386 
DR. R. W. SHUFELDT’s MORPHOLOGICAL 
palatine heads quite as much in proportion as we find them in 
adult skulls. 
The premaxillary and mandible are also largely formed in 
bone, more especially their tips and backward-extending limbs. 
Removing the skin from the back, I carefully count the ver- 
tebrae of the column two or three times, distinguishing 35 seg- 
ments, from which we may judge that 3 vertebrae are incor- 
porated in the pygostyle of the adult. 
Without any difficulty whatever, and by the aid of a 2-inch 
objective, I clearly make out the arrangement of the muscles of 
the fore limb, and distinctly perceive the tendon into which the 
tensor patagii brevis is inserted. Even still better can be seen 
the muscles of the thigh, where the biceps seems to arise by a 
double head from the pelvis, but otherwise the myological for- 
mula here is the same as I stated it above for the adult Trochilus. 
The plantar tendons also confirm all that is recorded in a pre- 
ceding paragraph. 
Coming next to the sternum , I find that even at this tender 
age the posterior margin of the body of the bone is rounded and 
unnotched. Six costal ribs articulate, on either side, with a 
“ costal border.” 
At the side of the neck in this specimen the oesophagus was 
much distended by a small spider and two small beetles ; but I 
believe that this represents food that the little bird had not 
swallowed at the time of its death, and that naturally no enlarge- 
ment takes place in the oesophagus at the point in question. 
We note that the bifurcation of the trachea is situated fully 
halfway up the neck towards the throat in this nestling, so that 
if the upper moiety of the anterior cervical region happens to be 
covered with the finger at the time of microscopical examina- 
tion, one is momentarily impressed with the notion that the 
bird has two tracheae, so unusual is this arrangement in the Class 
Aves. 
Upon opening the thorax and abdomen, it disclosed the fact 
that the sterno-laterales muscles of the trachea are not present, 
and I am inclined to believe that Trochili do not possess them. 
Further, we find the heart is in about the same position and 
relative size as it is in the adult ; but the lobes of the liver are 
proportionately much smaller, so much so that we can easily 
examine the intestines and stomach below their hinder borders 
without disturbing them, which ishiot possible in the adult. 
On the other hand, the stomach is proportionately much larger 
