o/" Cjclotluirus didactylus. 253 



insertion by the lower la^'er of the supinator longns. There 

 was, as seems to be the case in all Edentata yet examined, no 

 trace of a coronoid head*. 



The pronator quadratns was exceedingly Avell developed. 

 It covers the palmar surface of the radius and ulna from their 

 distal end up to the insertions of the biceps and brachialis 

 anticus. Meckel makes no mention of this muscle, nor does 

 it appear in Cuvier's plates. The pronator quadratus is pre- 

 sent in all Anteaters, both American arul African. 



A muscle (palmaris longus ?) arises from the olecranon, in 

 close connexion with the dorso-epitrochlien. Its tendon passes 

 to the radial side of the wrist, where it terminates in the palmar 

 fascia. 



A large mass of muscle arose from the tip of the pisiform 

 bone, and was attached on one side to the rudiments of the 

 fourth and fifth digits, on the otlier to the rudimentary pollex, 

 while anteriorly it was continued into the palmar fascia. 



The muscles attached to the pisiform, one of the most impor- 

 tant hones, funcfio7iaIl7/ cons'ideved, in the manus of the animal 

 with whose anatomy we are concerned, are very numerous ; 

 but their homologies are by no means easy of determination f. 



From the lowest portion of the inner condyloid ridge of the 

 humerus rises a muscle (dexor carpi ulnaris?) which soon 

 divides into two slips, the upper of which terminates by ten- 

 don at the anterior part of the os pisiforme, while the inferior 

 slip has a broad fleshy attachment to the lower or palmar sur- 

 face of the same bone. 



A muscular mass arose from the lower third of the dorsum 

 of the ulna, and was inserted into the upper part of the pisi- 

 form bone. 



Another and larger mass took origin from nearly the wiiole 

 length of the inner (ulnar) edge of the ulna, and was inserted 

 into the pisiform immediately below the muscle just described. 



Cuvier figures (pi. 257. lig. 1) a muscle as arising from the 

 lower third of the ulna and terminating at the tip of the pisi- 

 form bone : this he terms " abaisseur du pisiforme." 



Meckel describes a muscle coming from the tip of the ole- 

 cranon, and inserted at the inferior free edge of the pisi- 

 form, which bone it draws away from the two great fingers 

 {i.e. index and digitus medius). Another muscle (according 

 to him, lying in the same plane) takes origin from the distal 



* Prof. Macalister, " Ou tlio Nature of the Coronoid Portion of the 

 Pronator Radii Teres," Journ. Anat. & Pliys. ser. 2. vol. i. p. 0. 



t ''Die Bt'Ug-eseite der Hand," says ^loclcol (Ardiiv, p. 47), " onthnlt 

 dagegen wenigstens sechs vevschiedone, Icleino Muskeln, welcho grossten- 

 theils dem grossen Erbseubein angehoreu." 



AnfudcMaj.X.IIisf. Ser. 4. TV. iv. 18 



