866 MB. F. G. PABSOKS ON THE [NoV. 29, 



Scalene Muscles. — No scalene passes ventral to the subclavian 

 artery and brachial plexus ; there is therefore no scalenus ventralis 

 corresponding to the scalenus anticus of human anatomy. In 

 many hystricomorphiue and some myomorphine rodents this 

 muscle is present and rises from the basioccipital ; it does so in the 

 Dipodidae, and its absence in Pedetes is worthy, of notice. The 

 scalenus longus rises from the 2nd, 3rd, and 4th cervical 

 transverse processes and is inserted into the second rib only 

 instead of going to the anterior 4 or 5 ribs. The scalenus brevis 

 is deep to the last : it rises from the 2nd, 3rd, 4th, and 5th 

 cervical transverse processes and is inserted into the first rib. 



The Pectoral muscles correspond very closely with the descrip- 

 tion given on p. 259, P. Z. S. 1894. The pectorahs minor (5) is 

 inserted into the upper part of the pectoral ridge instead of going 

 to the coracoid and shoulder-joint. 



The Subclavius passes from the junction of the 1st rib with 

 the sternum to the outer half of the clavicle. 



The Scajaulo-clavicularis is absent. This I regard as a most 

 important point, as this muscle was found in all the hystrico- 

 morphine rodents examined, but was absent in the Dipodidae. 



The Deltoid has the usual three parts, with their characteristic 

 rodent insertion into the humerus. They are all supplied by the 

 circumflex nerve. 



The Teres major is wrapped round at its insertion by the tendon 

 of the latissimus dorsi as in the Dipodidae. 



The Flexor longus cuhiti (Biceps) has two heads, in the Dipodidae 

 there is usually only one. The insertion is into the radius. 



The Coraco-hrachialis rises from the coracoid process and is 

 inserted into the humerus from the middle to the internal condyle, 

 so that apparently the medius and longus are present. In the 

 Dipodidae the brevis may or may not be present. 



The Flexor Brevis Cubiti (Brachialis anticus) has the usual 

 external and internal heads, though they are closely fused. The 

 insertion is entirely into the ulna. No branch is received from 

 the musculo-spiral nerve, but there are two from the musculo- 

 cutaneous. 



The Extensor Lonyus Cubiti (Triceps) and Anconeus show nothing 

 of special interest. 



The Epitrocldeo-anconeus is present as usual. 



The Pronator Radii Teres passes from the supracondylar arch to 

 the middle of the radius. 



The Flexor Carpi Padialis has the usual attachments, its tendon 

 passes deep to the base of the radial ossicle or prepolles. 



The Palmaris Longus rises from the internal condyle and from 

 the surface of the flexor sublimis digitorum : in the lower part of 

 the forearm its tendon divides ; the inner and broader portion is 

 inserted into the radial ossicle at its most internal part as well as 

 into the ulnar ossicle ; the outer and narrower part is attached to 

 the middle of the internal border of the radial ossicle (see tig. 2). 

 In connection A\itb this it is interesting to compare the figure of 



