PLATE II. 



Fig. Page 



1. Ophthalmosaurus icenicus, Seeley ; skull from above ; the basioccipital is 



drawn from a second specimen : one-fonrth nat. size. [R. 3702.] 4 



2, 2 a. Ditto; left prefrontal from above (2) and from below (2 a): one-third 



nat. size. [Leeds Coll.] 28 



3, 3 a. Ditto ; postorbital, from outer side (3) and from inner side (3 a) : one- 



third nat. size. [Leeds Coll.] 21 



4. Ditto ; left fore paddle from above : one-fourth nat. size. [R. 3702.] 49 



These specimens were received after the descriptions were written, and therefore 

 are not specially referred to in the text. 



cu-i., articular bone. 

 b.oc, basioccipital. 

 /)•., frontal. 



h., humerus. 

 int., intermedium. 



y.Jugal. 

 j.s., surface for jugal. 



I., lachrymal. 

 I.S., surface for lachrymal. 

 mx\, maxilla. 



?^., nasal. 

 na7\, external nares. 

 U.S., surface overlapped by nasal. 



j3., pisiform. 

 2:)ar,, parietal. 

 p.for., pineal foramen. 

 p.mx., premaxillae. 

 po.f., postfrontal. 

 jjo./.s., surface for postfrontal. 

 j)r./., prefrontal, 

 g., quadrate. 

 r., radius. 

 rad., radiale. 

 St., stapes. 



u., lilna. ' 



ulii., ulnare. 



