428 On vno Phsiosauria from the Oxford Clay. 



the sympliysial region, and of these tlie second to the fifth 

 are very large. Behind the symphysis the first three or four 

 teetli are small, then there are seven or eight larger ones, and 

 behind these there is gradual diminution to the end of the 

 series. The ventral surface of the mandibular rami just 

 where they unite at the symphysis form massive ridges, ter- 

 minating in prominent angles (fig. 4). 



In the tyj)e specimen the twenty cervical vertebrre are for 

 the most part crushed and obscured with matrix; but it can 

 be seen that tlie anterior members of the series are very large. 

 The dorsal vertebrae w'ere about thirty-two in number ; they 

 are greatly crushed and distorted, and have lost the neural 

 arches ; about eighteen crushed caudal vertebrse are preserved. 



The shoulder-girdle (tig. 5), with the exception of the 

 clavicular arch, is fairly well preserved; it is especially 



Fig. 7. 



Imperfect skull and mandible of 8imolesf.es vorax from above. (Type 

 specimen R. 3319.) -rV nat. size, b.oc, basioccipital ; ext.n., ex- 

 ternal nares; md., mandible; mx., maxilla; pmx., premaxillae ; 2>^-t 

 pterygoid ; q-, quadrate. 



remarkable for the extreme thinness of the coracoids, except 

 between their symphysis and the articular surfaces for the 

 humeri. The humeri are fully ossified, the head being 

 rounded and the lateral processes well developed ; the poste- 

 rior borders of the shaft bear strong ridges for the attach- 

 ment of muscles. The radius and ulna are relatively long ; 

 they articulate distally with three bones. 



I 



