1901.] THE MUSCLES OF THE L'NGULAXA. 699 



distal phalanges of a variable number of digits. In the Hippo- 

 potamus (1, 3) tendons pass to all four digits. Gratiolet (III. 

 pi. v.) draws aud describes two distinct fleshy bellies which, uuite 

 below the dorsal annular ligament and again divide for the four 

 digits. In the Suidte the number of digits supplied varies a good 

 deal : for instance in the Domestic Pig (4, 5, 6, 7) there are three 

 fleshy bellies which are distributed with varying detail to all four 

 digits ; in the Red-River Hog (11) no tendon goes to the minimus ; 

 in one Peccary (13) there are four fleshy bellies which altogether 

 divide into eight tendons for the four toes in such a way that the 

 medius has one tendon for each phalanx, the annularis also three 

 tendons, while the index and minimus have one each ; in another 

 Peccary all the tendons are distributed to the medius and 

 annularis. 



In the Camelida) (15, 17, 18) there are slips for the medius and 

 annularis, the former having two. 



In the Tragulida 1 {'20, 21, 23) all four toes are supplied, though 

 here again the medius has two tendons. 



In the Cervidae (25, 26, 21, 28) and Griraffidie (29) only the 

 medius and annularis are provided with tendons. In (25) aud 

 (26) we fouud an extra small origin from the ulna. 



In the Bovidce (32, 33. 36, 38. 39, 43, 44, 18, 49) there are 

 two tendons for the medius and one for the annularis ; the muscle 

 is double almost from its origin, the more ulnar of the two 

 dividing for the medius and annularis, while the radial one passes 

 to the medius only and in many cases at all events ends in the 

 middle phalanx of that digit. The Musk-Ox (37) differs from 

 the rest of the BovidaD in having a tendon to the index from the 

 radial of the two fleshy bellies. 



The Tapir (53, 54, 55) has tendons for the index, medius, aud 

 annularis, aud our specimen (54) had in addition a slender slip 

 for the minimus. Murie (XVII.) noticed a small origin from the 

 ulna in his animal (oo). 



In th':' Equidse (56, 58, 60) there is a small origin from the 

 radius as well as the usual one from the external condyle; the 

 muscle divides into the usual two fleshy bellies, one of which 

 passes to the terminal phalanx of the medius, while the other joins 

 I he so-called extensor minimi digiti. 



In the Rhinoceros (63) there are tendons for all three digits. 

 In the Procaviidtu (67, 68, 71) all four digits have tendons, and 

 the same observation applies to the Elephaut (74. 77, 78). 



Two points strike one in reviewing this muscle in the Ungulata. 

 The first is that an extra origin from one of the forearm-bones is 

 often found ; the other that the muscle divides high up and forms 

 many tendons for few toes, so that two or more phalanges of one 

 toe may each be acted upon by its own tendon. This is the more 

 curious when one think- of the one function which the fore-foot 

 of an ungulate is called upon to play ; but the possible expla- 

 nation is that the muscle acta chiefly From the foot, and that when 

 this u planted on the ground the different Blips ad one after 



