
Two main types may be distinguished, both of which are represented
at Linton; one with an elongate body with a well developed ventral
armor, and with a skull which perhaps is rather "normal" except for
elongation; the other with little or no ventral armor, but with the tabular
region of the skull produced into long horn-like structures. Both groups
are common in the Pennsylvanian, and both are represented in the American
Permo-Carboniferous by end forms. In addition, there are a number
of forms of rather uncertain position, such as Scincosaurus of Bohemia,
with Ctenerpeton-like armor, Sauravus of the French Carboniferous,
MLepterpeton from Jarrow and probably others.
UROCORDYLIDZ
This family includes several carboniferous genera.
It is represented
by Urocordylus of Huxley (1867) from Ireland and Bohemia, and selveral
American forms. All have elongate bodies, with the vertebrae characteristic
of the Nectridia, an elongate tail, limbs of moderate to small size, a
somewhat elongate head, and a well-developed ventral armor. The
family is typically Pennsylvanian, although there is no doubt that
Crossotelos, of the Wichita, was a late survivor of the group.
There appear to be three members of this family in the Linton material:
(1) a form best represented by Ctenerpeton alveolatum (most of the
remains of which are usually incorrectly placed in Oestocephalus); (2) and
(3) two smaller forms with shorter neurals and hsemals commonly
described as Ptyonius, more correctly as Sauropleura.
Ctenerpeton remex (Cope)
Sauropleura remex COPE, 1868, pp. 217-218; 1871, p. 53.
Oestocephalus remex (partim) COPE, 1869, p. 17, Fig. 2; 1871, p. 41; 1871b, p. 53;
1875, pp. 381-386, Figs. 9 ("3"), Pls. xxxii, Fig. 2, xxxiv, Fig. 4; SCHWARZ, 1908,
pp. 86-87, Figs. 29-30.; MOODIE, 1909a, p. 27; 1916, pp. 143-145, Figs. 3, 8.
Ctenerpeton alveolatum COPE, 1897, pp. 83-84, P1. iii, fig. 1; MOODIE, 1909a,
p. 24, P1. x; 1916, pp. 166-167, Pls. xix, xxiii, fig. 2.
TYPES.-S. remex, 6903 (Cope, 1875, Fig. 3), C. alveolatum, NM 4475.
Urocordylus was first described by Huxley (1867, pp. 359-362, P1.
xx) from Kilkenny; a good idea of much of its general appearance may
be gained from his plate. Girdles and both anterior and posterior limbs
are present; the ventral armor consisted of rather broad thin scales
arranged in chevron. The caudals are especially characteristic, with
very tall and fluted hemals and neurals. An American form which is
very closely related is that included in the above synonymy. Its general
characteristics, as far as known, may be seen in Moodie's plate of
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