]^12 MB. B. H. BUBNE ON [Feb. 19, 



the fingers would seem to warrant the name. Lumbricals as 

 described by Macalister I was unable to find, and in this agree 

 with Hyrtl. 



Professor Wilson \ in a critical survey ot the myology ot the 

 fore-limb— called forth by an examination of the muscles of 

 Notorydes typhlops— notices Macalister's description of these 

 mui^cles in Chhmydophorus, and expresses the belief that probably 

 Macahster's flexor sublimis is part of the flexor profundus, a belief 

 in which I entirely concur. He accepts Macalister's palmaris 

 longus, and finally suggests that Macahster's short flexors are in 

 reahty the flexor 'sublimis still confined entirely to the hand as it 

 is found in Ornithorhynchus and Eeptiles. This suggestion is one 

 of great interest if well founded, but it is, I fear, not borne out by 

 my dissection. 



The two heads of the Flexor carpi ulnaris (text-fig. ld,Jl.c.ul.) 

 were far more separate than in Macalister's specimen ; in fact 1 he 

 humeral head formed an independent little muscle with an inde- 

 pendent, though very delicate tendon inserted with that of the 

 ulnar head on the pisiform. This muscle seems in Edentates 

 to be liable to considerable subdivision, e. g., in Cyclothurus it 

 consists of 4 separate bundles ^ 



The intrinsic muscles of the hand were not observed with 

 sufficient accuracy to warrant any statement, except that, roughly 

 speaking, they agreed with Macalister's description. 



There is a superficial muscle (palmaris brevis, text-fig. 15, pl.hr.) 

 of some size running diagonally across the palm of the hand from 

 the base of the pisiform bone to the base of metacarpal i. This 

 muscle does not appear to have been previously noticed. 



The Extensor carpi raclialis (text-fig. 13, e.c.r) was inserted into 

 the bases of metacarpals ii, iii by a single tendon situated exactly 

 between them. In Macalister's specimen the tendon was double, 

 and iu Hyrtl's single and inserted upon metacarpal ii only. 



The Extensor carpi ulnaris (text-fig. 13, e.c.u.^ had an origin from 

 the upper part of the ulna, not mentioned by Macalister. 



The following muscles were also present : — Retro-clavicularis 

 (text-fig. 14, cl.). Deltoid (text-figs. 13 & 14, dlt.). Supraspinatus. 

 Infraspinatus (text-fig. 13, i.sp.). Teres major (text-fig. 15, t.mg.). 

 Subscapularis(text-&g.l5,s.sc.). biceps (text-fig. 15, bi.). BracJiialis 

 anticus (text-fig, 13, br.a.). Supinator brevis. Extensor communis 

 digitorum (text-fig. 13, e.c.d.). Extensor annularis (text-fig. 13, 

 e.ann.). Extensor minimi digiti (text- fig. 13, e.d.Y). Extensor ossis 

 metacarpi pollicis (text-fig. 13, e.m.p.). Extensor indicis (text- 

 fig. 13, e.i.). The Supinator longus was absent. 



Muscles of the ~KmT)-LiMB.— Obturator extemus {text-^g. 17, 

 obt.ex.) is a well-marked triangular muscle rising from the veiitral 

 border of the obturator foramen, deep to the adductors and inserted 

 by a round tendon upon the femur just proximal to the lesser 



1 Wilson : '_' On the Myology of Notorydes typklops." Trans. E. Soc. South 

 Australia, xviii. 1894, p. 44. 

 ^ Macalister, 1. c. p. 249. 



