248 Mr. W. P. Pycraft on the 
The Pectoral Limb. 
The pectoral limb of the Colies presents no very marked 
peculiarities. It is non-pneumatic, and has the humerus 
and manus subequal and longer than the forearm. The 
humerus has the crista superior triangular in shape, an 
unusually small fossa subtrochanterica, a feebly marked sulcus 
transversus, and a moderately deep incisura capitis. There 
are no ectepicondylar or eutepicondylar tubercles, nor is 
there any tubercle on the palmar surface for the attachment 
of the extensor metacarpi ulnaris. 
The ulna has but a feebly developed olecranon process, 
and the radius is straight, 
The manus is moderately long, has the Mc. III. strongly 
bowed, while the Me. II. develops a small intermetacarpal 
plate. The pollex shews a vestige of an ungual phalanx. 
The Pelvic Limb. 
The femur, which is moderately long and slender, presents 
no characters of importance in the present connexion. 
The tibio-tarsus is long and slender, and has the ento- 
cnemial crest well developed and produced upwards to a 
rather considerable extent. The fibula is short. The 
condyles at the lower end of the shaft are laterally com- 
pressed ; the inner condyle is conspicuously the larger of the 
two, and separated from its fellow by a deep intercondylar 
gorge, which is crosséd above by an ossified extensor 
bridge. 
The tarso-metatarsus has the trochlez placed all in the 
same horizontal plane, the mesotrochlea being the largest 
and projecting slightly beyond the level of its neighbour on 
either side. Trochlea II. is much reduced, forming a small 
rounded knob with a faint median groove. In this arrange- 
ment of the condyles the tarso-metatarsus of Colius differs 
conspicuously from that which obtains in Cypselus, a 
fact which is all the more peculiar since both are pampro- 
dactylous. 
The hypotarsus is compound, taking the form of a flat 
