ANATOMY OF THE LEMUROIDEA. 35 
It has been twice referred to by Owen in Cheiromys, pp. 59 and 61. 
Biceps '.—With two distinct heads; the short head arises from the coracoid process, 
the long head from the superior margin of the glenoid cavity. The two heads unite a 
little below the middle of the arm and_are inserted by a strong tendon into the posterior 
part of the tubercle of the radius. 
In ZL. niger we found a slight approximation to the structure (next to be described) 
in Galago. 
In all the Galagos we examined, the long head springing from the upper margin of 
the glenoid cavity is as in Lemur; but the coracoid head remains almost distinct from 
the former down to its insertion, receiving, however, a few fibres from the glenoidal 
portion about the bend of the elbow. 
The coracoid portion is very remarkable, as it remains broad, flat, and muscular down 
to its insertion, which is into the superficial fascia covering the forearm. Its free margin 
projects forwards inside the arm at the end of the elbow more than does the supinator 
longus at the outside of the limb. This condition must powerfully assist the flexing 
action of the muscle. (Figured in Galago crassicaudatus, Pl. II. fig. 3, Pl. III. figs. 5 & 7, 
and Pl. IV. figs. 13 & 14, B’, B’.) 
In G. peli it was found to have two heads by Kingma’. 
In a recent dissection of Loris gracilis made by us, the biceps sent but a single head 
to the scapula. Meckel* says the Loris has only along head. Cuvier represents two 
heads, pl. 67. fig. 2,7, and 7’. 
In Nycticebus tardigradus* we found but one head of origin, which agrees with W. 
Vrolik’s earlier observation ®, although in the later conjoined memoir with S. van der 
Kolk® they speak of two heads. 
Perodicticus', Tarsius*, and Cheiromys® each possess double tendinous heads of origin 
to the biceps muscle. In Cheiromys the expansion mentioned as existing at the insertion 
of the muscle in Galago does not exist. We carefully looked for it. 
CoRACO-BRACHIALIS.—Double"; the long part arises exclusively from the inner side 
and deep surface of the strong tendon of the short head of the biceps, no muscular 
fibres arising from the coracoid process itself. Narrowing rapidly downwards, it is 
inserted into the inner border of the humerus as far down as the upper border of the 
perforation in the inner condyle. 
The short part, which is very small, arises from the end and deep surface of the 
coracoid process, and is inserted on the posterior side of the inner margin of the 
1 Cuvier, Joc. cit. pl. 68. fig. 2, pl. 69. fig. 1, r and r} (LZ. varius). ? Op. cit. p. 24, 
3 Op. cit, vol, vi. p. 291. 4 P.Z.8. 1865, p. 244. 
5 Todd’s Cyclop. of Anat. and Physiol. vol. iv. p. 218. 
© Op. cit., Rech. d’Anat. comp., le Genre Stenops, p. 45. 7 Loe. cit. p. 34. 
8 Loe. cit. p. 51, tab. 3. figs. 1 and 2. nos. 20a and 20d. 9 Loe. cit. p. 60, pls. 22 and 23. fig. 1. 20. 
‘© Cuvier figures in Z. varius this muscle as double; but both parts have the same letter gq, pl. 68. fig. 2. 
VOL. VII.—PART I. F 
