1901.] ANATOMY OF ClIC,YSOCnLOB.IS TIlEVELYANl. 29 



Thospleuiiis capitis, biventer cervicis, and complexus agree with 

 Dobson's descriptions. The scalenus anticus (ventrahs) rises froin 

 the transverse processes of the 5th and 6th cervical verrebrae and is 

 inserted into the first rib ventral to the subclavian artery and 

 brachial plexus. 



There is no spleuius colh, and the so-called biveuter cervicis, 

 altliough it is quite a separate muscle from the complexus, is not 

 at all biventral. 



The trachelo-mastoid is present and distinct. 



The rectus abdominis or rectus ventrahs, as it would be more 

 appropriate to call it, agrees with Dobson's description in C. tn- 

 veh/ani and 0. villosa. After the closest scrutiny I could detect 

 no indications of lineso transversa;. 



The external obhque rises from the 5th to the 17th i-ibs. 



The internal obhque is well developed and distinct iu the 

 posterior (caudal) portion of the abdomen, but is hardly marked at 

 all in the anterior part. 



The transversalis in its attachments and direction of fibres 

 agrees with Dobson's descriptious. 

 ^ Both the sterno-costalis and pyramidalis are absent. 



Muscles of the Fore Lhnh. 



The muscles of the pectoral region and shoulder agree with 

 Dobson's description, with the following exceptions : — 



The teres major is a small muscle entirely unconnected with the 

 latissiaius dorsi. It has the usual attachments and it is evident 

 that the muscle which Dobson calls teres major is really part of 

 the triceps. 



The teres minor is absent, the origin of the middle head of the 

 triceps is so great that there is no room for it. The muscle ^diich 

 Dobson describes as te'-es minor is really teres major. 



The latissimus dorsi agrees with Dobson's description, but there is 

 a tendinous intersection in it opposite the elbow m one specimen, 

 not in the other two. The levator scapulae and levator claviculte 

 are just as Dobson described them, but they are distinct at their 

 insertion. I am inclined to regard them as a longitudinally split 

 levator claviculse or trachelo-acromial muscle, because this is the 

 only mammal I have even seen with two muscles in this position. 

 Elsewhere ^ I have stated my i-easous for regarding the trachelo- 

 acromial muscle as a fixer of the scapula for the scapular head ol 

 the triceps to rise from, and it is probable that the extra size of that 

 head in this animal is correlated with the double-fixing muscle. 



The supra- and infra-spinati have the usual attachments, but the 

 former is much the larger of the two. 



The subscapularis is very thick, rising as it does from the deeply 

 concave fossa. A great many of its fibres rise behind the axillary 

 border from the front of the tendon of origia of the middle head of 



1 '-Muscles of Maininals," Journal of Anatoiuy, vol. xxxii. p. 428. 



