18~.] 575 [Cope. 



The abdominal chevrons are more anterior in position than are those of 

 the I. ohiemis. The hind legs are longer than in that species ; in this 

 one tlie femur equals seven and a-half vertebral centra in length. The 

 external digit on the other hand, while bearing Ave 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 

 vertebrie become rapidly more slender, and also diminish in length, while 

 the zygapophyses are continued to the fifteenth vertebra, where the series 

 is broken ofi". The chevron bones are slender, and enclose a moderate 

 lifemal 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 fihulare and intermedium coossi- 

 fied. The tibiale 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 — 1 5 — 5 ; 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 vertebrae 045 



" fifteen caudal " 055 



" " the centrum of a dorsal 0038 



Total elevation of a posterior dorsal 014 



" of posterior of zygapophysis of dorsal 010 



Length of femur 032 



Diameter of femur medially 0045 



" " distally 0083 



Length of fibula 018 



Diameter of fibula proximally 007 



Width of sole at second row of tarsal bones 017 



Length of foot to end of third digit 031 



" first digit 010 



"third " 022 



"fifth " 020 



