28 MESSRS. MURIE AND MIVART ON THE 
Professor Owen does not make mention of the subclavius in Cheiromys ; but in our 
specimen it was well developed, and quite like that of L. catta. 
b. Shoulder and Scapular Regions. 
Detrom.—As Meckel' observes, this muscle consists of three distinct portions. 
The /irst of these arises from the middle third of the clavicle, and, descending obliquely 
somewhat outwards, closely joins the first part of the pectoralis major on the one side, 
and the second part of the deltoid on the other. (Pl. IV. fig. 12, D'.) 
The second and largest part of the deltoid arises from the acromion process only, and, 
descending vertically, is inserted into the deltoid crest on the outer surface of the 
humerus, extending considerably below the insertion of the first part of the pectoralis 
major. 
The third and slenderest part arises at the posterior surface of the spine of the 
scapula, from a quarter of an inch distant from the vertebral margin to the posterior 
end of the metacromion process. It passes very obliquely downwards and forwards, and, 
joining the second portion of the muscle, is inserted into the outer margin of the deltoid 
crest of the humerus, the fibres passing beneath those of the second portion of the 
muscle. 
In the other specimens of the genus Lemur we found this muscle existing in nearly 
a similar condition. In ZL. varius Cuvier represents it in three distinct portions in 
pl. 69. fig. 1, the clavicular portion being marked #, the two scapular portions £". 
In Galago crassicaudatus (Pl. II. fig. 8, Pl. III. figs. 5, 6, 7, and Pl. IV. figs. 13, 14, 
D', D2, and D’) the three divisions of the deltoid, with their scapular, clavicular, and 
humeral attachments, are displayed. 
We could not distinctly trace lines of separation in the deltoid of Galago allenii, 
although we remarked that the portion of the muscle between the attachments of the 
clavicle and coracoid process of the scapula seemed more fibrous than muscular. The 
third portion in L. catta was relatively smaller in G. allenii. 
In G. peli this muscle is said to consist of two parts united by tendinous joints’. 
The deltoid is said by Meckel* to be simple in Loris. We found it single in Nycti- 
cebus tardigradus. In Cuvier’s ‘ Recueil,’ pl. 67. figs. 1 & 2, # and &' (Loris), there is 
but a faint indication of division between the parts answering to the two scapular 
portions of Lemur, and no indication of any separation between the clavicular and 
scapular portions. 
In the anatomy of the Potto* (Perodicticus) no special mention is made of this 
muscle, and the figure of the shoulder-muscles displays but a slight tendency to division 
of the deltoid. 
' Op. cit. vol. vi. p. 258. * Kingma, Joc. cit. p. 23. 
+ Op. cit. vol. vi. p. 258. * Loe. cit. pl. 2. fig. 11. 
