696 MESSRS. Pi. C. A. WINDLE AiSJ) F. G. PAKSOKS ON [DeC. 1 7, 



that it is almost fibrous ; but in other specimens (52, 54, 55) both 

 heads seem present though small. 



In the Horse neither Bronn (VI.) nor Chauveau (II.) mention 

 the olecraual head, while Lesbres says that it is very slight. 

 In the Rhinoceros (63, 64) both heads are present. 



Among the Subungulata also both heads are present and well 

 developed in ITyras (67, 68) (see text-fig. 91) and Elephas (74, 

 78,79). 



Fle.vor profandvs diffitorum. — As we ha^'e pointed out else- 

 Avhere, the flexor profundus of a generalized mammal consists of 

 three heads from the internal condyle — condylo-radial, condylo- 

 central, and condylo-ulnar — and one each from the radius and 

 ulna. In Man the condylar heads are usually suppressed ; but 

 in Ungulates the ulnar and especially the radial heads ai'e feebly 

 developed. In the Hippopotamus (3) the three condylar heads 

 are distinct, and there is a small ulnar origin from the olecranon. 

 In (1) Gratiolet and Alix only mention one condylar origin and 

 one from the ulna ; but in addition it is very interesting to note 

 that they found a continuatioi* from the triceps to the muscle, 

 winding round the internal condyle in the same way that we have 

 already recorded among the Edentata in Myrmecophaga , Tamandua, 

 Cycloilmrus, and Orycteropus (P. Z. S. 1899, p. 330). The muscle 

 divides into four tendons for the index, medius, annularis, and 

 minimus. 



In the Suidse (11, 14), as one would be inclined to expect, all 

 the five origins of the generalized muscle are present, and the 

 insertion is into all four digits. 



In the Tragulida? our specimen (21) showed only one large 

 condylar head, an ulnar from the olecranon, and a vei'y small 

 radial, but Kin berg made out two condylar origins in his speci- 

 men (20). The insertion is into the medius and annularis. In 

 the Watei'-Ohevrotain (DorcatJierium) Chatin found one condylar, 

 one ulnar, and one radial origin, and tendons passed to all four 

 digits. 



Among the Cervidse, the Deer (26) had a condylar, olecranal, 

 and radial head, while in the Brocket (27) there wei'e : (1) con- 

 dylo-ulnaris, which was the largest ; (2) condylo-radialis, next in 

 size; (3) ulnaris, from olecranon only; and (4) radialis, smallest 

 of all. Tendons only passed to the medius and annularis digits. 



In the Griraffe (29) the origin seems to correspond with that of 

 the Brocket. 



In the Bovidse (35, 36, 37, 40, 44) there are either one or two 

 condylar origins as well as a radial and ulnar. The Duiker-bok 

 (49), however, is remarkable for having all three condylar origins 

 and no radial. The insertion in this family is into the medius 

 and annularis only, except in the Musk-Ox (37), where there are 

 two very small tendons for the lateral digits. In the Tapir Murie 

 (XVII.) notices the presence of the condylo-ulnar slip, and the 

 insertion is into all four digits (52, 55). In our specimen (54) 

 there were (1) condylo-ulnar, (2) condylo- central, (3) ulnar 



