158 



MAEINE EEPTILES OF THE OXEOED CLAT. 



scapulae and coracoids meeting in a long continuous median symphysis. The structure 

 of the clavicular arch in this genus distinguishes it from its contemporaries, in that 

 both the clavicles {cl.) and the interclavicle {i.cl.) are well developed. The inter- 

 clavicle is a transversely elongated oval bone, the outer convex borders of which are 

 produced into a number of irregular projections ; the anterior border is slightly 

 concave in the middle line, the posterior nearly straight. The peripheral portions of 

 the bone are thin, but in the middle line, especially at about the junction of the 



Text-fiff. 76. 



Let. cL 



Shoulder-girdle of Triclddus seeleyi, from above. (Type specimen, E. 3539, i nat. size.) 

 cl., clavicles ; cor., coracoid ; i.cl., interclavicle ; sc, scapula ; v.sc, ventral ramus of scapula. 



middle and anterior thirds of the bone, there is a considerable thickening, which 

 appears on the inner (visceral) surface as a slight longitudinal elevation, on either side 

 of the posterior portion of w^hich the surface is gently concave. These concavities are 

 bounded anteriorly by a transverse ridge, against which the inner ends of the clavicles 

 {cl.) fit. The ventral face of the interclavicle is gently convex and its surface is 

 slightly pitted and roughened, especially towards the periphery, where the bone seems 



