No. 2.] SCAPULAR AND PELVIC ARCHES. 229 



Posterior limb. This is an undivided, short rod of cartilage, 

 which is loosely articulated to the posterior concavity of the 

 pelvic element, thus marking the position of the acetabulum. 



Observations. Miiller {I.e., 227) erroneously states that the 

 sternum is wanting in this genus. The figure of the scapular 

 arch given by Dumeril and Bibron is very defective in propor- 

 tions. The posterior limb rudiment is not shown in the pelvic 

 arch. This is figured by Schufeldt, but he omits the interclavicle 

 from the scapular arch, as he does also from that of Gerrhonotus 

 multicarinattis {I.e., Figs. 4 and 5). The pelvic elements and limb 

 are well figured by Miiller {I.e., PI. XIX, Fig. 3). Fiirbringer's 

 description is good, but he overlooks the rudimental femur. 



PsEUDOPUS APUS Pallas. Not examined by me, but described 

 by Heusinger, Miiller {I.e., PI. XIX, Fig. 2), and Dumeril and 

 Bibron, and Fiirbringer. These authors represent the scapular 

 arch as being closely similar to that of Ophisaurus. The pelvic 

 arch differs in the slightly greater development of the hind 

 limb, which besides being minute has a still more minute 

 tibia. 



DopAsiA GRACILIS Gray. PI. XIII, Fig. 5. From the Him- 

 alayas. Not previously studied. Scapular and pelvic arches 

 present, no limbs. 



Scapular areh. Interclavicle wanting ; clavicles present, osse- 

 ous, meeting medially. Scapula cartilaginous ; coracoid osseous. 

 A large coracoid cartilage, which is continued proximally into 

 the short and narrow procoracoid cartilage. Sternum without 

 rib connections, of a transversely crescentic form, the con- 

 vexity anterior, with some ossific deposit at the middle, on each 

 side of the median line. 



Pelvic arch. The three elements fused into a single piece, of 

 which the ilium forms a slender proximal part, and the distal 

 elements an oval plate, concave anteriorly, and convex poste- 

 riorly ; the whole entirely lateral in position, and having a 

 general resemblance to the corresponding parts of Ophisaurus. 

 Ilium short, its proximal extremity in contact with a very robust 

 diapophysis of a single vertebra. 



Observations. The absence of the interclavicle justifies the 

 retention of the genus Dopasia Gray, as distinct from Ophi- 

 saurus. I have examined two skeletons of the D. gracilis, and 

 a half dozen of those of O. ventralis. 



