PEROXEAL MUSCLES IN BIRDS. 1051 



flexor muscle of the third digit, after being joined by the tendon 

 from the peroneus, gave off not only the slip to the perforated and 

 perforating flexor of digit III which occurs in birds belonging to 

 many different groups, but also a slip to the perforated flexor 

 tendon of digit II, an arrangement which I have not noted or 

 found recorded in any other bird. 



The P. brevis was present in all the Tinamus I examined ; in 

 Rhynchotus it was veiy feeble and slender, arising from the greater 

 part of the length of the fibula and passing into a thin tendon 

 which flattened out, and passing under the slip to III had the 

 normal insertion. In Notliura its origin was from the lower 

 part of the fibula, and in Calodromas it was extremely minute 

 and reduced to a few fibres and a tendon just visible, but 

 running the usual course. The definite presence of the P. brevis 

 in Tinamus is in contrast with its equally definite absence in 

 most of the Struthious birds, but resembles the condition in 

 Apteryx, 



Galliformes. 



Mesitid^e. — I have had no opportunity of examining Mesiies, 

 and Milne-Edwards does not refer to the peroneal muscles. It 

 would be interesting to know their disposition, as in Euryj^yga 

 the tendon is characteristically long, and very difierent from the 

 arrangement in Galliform birds. 



Turnices. Ttcrnix d'ussumieri.- -The P. longus is present and 

 rather strong, with the three origins, a good anchor and slip to 

 III. The P. brevis is slender but arises from nearly three-quai-ters 

 of the shaft, from the fibula and tibia, and passes into a short 

 tendon which flattens out to the normal insertion. 



Galli. 



Megapodiidje. Talegalla lathami. — The P. longus is very strong 

 with large superficial and good fascial origins but no deep origin. 

 Anchor strong but narrow, and good slip to III. The P. brevis 

 is also good, from the posterior three-quarters of the shaft from 

 fibula and tibia. Tendon is very short, passes under a fibrous 

 bridge and then flattens out to pass to usual insertion. 



Cracidfe. Ortalis ruficauda. Mitua tuberosa. Pauxis galeata. 

 Penelope jntrpurascens. — In all these the P. longus is enormous 

 but chiefly from superficial and fascial origin, the deep origin being 

 just present. The anchor is very broad, short and strong, and the 

 slip to III is good. In some the tendon was ossified down to 

 the anchor. The P. brevis was strong, arising from the distal 

 three-quarters of the shaft, from the fibula, adjacent surface of 

 tibia and tibia distal to the end of the fibula. The tendon then 

 passed through a long fibrous bridge, partly calcified in Ortalis, 

 and flattened out to usual insertion. 



Gallidfe. Guttera cristata, G. edouardi, and G. puclierani. Mele- 

 agris gallo2Kivo. At-gus giganteus. Gcdlus gallus (2 examples). 



