ON THE ANATOMY OF PASSERINE BIRDS. 367 
In conclusion I have specially to thank Mr. O. Salvin for the 
extremely kind way in which he has placed at my disposal a large col- 
lection of mesomyodian birds in spirit. From this I have been able 
_ to make out the peculiarity in the distribution of the vessels in the leg; 
and from it also I hope to obtain materials for another paper shortly, 
in which the syrinx of some of the yet little-known forms will be 
described. 
EXPLANATION OF THE PLATES. 
Prare 21. (XLVIIT.) 
Fig. 1. View, from the outer side, of the muscles of the patagium of the left wing 
of Ramphastos cuvieri, the radius and ulna being bent at right angles to 
the humerus; #.p.l, tensor patagii longus; ¢.p.5, tensor patagii brevis; 
. e.m.r.l, extensor metacarpi radialis longus; ¢, triceps; 5, biceps; S.R, 
secondary remiges. 
2. Same of Icterus vulgaris. 
3. Same of Merops apiaster. 
PratTe 22. (XLIX.) 
Fig. 1. Same of Coracias garrula. 
2. Same of Buceros rhinoceros. 
3. Same of Musophaga violacea. 
a Prats 23. (L.) ; 
‘Fig. 1. Same of Urogalba paradisea. 
2. Same of Upupa epops. 
3. Same of Cuculus canorus. 
Prare 24. (LI.) 
Fig. 1. Same of Patagona gigas. 
2. Same of Menura superba. 
3. Same of Trogon puella. 
Prats 25. (LIL) 
Fig. 1. Syrinx of Menura superba, front view. 
2. Same, back view, with median fibrous attachment retained. 
3. Same, view of right side. 
4. Syrinx of Atrichia rufescens, front view. 
5. Same, back view. 
6. Same, view of right side. Page 519. 
7. Sternum of Atrichia rufescens ; f, radiment of furcula. 
2 Prats 26. (LIII.) 
: . Syrinx of Pitta angolensis. 
Same, back view. 
Same, side view (left). 
Syrinx of Pitta eyanura, 
Same, back view. 
. Same, side view (left). 
PAP hE 
