ANATOMY OF THE LEMUROIDEA. 19 
Van Campen' mentions its similar position in the Potto, and Burmeister® in Tarsius. 
The Sryto-nyom is a small but very distinct muscle in Lemwr catta, arising in com- 
mon with the posterior belly of the digastric, and being inserted as in Man. 
In L. varius its insertion is shown by Cuvier, pl. 68. fig. 1, s. 
It is of moderate size in L. canthomystaz, and is pierced by the tendon of the digastric 
muscle. This is contrary to what Meckel says occurs in the Lemurs; his words are * 
“dans les makis, ot le muscle en question passe en dehors du digastrique, au bord 
postérieur du mylo-hyoidien et au bout antérieur de lV’abaisseur de I’hyoide, sans 
simplanter a l’os hyoide.” 
The stylo-hyoid in the Grand Galago arises rather within and along with the stylo- 
glossus than in common with the digastric. See Pl. V. fig. 18, Sy.A, the digastric 
having been removed. 
Burmeister ‘ remarks that in Tarsius the digastric does not penetrate the stylo-hyoid 
muscle. 
Besides the stylo-hyoid muscle, Meckel speaks * of another extra muscle as existing in 
the Lemurs but which is absent in Apes andin Man. This he terms the masto-styloidien, 
in contradistinction to the true stylo-hyoid or elevator of the hyoid. This masto- 
styloidien, according to him, stretches from the tympanum to the styloid process, and 
differs from the stylo-hyoid and stylo-glossus, which come from the tympanic process. 
The Sryxo-GLossvs arises beneath the external meatus in front of the origins of the 
stylo-hyoid and digastric. It is inserted as usual into the outer side of the tongue. 
In Galago crassicaudatus (P1. V. fig. 18, Sy.g) it is similar. 
This muscle presents no noteworthy difference in Tarsius® from what is said above of 
Lemur catta. 
STYLO-PHARYNGEUS.—This muscle arises (behind the stylo-glossus and within the origin 
of the stylo-hyoid and digastric) from the surface of the auditory bulla, and is connected 
with the anterior cornua of the os hyoides. It is inserted as usual. 
In Galago crassicaudatus (Pl. V. fig. 18, Sy.ph) and in Perodicticus this muscle is 
essentially as in L. catta’. 
d. Vertebral Region, anterior and lateral. 
RECTUS CAPITIS ANTICUS MAJOR.—In Lemur catta this is a long and slender muscle 
which arises from the transverse processes of the cervical vertebre from the second to 
the sixth, and is inserted into the basioccipital. 
In L. xanthomystax tendons only go to the sixth, fifth, and fourth cervical vertebre ; 
but there is another layer beneath, which sends a slip to the third cervical. 
In Galago crassicaudatus (V1. V. fig. 16, R.a.ma) it would appear as if this muscle 
1 Loe. cit. p. 25. 2 Loe. cit. p. 34, tab. v. fig. 13, v. 
3 Anat. Comp. vol. viii. p. 770; see also p. 753. 4 Loe. cit. p. 35, tab, v. fig. 12, ¢. 
5 Loc. cit. vol. viii. p. 770. 6 Loc. cit. p. 3d, tab. v. fig. 12, 7, 7 Potto, l.c. p, 26. 
D2 
