1897.] NEW YORK ACADEMY OF SCIENCES. 357 



groove by a very strong transverse humeral ligament, which 

 passes from the combined insertion of the Entopeetoral and ab- 

 dominal portion of Ectopectoral into the radial tubercle of the 

 humerus to the ulnar tuberosity, blending with the insertion of 

 the Subscapularis. The two heads of the Biceps unite a little 

 above the middle of the arm. 



The larger part of the muscle is inserted by a strong tendon 

 into the tuberosity of the radius. From the ulnar margin of the 

 muscle near the insertion a smaller portion develops a ver}- well 

 marked semilunar fascia which passes caudad and mesad to fuse 

 with the deep antibrachial aponeurosis. 



The Lemuroidea as a suborder present remarkable variations 

 in regard to the arrangement of the Biceps in the various genera. 



According to Murie and Mivart (1, p. 3.3) the glenoid and 

 coracoid heads, as above described for Lemur hrunevs, are 

 present in L. catta, L. varius and L. niger, the coracoid head in 

 in the latter form remaining quite distinct from the glenoid head 

 for a considerable distance. L. macaco (12, p. 30) also con- 

 forms to the same type. 



Perodicticus, Tarsius and Cheiromys each possess double 

 tendinous heads of origin. 



In all the Galagos examined by Murie and Mivart the long 

 head, arising from the upper margin of the glenoid cavit}', is 

 arranged as in Lemur ; but the coracoid head remains distinct 

 and separate almost to the insertion, receiving, however, a few 

 fibres from the glenoidal portion near the bend of the elbow. 

 The authors describe the coracoid portion as being very remark- 

 able, remaining broad, flat and muscular down to the insertion, 

 which is into the fascia covering the forearm. 



Meckel (Vol. VI., p. 291) describes but a single (glenoid) head 

 in Loris. Murie and Mivart (I , p. 33) also found only one head 

 in the same animal, although Cuvier (H, PL LXVII., fig. 2, r 

 and r') represents two heads. 



Murie and Mivart also found but one head of origin in Nycli- 

 cebus tardigradus (Proc. Zool. Soc. 1865, p. 244), which agrees 

 with W. Vrolick's earlier observation (Todd's Cyclop. Anat. and 

 Phys., Vol. IV., p. 218;, although in his later conjoined memoir 

 with S. Van der Kolk the authors describe two heads. 



The analysis of the Lemuroid Biceps from the above data 

 would therefore result as follows : 



M. Glenoradialis ; 

 Loris gracilis. 

 Nyclicebus tardigradus. 



Mm. GLENORADIALlS-f-CORACORADIALIS : 



Lemur catta. 



and all other species of Lemur. 



