300 Dr. C. W. Andrcw3 on some neio Steneosaurs 



iiiaiiy marine crocodiles. The commonest of tliese are species 

 of Metriorhy nchus, but Steneosaurus and Dacosaurus are also 

 represented. In the present paper it is proposed to give a 

 brief account of the species of iSteneosaurus included in the 

 collection. One of these, Steneosaurus edwardsi, has already 

 been described in detail by E. Deslongchamps * from speci- 

 mens from the Oxford Clay of Vaches Noires, Normandy. 

 In addition to this, which need not be further noticed, there 

 appear to be at least four other species, none of which seem 

 to agree at all closely with previously described forms and 

 they will therefore receive new names. 



Steneosaurus. 



This genus is here regarded as it was emended by 

 Deslongchamps and afterwards adopted by Lydekker and 

 others. Lydekker's definition given in the ' Catalogue of 

 Fossil Reptiles in the British Museum,' pt. i. (188S), p. 168, 

 is here followed, all the species described falling within it, 

 with the possible exception of that named S. ohtusidens, 

 which may eventually have to be referred to a new genus. 



Steneosaurus leedsi, sp. n. (PI. VIII. fig. 1.) 



Professor Bigot f has recently described a Steneosaur 

 with a very long and slender snout from the Callovian of 

 Calvados, and for it he has adopted the name Steneosaurus 

 702*.ss?/?', a species originally established by E. Deslongchamps J 

 on the evidence of some small fragments of a mandible from 

 the Oxford Clay of Vaches Noires. Mv. Leeds has pointed 

 out to me that there can be little doubt that the type speci- 

 mens are portions of the jaw of a Metriorhynchus, so that the 

 name is not that of Steneosaur at all. In the Leeds collection 

 is a very fine skull and mandible (R. 3320), the latter closely 

 resembling the one figured by Bigot ; and these specimens I 

 propose to make the types of a species S. leedsi, to which 

 Bigot's specimen no doubt is likewise referable. 



The chief peculiarities of this species are the great length 

 and slenderness of the flattened snout. Thus the length of 

 the skull (from the occipital condyle to the tip of the nose, 

 allowing tor 1 or 2 centimetres broken away) is 81 cm., 

 while that of the pre-orbital region is 59"5 cm., or about 73^ 



* Notes Pal^ontologiques, vol. i. (18G3-69) p. 239, pi. xvii. figs. l-S. 

 t " Notes sur les Reptiles Jurassiques de Normandie," Bull. Soc. 

 g^ol. de Normandie, vol. xvii. (1896) p. 2.3, pi. ii. fig. 1. 

 X Notes Paleontologique?, toI, i. p. 2-52, pi. .\vi. tigs. 3, 4. 



