1882.] 



ANATOMY OF ERETHIZON DORSATUS. 



281 



half of the deltoid crest of the humerus, being much connected with 

 the adjacent part of the deltoid, and a portion running on to fuse 

 with the brachialis anticus. 



The sternocleido-tnastoid, arising as usual, is inserted into tlie 

 antero-posteriorly extending ridge just behind the opening of the 

 external auditory meatus. 



The levator claviculce arises, by a strong tendon, from the hypa- 

 pophysial tubercle on the middle of the ventral surface of the atlas. 



Fig. 9. 



The lumbo-sacral plexus of Erethieon dorsatus. 



Ant. cr, anterior crural nerve ; G. Sc, great sciatic nerve ; L, last lumbar 

 vertebra; /. Sc, small sciatic nerve; Ob, obturator nerve; P, pelvis; 

 S*, first sacral vertebra. 



Expanding in a fan-shaped manner, it is inserted into fascia in- 

 vesting the acromion and the greater tuberosity of the humerus, 

 its fibres mingling with those of the dorsal part of the panniculus 

 carnosus. 



The latissimns dorsi sends on a dorso-epitrochlear to the ole- 

 cranon. 



Proc. Zool. Soc— 1882, No. XIX. 19 



