310 MYOLOGY OF CHLAMYDOSAURUS KINGII, 



Interossei. 1st, Flexor brevis. — Large, fanlike ; — rising from the 

 carpus and going in pairs of fascicles to each side of the three 

 middle digits. 2nd. A similar pair of very feeble insertions into 

 the fifth, digit. 3rd. Opponens pollicis, a single fascicle from the 

 ulnar side of the index to the ulnar side of the pollex. 4th. 

 Fhxoi brevis pollicis — A fascicle with direct course from the carpus 

 to the ulnar side of the pollex. 



Interossei dorsales. — From the carpus to each side of each digit 

 save the pollex. The fascicle mentioned by Mr. Mivart as inserted 

 into the metacarpal of the pollex appears to be substituted by the 

 extensor proprius pollicis. 



Muscles of the pelvis and hind limb 



Sartor-gracilis (fig. 5 — s. g.) — The broad and thin muscle 

 traversing the inner (ventral) side of the lacertian thigh obliquely 

 and superficially, occupying the place and performing the functions 

 of the sartorius and gracilis has been named both the one and the 

 other. In the present subject at least, it seems to me to be a 

 combination of the two and to deserve the compound name. It 

 rises from the ischium, and the arched ligament connecting the 

 ischium with the spine of the pubis. It has no origin from 

 the ischiatic symphysis. Its tendon is inserted into the ridge 

 on the back of the tibial side of the tibia, at the lower end of 

 the internal lateral ligament where it covers the tendon of 

 the semitendinosus whose insertion is in union with it. The 

 sartorius is represented by the upper and major part of the muscle, 

 the gracilis by the inferior fibres which about the middle of their 

 length separate from the rest, and send a slender tendon to be 

 inserted just below that of. the chief division, distinct from it, but 

 communicating with it by a minute belly and delicate tendon. 



Semitendinosus (fig. 5 — s. t.) — From the ligament joining the 

 posterior point of the ilium with the tuberosity of the ischium, in 

 close proximity to the origin of the biceps ; — inserted as the deep 

 part of the sartor — gracilis tendon. 



