332 
DR. R. W. SHUFELDT’S MORPHOLOGICAL 
Nest, passing to the consideration of the tibia , we find its 
shaft to be nearly straight, being but slightly convex forwards; 
while for the greater portion of its midcontinuity it is of a sub- 
cylindrical form, changing only as it approaches its enlarged 
extremities. At the proximal end of the bone the pro- and. 
ectocnemial ridges on its anterior aspect are considerably sup- 
pressed, and soon merge into the shaft below ; they are nearly 
of equal size, and the cnemial crest above them does not rise 
above the tibial summit. 
Although the condyles at the distal end of the bone are very 
similar to these protuberances as they are commonly found in 
the majority of small birds, they are yet peculiar in having 
between them, below and behind, a mid- and well-marked longi- 
tudinal ridge, constituting a feature that at this moment I do not 
remember to have noticed among the tibiae of the class. 
On the anterior aspect of this tibia, just above the condyles, 
we notice the usual longitudinal tendinal groove, spanned at its 
lower part by an osseous bridgelet thrown directly across it. 
The tarso-metatarsus has a length equal to rather more than half 
the length of the tibia, while the calibre of its shaft is about one 
third less than that of the latter bone. This tarso- metatarsal 
shaft presents three plane and ungrooved surfaces, an anterior 
one and two lateral, or rather postero-lateral, ones. The summit 
of the bone is moulded in the usual manner for articulation with 
the tibial condyles. Behind the proximal extremity of the bone 
we find a fairly well-developed hypotarsus, vertically pierced by 
two tendinal canals placed side by side. 
Passing to the distal end of the tarso-metatarsus, we find the 
trochlese so disposed as to accommodate themselves to the zygo- 
dactyle condition of the podal digits, which consists, as we know, 
in Trogons of a permanent reversion of the second toe. 
These digits have their bony phalanges arranged upon the 
most usual plan as we find it in the vast majority of living birds, 
i. e. 2, 3, 4, and 5 joints for the first, second, third, and fourth 
toes respectively. 
Considered as a whole, although the skeleton of the foot of 
this bird is in due proportion with the rest of the limb, it never- 
theless strikes us as being rather a delicately formed structure. 
The accessory metatarsal possesses a shape usually assumed by 
it among birds, but in the present instance makes a very close 
