4 Watson, Pectoral Girdle from the Loiver Lias. 



is the great narrowness of the posterior part of the 

 coracoid, a condition as different as possible from that 

 which obtains in such genera as Cryptocleidus and its allies. 

 The posterior part of the bone is quite thin and there 

 is no trace of that thickened outer margin which is 

 correlated with the postero-lateral process in such genera 

 as Cryptocleidus and Col}')>ibosaurus. 



Scapulcr,. Neither scapula is quite complete, but the 

 right lacks only a small part of the inner side of the 

 glenoid end, and has the end of the dorsal ramus still 

 covered by matrix. The left scapula has a complete glenoid 

 end, and perfectly supplements the right. The bone has 

 the usual triradiate form. The lower surface is 9 cm. 

 long, and is gently concave from back to front and from 

 side to side. The glenoid end is slightly wider than the 

 anterior end, both being considerably broader than the 

 middle of the bone ; as the exterior edge is sensibly 

 straight, this implies the development of an inward 

 extension passing under the clavicle. 



The dorsal ramus is not exposed for its entire length, 

 but as shewn, is very remarkable for its great breadth, 

 which makes the entire bone very deep at the middle of 

 its length. The dorsal ramus is directed almost exactly 

 dorsally : its inner surface is convex across its breadth, a 

 low, and somewhat obscure, ridge running down it, just 

 behind its centre line. The external face of the scapula 

 is very strongly concave, the outer border is a sharp edge 

 from which the upper surface runs in leaving the bone, 

 very thin until it is met by the thin ridge which is the 

 continuation of the dorsal ramus. 



The clavicular arch lacks a part of the left side and 

 has the right lateral border obscured, but otherwise is 

 excellently shewn. It appears to be quite uncrushed and 



