18/2.] MR. A. SANDERS ON LIOLEPIS BELLI. 163 



Ohliquus interims and transversalis are attached by their ventral 

 edge to the border of the rectus abdominis, and by their dorsal to all 

 the dorsal ribs, to the four anterior at the point of junction of the 

 vertebral with the sternal segments, and to the point corresponding in 

 the posterior ribs ; posteriorly they are attached to the side of the 

 quadratus lumborum ; their anterior attachments were missed ; they 

 are both situated on the ventral or visceral side of the ribs : the fibres 

 of the internal oblique go from above downwards and forwards ; those 

 of the transversalis are transverse. 



Intercostales (figs. 6 & 13) are continuous with the external border 

 of the sacro-lumbalis ; they fill up the spaces between all the ribs. 

 Anteriorly they commence by a tendinous border, which has the 

 following attachments, viz. one end to the point of junction between 

 the scapula and the coracoid bone, dividing the two sections of the 

 subscapularis, the other end to the external angle of the sternum ; 

 from this tendinous border are derived two ligaments, one joining the 

 posterior angle of the coracoid, the other joining the long head of the 

 triceps muscle. That part which fills up the spaces between the four 

 anterior dorsal ribs consists of two layers : the external has the fibres 

 directed backwards and slightly downwards ; this extends only to the 

 junction of the vertebral with the sternal ribs ; of these the anterior 

 set differs from those that follow, inasmuch as they arise from the 

 last cervical and are inserted into the second dorsal rib, not being 

 attached to the first rib : the internal layer belongs more especially 

 to the sternal ribs, filling up the interspaces between them and the 

 sternum; they form the tendinous border above mentioned. The fibres 

 are directed backwards and slightly upwards. The part of the inter- 

 costales which fills up the spaces between the six posterior dorsal 

 ribs appears to belong to the external layer, as the fibres run in the 

 same direction ; in addition there are six separate muscular slips, 

 which pass downwards and forwards from near the free euds of these 

 six ribs, of which the two anterior are iuserted into the fourth sternal 

 rib, and extend for a short distance beneath the external layer, 

 between the fourth and fifth and the fifth and sixth dorsal ribs : the 

 remaining four are lost between the external and internal oblique ; 

 these seem to represent the internal layer, as the direction of the 

 fibres is the same. There is also a muscular layer which appears to 

 be a continuation of the external intercostal ; it arises from the pos- 

 terior border of the tenth dorsal ; and being inserted on one side into 

 the hamular process of the pubis and the edge of the rectus abdo- 

 minis, and on the other into the border of the sacro-lumbalis, it forms 

 an arch over the pubic muscles and fills up the space left vacant by 

 the deficiency of the external oblique in this region. 



Retrahentes costarum are arranged as in Gecko ; the anterior slip 

 arises from the centrum of the first dorsal vertebra, and is inserted 

 into the penultimate cervical rib ; the posterior passes from the 

 tenth dorsal to the eighth rib ; the point of insertion corresponds to 

 that of the internal oblique and transversalis. In this specimen it was 

 much less easily separated into distinct slips than in Gecko, which 

 arose, perhaps, from its being somewhat damaged. 



