346 



DE. R. W. SHTJFELDt'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 Limh. 



When examining that group of muscles of the thigh used so 

 successfully by him in 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 Antrostomtis ; 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 Henryi. 



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- 

 nietatarse, they blend completely hefore 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 



