ANATOMY OF THE LEMUROIDEA. 59 
tions into the last six ribs, interdigitating with the external oblique. Owen does not 
refer to this muscle. 
Sacro-LuMBALIS':—Rapidly narrowing after emergence from the general mass of the 
erector spine, the sacro-lumbalis is inserted by tendons into the posterior (inferior) 
borders of all the ribs, except the thirteenth, taking fresh origin (as the accessorius) by 
tendons springing from the anterior (superior) margins of the nine or ten hindermost ribs. 
In L. vanthomystax it has attachments by muscular fibres to all the twelve ribs 
present ; the outer tendons are attached to the nine anterior ribs only. 
Figured in Galago crassicaudatus (Pl. III. fig. 6, and Pl. IV. figs. 9 & 10, 8.7). 
In G. allenii it is small and thin, and branches from the longissimus rather behind 
(below) the last short rib. It is attached to all the ribs. 
Its attachment to the ribs in Nycticebus tardigradus is from the fifteenth to the first. 
In Tarsius® it appears to agree very nearly with J. catta, as it does substantially in 
Cheiromys. 
The CERVICALIS ASCENDENS is the continuation of the preceding muscle (sacro-lumbalis) 
forwards. It is separately inserted by a single tendon into the transverse process of the 
seventh cervical vertebra. 
See dissection of Galago crassicaudatus (Pl. IV. fig. 9, C.as). 
Burmeister * speaks of a continuation of the sacro-lumbalis to the transverse process 
of the seventh cervical vertebra; but the muscle he compares with the cervicalis 
descendens has nothing to do with it, but is the cervical part of the semispinalis. 
Lonaissimus porsi *:—Having origin from the parts adjoining the conjoined lumbar 
muscular mass, this is ultimately inserted into the anapophyses and transverse processes 
of the lumbar and dorsal vertebrae by tendons. 
In Nycticebus its origin is from the eleventh dorsal vertebra; the other Lemurs, 
Galago, Tarsius, and Cheiromys, agree with L. catta. It is shown in Galago crassicau- 
datus (Pl. III. fig. 6, and Pl. IV. figs. 9 & 10, Lo.d). 
The TRANSVERSALIS CERVICIS continues the foregoing muscle to the transverse processes 
of the seventh, sixth, fifth, and fourth cervical vertebre. 
In ZL. varius and L. xanthomystax it extends up to the third cervical vertebra. 
It is delineated in Galago crassicaudatus (Pl. IV. fig. 9, Tr.c). 
In Nycticebus tardigradus it reaches from the seventh to the second cervical vertebra 
inclusive. In Tursius* this muscle continues up to the atlas, being attached to the six 
first cervical vertebre. 
SPrINALIs DoRsI.—We could not satisfactorily define this as a distinct muscle in Lemur 
catta, as it seemed inseparable from the fibres of the longissimus dorsi. ‘The other 
genera examined by us did not exhibit any clear line of demarcation. 
! Figured by Cuvier in Z. catta, pl. 71. fig. 2, C. 
2 Loc. cit. p. 40, tab. 4. fig. 4, B. + Loc. cit. p. 40. 
* Figured by Cuvier in Z. catta, pl. 71. fig. 2, B. 5 Loc. cit. p. 38, tab. 4. fig. 4, f. 
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