444 



MR. W. A. FORBES ON THE 



[May 16, 



towards their insertion, and dilated apically. There are two carotid 

 arteries. 



In the leg, the ambiens and accessory femoro-caudal muscles are 

 absent, as are the gluteus quintus and primus. The femoro-caudal, 

 semitendiriosus, and accessory semitendinosus are all well developed. 

 The mj'ological formula is thus — A. XY. The obturator internus 

 is triangular. The deep plantar flexor tendons of the toes blend 

 about three quarters down the leg, the slip to the hallux being given 

 off from the inner of the two tendons a little before it joins the other 

 one. 



The pectoralis secundus extends nearly to the end of the sternum. 

 There is no third pectoral, nor biceps slip to the patagium. The 

 expansor secundariorum muscle, on the other hand, is well deve- 

 loped, the long thin tendon ceasing on the axillary margin of the 

 teres muscle in a way hitherto only known in some of the Grallinaceee'. 

 I find, however, that exactly the same coudition occurs in Momotits 

 (lessoni) and Hylomanes {jgularis), iu some of the Alcedinidae (e. g. 



Fig. 1. 



A. B 



Syrinx of Todus : A, from before ; B, from behind. 



Tanysiptera, Syma, and Cittura), as also in Steatornis. The 

 presence of this muscle at all in these groups of birds was, I may 

 remark, hitherto unknown^. The tensor patagii brevis at its termi- 

 nation has an arrangement almost identical with that of the Momo- 

 tidae ^ only differing from it in the absence of the thin slip of fascia 

 which is continued, in them, from the recurrent " passeriniform " 

 tendon to the fascia covering the ulnar side of the forearm. The 

 deltoid has no special tendinous slip of origin from the scapula. 



' Cf. Garrod, Coll. Pajjers, p. 324. 



^ Besides the Coraciida;, the existence in which of this muscle was pointed 

 out by Garrod (Coll. Papers, p. 324), it exists also of the same " cicoiiiiform '' 

 shape in the Meropidas, Leptosoma (P. Z. S. 18S0, p. 470), and, as already noted 

 in MS. by Garrod, in the Galbulidie. It is absent in all (? Bucconida;) the 

 other families of Anomalogonatte. 



" Cf. Garrod, loc. cit. p. 359. 



