174 



THE VOYAGE OF H.M.S. CHALLENGER. 



Figs. 2 & 3. [ d 1 . First dorsal iuterosseus. 



d 2 . Second dorsal iuterosseus. 



d 3 . Third dorsal iuterosseus. 



d*. Fourth dorsal interosseous. 



t. Fibrous slips connecting the tendons of the second and fourth dorsal 



interossei, with the heads of the adjacent metacarpal bones. 

 e. Abductor hallucis. 

 l d. Abductor minimi digiti. 

 g 1 . Flexor brevis pollicis. 

 g h . Flexor brevis minimi digiti (outer head). 

 ' h. Adductor pollicis. 



a. Adductor indicis. 



b. Adductor annularis. 



c. Adductor minimi digiti. 

 a.b. Fleshy fasciculus belonging to the palmar layer and connecting the bases 



of the index and annularis. 

 u.n. Ulnar nerve, dividing into superficial and deep branches. 

 d.n. Twig from the deep branch of the ulnar for the supply of the contiguous 



sides of minimus and annularis. 

 m.r.n. Medio-radial nerve. 

 d.b. Dorsal branch of medio-radial nerve. 

 u. Tendon of flexor carpi ulnaris. 

 Fig. 4. Dissection of the side of the chest, axilla, and upper arm of the Cuscus — left side. 

 2^. Pectoralis quartus. 

 r.t. and r.t 1 . Rectus thoracis. 

 p 2 . Pectoralis minor. 

 p\ and p 2 . Pectoralis major. 

 s.c. Subclavius. 

 s.n. Nerve to subclavius. 

 cl. Clavicle. 

 c.d. Clavicular deltoid. 

 c. Coracoid process. 

 c.b.b. Coraco-brachialis brevis. 

 c.n. Circumflex nerve. 



m.c.n. and m.c.n 1 . The two parts of the musculocutaneous nerve. 

 l.d. Insertion of the latissimus dorsi. 

 m.s.n. Musculo- spiral nerve. 

 b. Biceps, 

 o.o. Braehialis anticus. 



