346 
DR. R. W. SHUFELDt’s MORPHOLOGICAL 
are in each case very well developed, while pectoralis tertius is 
quite small and insignificant in comparison even with the second 
pectoral. It arises mainly from the shaft of the corresponding 
coracoid, and only the extremities of its most posterior-reaching 
fibres arise from the sternum, and not as in many other birds, 
where a proportionately good share of its bulk may spring from 
this last-named bone. 
All these pectoral muscles are inserted into the humerus in 
a manner common to the great majority of the class Aves, and 
require here no special remarks upon that point. 
Notes on the Anatomy of the Pelvic Limb. 
When examining that group of muscles of the thigh used so 
successfully by him iu classification, Garrod dissected specimens 
of Caprimulgus europceus and Chordeiles texensis , almost identi- 
cally the same forms as those before us. In them he found that 
they possessed the “ femoro-caudal, the semitendinosus, the 
accessory semitendinosus, and the postacetabular portion of the 
tensor fasciae;” but “the ambiens and the accessory femoro- 
caudal are absent.” (Coll. Mem. p. 192.) 
My observations tend to confirm these results for the genus 
Chordeiles , and enable me to say that the same statement holds 
good for Antrostomus ; both limbs of the birds before me were 
carefully examined, and all the muscles of the thigh dissected 
out. I also saw that the main artery of the limb was the 
sciatic , as it is in the majority of birds. 
Passing next to the foot, I dissected out the plantar tendons 
of both feet in the Whip-poor-will, and the same parts in both feet 
of Chordeiles texensis and C. texensis , var Jlenryi. 
Here again I can confirm the observations of Professor 
Garrod, who found that in Caprimulgus europceus “ the two deep 
flexors descend beyond the ankle-joint independently, as usual ; 
after passing which, generally about one third down the tarso- 
metatarse, they blend completely before any slip has been given 
off. Prom the conjoined tendon thus formed, the tendons of 
distribution spring, four in number, one to the hallux and others 
to each of the three anteriorly directed toes (see Collected 
Memoirs, fig. 4, p. 292), that to the hallux being generally sepa- 
rated off before any of the others.” {Op. cit. p. 294.) 
It struck me, however, that in Chordeiles the tendon of the 
