ANATOMY ON THE LEMUROIDEA. 23 
comes from the anterior (upper) border of the first rib, and is inserted by two tendons 
into the transverse processes of the sixth and fifth cervical vertebre. All these portions 
are placed outside the brachial plexus. 
Galago crassicaudatus (P1. IV. fig. 9, Sca.', and Pl. V. fig. 16, Sca.! & Sea.) agrees with 
L. varius. 
In G. allenii the scalenus medius arises as high as the transverse process of the 
fourth cervical vertebra. The scalenus posticus does not seem to reach higher than the 
sixth. The scalenus anticus is a small bundle of fibres which pass to the first rib in 
front of the lowest nerve of the brachial plexus. 
In Zarsius there are three fasciculi (muscles according to Burmeister’) arising from 
the first three ribs, and going to the cervical vertebra from the sixth to the first. 
In Cheiromys this muscle is just as above described in L, catta, except that the anterior 
portion extends back to the fourth rib. Owen does not mention this muscle. 
e. Vertebral Region (Posterior and Superior). 
Spentus.—This muscle is very intimately connected with the transversalis cervicis, 
and arises from the spines of the first three dorsal vertebra, the last cervical vertebra, 
and ligamentum nuche. ‘The larger and anterior (superior) portion of the muscle (the 
splenius capitis) is inserted into the occiput; the smaller and posterior (inferior) part 
(the splenius colli) into the transverse processes of the first three cervical vertebra, as 
Cuvier has shown (pl. 71. figs. 1 and 2, I and I’). 
In ZL. varius the splenius colli is inserted into the transverse processes of the first four 
cervical vertebra, in Z. zanthomystax only to the first three cervical vertebre ; but there 
is also a little separate slip carried onwards to behind the ear. 
No line of demarcation exists in Galago crassicaudatus by which splenius capitis and 
splenius colli can be differentiated. The muscle representing the splenius capitis, or, it 
may be, both divisions (Pl. II. fig. 6, Sp. ep), arises from the uppermost second dorsal 
and spines of all the cervical vertebra, and is inserted into the outer three-fourths of 
the superior curved line of the occiput. 
In G. allenii the splenius capitis is as in Z. catta; but we found a small slip between 
the splenius and longissimus, which may represent the splenius colli®*. 
In Nycticebus tardigradus the splenius is exceedingly large; and our observation 
confirms Meckel’s’, that there is no splenius colli. 
In Zarsius‘ it arises from the spinous process of the first dorsal vertebra. It goes 
mainly to the occiput; and a part (representing the splenius colli) is inserted into the 
transverse process of the atlas. 
In Cheiromys it arises from the first five dorsal vertebre. 
Compiexus.—This is large, and has origin from the transverse processes of the first 
1 Loe. cit. p. 37. tab. 4. fig. 9, ¢.c.c. 2 P,Z.S. 1865, p. 243. 
3 Op. cit. p. 141. 4 Loc. cit. p. 37, tab. 4. fig. 9, d. 
