330 KANSAS UNIVERSITY SCIENCE BULLETIN. 
MEASUREMENTS OF THE TYPE OF ERIERPETON BRANCHIALIS MOoopIr. 
Length of entire impression................... 50 
Length of mandible along median line.......... 10 
Widthvofmandibulariramuss seer eeeee os 9 
lenethwof sbasibranchial sash ect eene 7A 5/53 
Widthiofabastbranchia lease cee eer eee “D 
henoth wofebypoliyally. s.r octane Meniee eee 2.4 
Wadthvotebypoliyalls;.).1,- vj siettiecieetine iene 1.5 
Genus MICRERPETON, Moodie, 1909. 
This genus was established by the writer on a single ex- 
cellently preserved specimen (No. 12,313, University of Chi- 
cago). The genus is readily distinguished from other mem- 
bers of the Branchiosauride by the large size of the orbits, 
the short, heavy limb bones, the slender ilium and the ex- 
panded, elongate and flattened tail. 
Micrerpeton caudatum Moodie, 1909. 
There is but a single species known. It is fully described 
in previous papers. (Journal of Geology, vol. xvii, No. 1, 
pp. 39-51, with seven figures, 1909; Journal of Morphology, 
vol. xix, No. Ay pp. 516-520, with three figures, 1908.) 
Genus EUMICRERPETON, Moodie, 1910. 
Amer. Natl., vol. XLIV, June, 1910, p. 367. 
This genus is based on well-preserved remains of three in- 
dividuals from the Mazon Creek shales. One of the speci- 
mens represents, apparently, an adult, and the others are im- 
mature. The manner of the impressions resembles in a marked 
degree those described by Thevenin from the Commentry beds 
of France (plate 14). The nodules which inclose the remains 
measure, respectively, two and one-quarter and two and one- 
half inches in long diameter. 
The generic characters are found in the very broad posterior 
table of the skull, with its short longitudinal length, the re- 
duction of the tympanic notch and the short length of the 
body. The body length of Humicrerpeton is as 2 to 4, while 
that of Micrerpeton is as 2 to 5, and that of Branchiosaurus 
fayoli is as 2 to 414. The entire impression of the branchio- 
saurians from Saxony are not preserved, so that comparative 
measurements are not possible. Other generic characters are 
found in the sharp supratemporal angle of the skull, and it is 
to be distinguished from Micrerpeton especially by the short, 
stumpy limb bones, Its distinctions from the genera of Euro- 
