300 



MR. F. E. BEDDAKD ON THE 



[Feb. 18, 



by the late TV. A. Forbes, upon the dissection of which the following 

 notes are based. 



As to external characters, the pterylosis offers no salient point 

 of difference from that of the Gulls as described by Nitzsch. The 

 oil-gland is tutted. There are 12 rectrices. The bird is aquinto- 

 cubital. As regards the alimentary -viscera the most impoi'tant 

 fact to comment upon is the rudimentary and nipple-like character 

 of the caica. 



The tensores patagii are illustrated in the drawing exhibited 

 (woodcut, flg. 1). They are exactly like those of liissa tridactyla, 



Fig. 1. 



Muscles of the pataginm of Bhynchops. 

 t.p.l; tendon of tensor patagii longus ; t.p.h,, tensor patagii brevis ; B, its wrist- 

 ward slip ; P, patagial fan ; A, teiidiuous threads ou ulnar side of arm. 



of which I possess a drawing by Mr. W. A. Forbes. There are 

 two tendons to the tensor brevis, of which the anterior is for the 

 greater part of its length made up of three separate strands. The 

 hinder tendon is much slighter. The anterior tendon gives off a 

 little way from the forearm a wristward slip (flg. 1, B), from which, 

 where it joins the tendon of the extensor radialis metacarpi, a 

 patagial fan (F) arises which joins the longtis. This fan as well as 

 the main tendon of the brevis are continued over to the ulnar side 

 of the forearm as a diffuse glistening tendon. From the point 

 where the wristward slip of the brevis springs there is another con- 

 nection with the lowjus, which is lettered A in the drawing (flg. 1). 



