892 MESSRS, 1). C. A. WTNDLB AND P, 0, PARSONS ON [D«5. 17. 



Ox (3(3), Mouflon (45), Duiker-bok (49), and Hyrax (68)— we 

 found that it was into the ulna ; but the exact attachment of this 

 muscle, like that of the biceps, can only be clearly seen after 

 careful dissection. There are many records of its insertion into 

 the radius which we dare not contradict ; but we can affirm that 

 in most of the animals in which we carefully dissected the muscle 

 it seemed at first to be fixed to the radius, and careful cleaning 

 was necessary to show that the real attachment was entirely into 

 the ulna. The only animal in which we found a distinct short 

 head from the front of the lower half of the humerus was the 

 Hyrax (6S\ but it was not present in Mivart and Minie's spe- 

 cimen (67). In Patersbifs and Dun's Elephant (79) a slip of the 

 muscle rose separately from the front of the upper tubercle <>f 

 the external condyle and continued separate to its insertion ; it 

 was supplied by the musculo-spiral nerve. 



The nerve-supply in the Pig (11), Peccary (14). Brocket (5J7), 

 Mouflon (45), and Duiker-bok (49) was entirely from the median. 

 not from the musculo-spiral or musculo-cutaneous. 



Triceps (Extensor lonrjus cubiti). — The usual three parts of this 

 muscle are always present, but they are liable to more or less sub- 

 division. The long or scapular head rises from half to nearly the 

 whole of the axillary border of the scapula, and is the largest of 

 all the heads : sometimes it can easily be separated into a ventral 

 and dorsal plane, the latter being the broader of the two : this 

 occurred in the Syrian Sheep (44), Mouflon (45), Duiker-bok (49), 

 and Elephant (77). The external head is small, and rises from 

 the posterior part of the neck of the humerus just under cover of 

 the origin of the brachialis anticus. Meckel (VII.) says that this 

 head is divided into two in Ruminants. The inner head rises 

 from the greater part of the posterior surface of the humerus. 

 Murie, in the Tapir (55) and Hyrax (57), found this head double, 

 and in the Giraffe (29) the same thing occurred. In Cuvier and 

 Laurillard's plates of the Pig (7) and Peccary (13), a separate 

 slip from near the angle of the scapula is figured ; but we failed 

 to observe this in our specimens of these animals, nor have we 

 found any other records of it. 



The nerve-supply of the triceps is entirely by the musculo- 

 spiral. 



Anconeus. — In spite of Lesbres's opinion that the anconeus is 

 always present in Ungulates, we believe that it is very rarely seen 

 as a distinct muscle. The only two animals in which it is at all 

 well marked are the Hippopotamus (1, 3) and the Elephant (74. 

 7s. 79). We presume that the nerve-supply is the musculo- 

 spiral. 



Epitrochleo-anconeiis. — This muscle is also wanting in the Ungu- 

 lates. The only record of it we can find is that Testut says it is 

 present in the Elephant ; but this specimen was probably an 

 individual variation, since Miall and Greenwood and the other 

 writers on the Elephant make no mention of it. 



Pronator radii teres. — This muscle is often absent, but when 



