Fig. 1. Dissection of right elbow of Prion desolatus, to show the disposition of the 

 tensor patagii muscles, as seen from above. 



Fig. 2. The same in (Estrelata brevirostis. 



Fig. 3. The same in Diomedea exulans. An arrow is passed between the twin 

 tendons of origin of the superficial part of the extensor metacarpi radialis longior. 



Fig. 4. The same in (Estrelata lessoni. 



Fig. 5. The same in Ossifraga gigantea. 



Fig. 6. The same in Pelecanoides urinatrix. H. Humerus. R. Radius. 

 b. Biceps muscle, t.p.l. Tensor patagii longus. t.p.b. Tensor patagia brevis. 

 e.m,e.m'. Superficial and deep bellies of extensor metacarpi radialis longior. e.m* 

 Inner of twin tendons of origin of its superficial belly, b.s. (in fig. 3). Biceps slip. 

 f. Fasciculus of patagial tendons continued on to ulnar fascia. a,a'. Ossicles developed 

 at origin of the extensor metacarpi radialis longior. t.p.' (in fig. 5). Special slip from 

 patagial tendons to deep belly of extensor metacarpi 7'adialis longior. 



Fig. 7. Dissection of right wing of Majaqueus csquinoctialis, to show origin and 

 general disposition of the tensor patagii muscles. Lettering as above ; also t.p. 

 Common belly of tensor patagii longus and brevis. t.p.l'. Cushion of elastic tissue, 

 developed in the tendon of the tensor patagii longus (t.p.l.) at its origin from the 

 humerus, e. Elastic pad, developed in the marginal tendon of tensor patagii longus, 

 opposite the elbow. d. Deltoid muscle. l.d. Latissimusdorsi (insertion), n. Cir- 

 cumflex nerve. 



