OSTEOLOGY OF POLYGLYPHANODON—GILMORE DL 
fore feet preserved. Unfortunately the most perfect manus is pre- 
served in the matrix, palmar side up, and although it furnishes in- 
formation as to the digital formula, 
it contributes but little evidence as to 
the front view of the hand. That 
shown in figure 32 is based largely 
on specimen U.S.N.M. No. 15568. 
The metarcarpals have about the 
same proportions as in 7guana of 
similar size. Metacarpal IIT is long- 
est, IL and IV being subequal in 
length, I being the shortest of the 
metacarpus. 
The hand had the primitive for- 
mula 2, 3, 4,5, and 3. The proximal 
phalanges of digits II, ITI, and IV ay a 
are much shorter than the  corre- Ba 4) Rae eee ieee Poe 
sponding bones of the 7gvana manus, dy phanodon serie Galore: 
in this respect having a general like- U.S.N.M. No. 15568, viewed from 
ness to the feet of some of the the front, natural size: I, II, Hi, 
Permian Reptilia. The phalangials IV, and V, digits 1 to 5, respec- 
tively. Digit V has been restored 
articulate with one another by a 
A on the evidence furnished bv speci- 
tongue and groove, the tongue being men.U:S.N.M. No. 15816. 
on the proximal end. The lower 
proximal surface extends well back in under the grooved distal end 
of the next preceding phalangial. All the digits are clawed. The 
ungual phalanges are long, slightly curved dorsoventrally, and 
sharply pointed. 
Measurements of metacarpals of U. S. N. M. No. 15568 (in millimeters) 
Createst) length of metacarpal Wawa Oe ee ee ee ees 10.3 
Greatest lensthio£ metacarpallh [22 i 2 6 hee a eee ee ees 10. 4 
Greatestulengtn ofpmetacwnp aly MWh sees =e ee ee ee 10.7 
Greatest lengthy of metacarpal, 29s = eae Ls Se a ee 10.3 
The pelvis of the type specimen, U.S.N.M. No. 15477, is almost 
complete, lacking only distal parts of the pubes and a portion of the 
left ischium. The detailed description is based almost wholly on 
this specimen. Supplemental materials are the almost perfect pelves 
of U.S.N.M. No. 15568 and 15816, in articulated position (see pl. 25), 
and the left ilium, ischium, and pubis, the last lacking portions of its 
distal end, of U.S.N.M. No. 15566. 
The pelvis as a whole displays no departures from the typical lacer- 
tian structure, differing only in certain details from the pelvis of the 
existing Jguana, to which it shows many resemblances. 
Zlium.—When viewed from the side (see fig. 33) the ium is pro- 
duced as a rectangular bar upward and backward from the acetabular 
