308 
I)K. It. W. SIHJFELDT’S MORPHOLOGICAL 
PI. XVII. fig. 2 of the present memoir. This muscle arises from 
the inner surface of the shin at the lower part of the neck, 
its fibres converging as they pass towards the shoulder to 
terminate in a small and delicate tendon, which accompanies the 
tendon of the tensor patagii long us in the free marginal fold 
of the patagium, and merges with it about halfway between the 
humerus and carpus. When I come to discuss this muscle in 
the Hirundinidce I will enter more fully upon it, its relations, 
and the birds wherein I have thus far detected its presence. 
14. The musculature of the lower larynx of Ampelis cedrorum 
is of a very perfect Acromyodian type ; I distinctly make out 
five pairs of intrinsic muscles inserted, as usual in Passeres, into 
the ends of the three upper bronchial semi-rings ; and, in addition 
to these, there is a well-developed pair of sterno-tracheales. 
These lower laryngeal muscles are here not only firm and 
fleshy, but easily individualized — a feat best accomplished with 
a pair of dissecting-needles, under the 2-inch objective of a good 
microscope. 
Both in structure and position, then, the syrinx of Ampelis is 
of a typical Passerine type. 
15. Turning next to the pectoral muscles, I find all three — the 
pectoralis major , the p. secundus , and p. tertius — to be present 
and fully developed. They also have their usual origins and 
insertions. 
16. In examining the muscles of the thigh, with their vessels 
and nerves, I find that the ambiens and accessory femoro-caudal 
are both absent, while the femoro-caudal, the semimembrauosus, 
the semitendinosus, and accessory semitendinosus are all present. 
The main artery is the sciatic ; the main nerve the sciatic nerve; 
and the main vein the femoral. 
In all of these particulars Ampelis cedrorum agrees with the 
highest types of Passerine birds. 
17. At the lower third and at the back of the tarso-metatarsus 
I find in both feet that the tendons of the fiexor longus hallucis 
and the fiexor profundus digitorum are not connected by a fibrous 
vinculum. This is also another Passerine character. 
18. In examining the heart and great vessels, I find but one 
carotid artery — the left one— passing up in front of the vertebrae 
in the neck. 
19. I find the nostrils in Ampelis but very feebly partitioned 
from each other by a median membro-cartilaginous septum. 
