352 TRANSACTIONS OF THE [OCT. 4» 



It is interesting to note that in tlie Cynomorphous monkeys, 

 and in those of the New World, the usual human arrangement of 

 the external abdominal ring obtains. PI. XXXV., fig. 2, shows 

 the inguinal region in a specimen of Gebus suhcristaius^ Gr^'^yr 

 the Bonnet Sapajou (Body weight 2,630 grms., Brain weight, 80 

 grms. Identified by Professor J. A. Allen, December 17, 1895). 

 In this animal the tj'pe common to man and the higher apes is 

 already fully developed. The External oblique aponeurosis di- 

 vides to form a large ring, the medial pillars interlacing closely 

 in the median line and forming a triangular plate, whose pointed 

 apex is inserted into the ventral surface of the pubic symphysis. 



In the published descriptions the above arrangement of the 

 External oblique aponeurosis has not been mentioned as occur- 

 ring in other Lemurs. 



Murie and Mivart (I, p. 51) describe the External oblique in 

 Lemur catta as a very elongated muscle, arising b}^ digitations 

 from the fifth to the twelfth rib incl.,the three upper digitations 

 being interposed between corresponding ones of the Serratus 

 anterior ; also arising from the lumbar fascia beneath the Latis- 

 simus dorsi, and behind (below) that muscle, and from the an- 

 terior superior spine of the ilium. Insertion" into the Aponeu- 

 rosis of the abdomen," closely connected anteriorly (above), at 

 its inner border, with the Rectus. 



The authors quoted describe the external abdominal ring of 

 L. catta as follows : '• The fascia forms a wide and rather elon- 

 gated abdominal ring, the inner pillar of which is much the 

 stronger, and is inserted into the anterior margin of the pubis. 

 The fibres composing the external pillar are more delicate, and 

 interlace with those covering the C remaster, which muscle is 

 much developed." The authors figure the muscle in Galago 

 crassicaudatus (1, PI. II., fig. 3, PI. III., figs. 5 and 6, and PL 

 IV., fig. 9, Ex. 0.) and state (1. c. p. 52) that in " Nycticehus 

 tardigradus there is no variety in its attachment." 



In Perodicticus Van Campen (3, p. 28) describes the muscle 

 as arising from the eight lower ribs. 



Burmeister (6, p. 45, tab. 3, fig. 1, No. 1) finds that in Tarsius 

 spectrum the muscle arises from all (the rib-cartilages up to the 

 third. 



Allen (13) does not describe the muscle in Tarsius fuscus. 



Lucffi (12, p. 35) merely states that in Lemur macaco the 

 abdominal muscle (?) presents nothing deserving special notice, 

 only remarking that the Rectus arises by a strong tendon from 

 the first rib and passes to the sj^mphysis. 



