254 Prof. J. C. Galton on the Myology 



end of the ulna, and is also inserted into tlie pisiform, whicli 

 it draws outwards and backwards. This seems to answer to 

 the " abaissem' " of Cuvier. 



An analogous muscle, he says, arises from the flexor tubercle 

 of the humerus, and is attached to the anterior end of the tip 

 of the pisiform, of which it is likewise an abductor. 



These muscles, of which I have given both Meckel's and 

 my own description, appear to be factors of a highly differen- 

 tiated flexor carpi ulnaris. 



From the internal condyloid ridge, immediately below the 

 origin of the pronator teres, and covering the origin of the 

 flexor carpi radialis, arises the flexor sublimis of the third 

 digit. Immediately below, and in company with the condyloid 

 origin of the flexor profundus and flexor carpi ulnaris, the 

 flexor sublimis of the index arises. Their tendons pass over 

 the anterior annular ligament of the wrist, and, after splitting 

 to allow of the passage of the tendons of the deep flexor, are 

 inserted into either side of the distal end of the first phalanx 

 of their respective digits. 



The flexor profundus has two large heads of origin : — 



1. From the upper half of the ulnar edge of the radius, 

 being coextensive with the insertion of the supinator brevis. 



2. To a like extent from the inner (ulnar) edge of the ulna, 

 and from the homologue of the coronoid fossa of anthropotomy*, 

 also by a strong tendon from the internal condyloid ridge. 

 The stout common tendon passes under the anterior annular 

 ligament (which intervenes between it and the superficial 

 flexors) ; and its terminal branches pass to the bases of the 

 ungual phalanges of the two functional digits. 



A tliin muscular slip arises from the tendon of origin of the 

 flexor profundus from the condyle, and is inserted by a deli- 

 cate tendon into the dorsal aspect of the anterior annular 

 ligament. 



A strong ligamentous strap binds down the tendons of the 

 flexores sublimes and profundi at the point where the latter 

 pierce the former. 



According to Meckel (Vergleich. Anat. iii. p. 559), the third 

 digit only has a "perforated" flexor. 



The slip which passes to the annular ligament seems to be 

 a rudimentary homologue of a muscle which is present in M. 

 tamandiia^ and is termed by Rapp (Anat. Untersuch. liber die 

 Edentaten, p. 48) " Spannmuskel des Ligamentum annulare.'''' 



* This slip appears to answer to one which I have described and figured 

 (Trans. Linn. Soc. vol. xxvi. p. 546, and pi. 44. fig. 1) as existing in 

 Dasyims, 



