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ANATOMY OF THE LEMUROIDEA. 
In G. allenii the transversalis is pretty much interwoven with the internal oblique, 
but corresponds tolerably well in attachments with what has been said of Z. catta. 
Perodicticus‘ has this muscle rather thin; fibres from it and the internal oblique go 
to form a cremaster. 
In Tarsius® it is very thin and difficult to separate. 
In Cheiromys it is very closely adherent to the internal oblique, and is not more 
muscular than the latter. 
ReEctus ABDOMINIS.—In Lemur catta this muscle, arising as usual, is inserted with 
strongly marked tendinous fibres into the first rib, the outer margin of the manubrium, 
and the sternal end of the cartilages of the second rib. We could find no indication of 
any of the nine tendinous intersections stated by Meckel®* to exist in Lemur mongos. It 
is very broad at its origin. 
In LZ. varius the muscular fibres stop at the second rib, and a tendon proceeds to the 
first one. Only a delicate tendon goes to the second rib at its sternal end. ‘There is 
also a tendinous intersection, oblique in direction, and situated about two inches in 
front of the pubis. In this species Cuvier has only represented a small part of the 
thoracic portion of this muscle, pl. 69. figs. 1 and 2. 15. 
In L. xanthomystax it nearly corresponds to what is said above of L. catta, and is 
strong and fleshy, excepting in the pectoral region, where it is thin. On the left side 
of the specimen examined by us, its fibres appeared to be continuous with the external 
oblique ; and thus the digitations of this muscle may by Meckel* have been considered 
to belong to the rectus abdominis. 
It is also continued by a long band of longitudinal fibres to the first rib in Galago 
crassicaudatus (Pl. II. fig. 38, Pl. III. fig. 5, and Pl. V. fig. 16, R.ad). 
In G. allenii it arises from the first rib, and receives slips from opposite the fourth, 
fifth, and sixth ribs. It reaches the cartilages of the lower ribs; and its fibres unite 
with the external oblique. 
Nycticebus tardigradus* has the muscular band carried to the first rib. 
In Perodicticus® and Tarsius’? there are no tendinous intersections, but each has a 
similar insertion into the first rib. 
In Cheiromys this muscle is not noticed by Owen any more than are the other 
abdominal muscles. We found it to ascend to the first rib in a broad, flat, muscular 
band, becoming tendinous at the second rib, the tendon being inserted into the middle 
third of the first rib. It passed beneath the supracostal, aud at so great a distance 
from the sternum that at first we thought it was the second supracostal (of L. catta), 
which muscle may perhaps form part of it. ‘The tendon of the subclavius meets that of 
the rectus on the inner side of the latter. This muscle has no tendinous intersections. 
It is remarkably broad at its pubic origin. 
* Loc. cit, p. 29. * Loc. cit. p. 46, tab. 4. fig. 9. no. iv. ® Loe. cit. p. 201. * Loe. cit. p. 201. 
5 Pp. Z. 8. 1865, p. 248. § Loc. cit. p. 28. 7 Loe. cit. p. 40, tab. 4. figs. 2 & 9. no. ii. 
