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The snout of the Steneosaurus varies much in length ; some 

 are very long, others relatively short, becoming, in every case, 

 more and more flattened as it approaches the frontal region. 

 The alveolar borders are straight, and the orbits, unlike Teleo- 

 saurus, have, more or less, an oblique direction. M. E. Des- 

 longchamps, in his exhaustive memoir on the Teleosaurians of 

 Calvados, describes eight species of Steneosaurus, in a compari- 

 son of which with our Cornbrash fossil, J. W. Hulke, Esq., 

 F.R.S. (who has devoted much time to the study of the com- 

 parative anatomy of the Saurian family), says : " The up- 

 ward direction of the orbits and small size of the prefrontals 

 (P.P.) place this fossil in the same division as Steneosaurus 

 Boutilieri (which M. Deslongchamps regards as the mature 

 form of Steneosaurus Oxoniensis), Steneosaurus Larteti, and 

 Steneosaurus megistorhynchus ; and they separate it from the 

 Teleosaurians with stouter snouts and with larger prefrontals 

 (P.F.), and lachrymals (L.) overhanging the front and upper 

 borders of the more obliquely laterally-directed orbits. From 

 Steneosaurus Oxoniensis, Boutilieri, and Larteti this fossil 

 differs in the less attenuated front end of the principal frontal. 

 The orbit of this fossil has a straighter outer, and a more 

 curved inner, border than in Steneosaurus Larteti, in which 

 respects it resembles Steneosaurus megistorhynchus ; but the 

 relative proportions of the orbits and temporal fossee resemble 

 more those of Steneosaurus Larteti. The temporal fossae, how- 

 ever, are wider than those of the last species, with the same 

 length (18 centimetres), and nearly their width in front ; in 

 Steneosaurus Larteti it is 7 centimetres, and in this fossil 8 

 centimetres, and behind, 9 and 1 1 centimetres. The maximum 

 breadth of the principal frontal (F.), taken at the distance be- 

 tween its articulation with the two prefrontals (P.P.), is greater 

 than in either Steneosaurus Larteti or Steneosaurus megisto- 

 rhyncus. I am unable to refer this Steneosaurus to any already 

 described species, and propose to specifically distinguish it by 

 the name of its fortunate discoverer, Mr. Darell Stephens 

 "Steneosaurus Stephani 



