20 MESSRS. MURIE AND MIVART ON THE 
descended to the fourth dorsal vertebra, its fibres joining those of the first part of the 
longus colli. In another specimen this thoracic continuation was less distinct, the 
muscle, however, clearly went as far as the seventh cervical transverse process, there 
indefinitely merging into the said portion of the longus colli. 
We noted in Galago allenii this muscle to be strongly developed. It arises by two 
tendons from the transverse processes of the seventh and sixth cervical vertebre, and is 
inserted as in Lemur catta. A deeper portion, however, also exists, which comes from 
the upper cervical vertebre (their transverse processes) to the atlas, and terminates with 
an insertion similar to that of the superficial portion. This may be the anterior division 
of the longus colli. 
Special mention of this muscle is not made by S. van der Kolk and Vrolik, although 
they remark’ that the long muscles of the neck give great power of flexion to this animal. 
In our own recent examination of Loris gracilis we have found it to be like that of 
Nycticebus tardigradus. The latter animal, according to our observations’, has the 
rectus capitis anticus major of great magnitude, and with an origin as far back (low 
down) as the body of the sixth dorsal vertebra. (See woodcut, fig. 11, R.c.a.maj.) 
Fig. 11. 
Deep muscles in front of the neck of the Slow Loris 
(Nycticebus tardigradus). 
R.c.a.maj. Rectus capitis anticus major. 
R.c.a.min. Rectus capitis minor. 
L.c. Longus colli. 
The skull is cut in such a transverse manner as to 
leave only the basioccipitals and tympanic bull 
present.—From P. Z. 8, 1865, p. 242. 
Van Campen® says it exists as usual in the Potto. Tarsius* has it arising from the 
five upper cervical vertebre. 
In Cheiromys this muscle is enormous, though not mentioned by Owen, who probably 
mistook it for the longus colli, which it in some respects resembles. It arises from the 
sides of the bodies of the first three dorsal vertebra and transverse processes of all the 
cervical vertebra except the first. It is inserted into the basioccipital and also into the 
inner side of the auditory bulla (Pl. VI. fig. 31, R.a.ma). 
* Stenops, op. eit. p. 44. * P. Z.8. 1865, p. 241. * Loc, cit. p. 26.  * Loc. cit. p. 39, tab. 5. fig. 14, n. 
