1877.) 575 {Cope. 
The abdominal chevrons are more anterior in position than are those of 
the I. ohiensis. The hind legs are longer than in that species; in this 
one the femur equals seven and a-half vertebral centra in length. The 
external digit on the other hand, while bearing five phalanges, is distinctly 
shorter. The fibular tarsal is of a transverse oval, not quadrate, form. 
The dorsal centra are short and deeper than long; the neural arches are 
elevated, with short but distinct zygapophyses, and a flat subquadrate, 
superiorly truncate neural spine. They bear short, vertically compressed 
diapophyses near the bases of the arches. The neural spines of the caudal 
vertebree become rapidly more slender, and also diminish in length, while 
the zygapophyses are continued to the fifteenth vertebra, where the series 
is broken off. The chevron bones are slender, and enclose a moderate 
hemal arch. 
The femur is gradually expanded to the extremities. Proximally there 
is a trochanteric ala besides the obtuse head. Distally the condyles are 
well distinguished, the external or fibular being truncate. The fibula is 
less than three-fifths the length of the femur, and is expanded at both ex- 
tremities. Two proximal tarsals are distinct ; the one next the fibula is 
larger than the other and transverse suboval in form. It has a median 
dividing ridge as though composed of the fibulare aud intermedium coéssi- 
fied. The tdiale is subtriangular. There are five distinct phalangeal tar- 
sals. The toes are in the order of their lengths beginning with the shortest, 
1—_2—5—3—4. Their phalanges (including metatarsals) are, in the 
proper order, commencing with the hallux, 3—3—4—?5—45 ; the distal end 
of the fourth finger being lost. These bones are rather stout, and the un- 
guals are simply conic. The form of the foot is short and wide. The 
number of phalanges is nearly similar to that I have found in the Amphi- 
bamus grandiceps, excepting that in that species the fifth digit has but four. 
They are more numerous on most of the digits in Sauropleura digitata. 
Measurements. M. 
Length of ten dorsal vertebre..............- aseaiasicie 045 
et “* fifteen caudal ‘6 1... eee eee cee tee cnet eee 055 
Be «« the centrum of a dorsal..........--.eeeeeee 0038 
- Total elevation of a posterior dorsal...........--..---- .014 
«of posterior of zygapophysis of dorsal............ .010 
Length of femur. .......e.ees eee eee e eee eect eeeces 032 
Diameter of femur medially.......-.-s.sseeee rece eee e -0045 
te fe se distally 2.2.22. cece cece eee e ee ecees .0083 
Length of fibula. .......-- cee eee e cece eee eee ee eeee 018 
Diameter of fibula proximally. ...........0. se eeeee eee -007 
Width of sole at second row of tarsal bones...........+ 017 
Length of foot to end of third digit.........-....-++5- -031 
‘ “ first Gigit.......2cceeeee cece tence eee eeeee -010 
“e eet ipds 88 sassuew 2-5 so bg Waleed s-s-0s. geareacreneees 022 
re CC-AftD: fo g.a's'cemipaela ese a peewee ee: Gleseins .020 
