AMERICAN AMPHICCELIAN CROCODILES 5 



sauridge in the narrow acceptation. But Cope mentions no species, 

 and it is now known that certain species referred to Steneosaurus, 

 especially 5. geoffroyi Owen,' do not belong in this genus, ^ or family 

 even, but rather with the Pholidosauridae, possibly Pholidosaurus. 

 The lateral orbits which Cope gives for Hyposaurus is not a teleo- 

 saurid character. S. geojfroyi has elongated nasals, quite different 

 from those of Teleosaurus proper, and it is probable that Hypo- 

 saurus will be found to possess them also, as in Teleorhinus Osborn. 

 It is interesting to observe, however, that Hyposaurus derbianus 

 "sends upward [from the jugals] a postorbital branch, which is 

 external as in other Teleosauridae, and not internal as in the Croco- 

 dilidae" — a strong teleosaurid character that would remove the species 

 from the Pholidosauridae. 



The horizon of H. derbianus is given by Cope as the equivalent 

 of the "Fox Hills," that is of the Fort Pierre,^ and perhaps equiv- 

 alent to the New Jersey deposits. The specimen was from the 

 province of Pernambuco. 



A second genus of longirostrate amphicoelian crocodiles, from 

 an earlier horizon, has been recently described by Osborn^ from the 

 Benton Cretaceous of Montana. Osborn separates the genus from 

 Hyposaurus by the lesser curvature of the propodial bones, but, as 

 I have stated, it is somewhat doubtful whether we actually know the 

 propodials of Hyposaurus sufficiently well to afford this information, 

 if at all; and the author seemed unaware that the longirostrate, if 

 not teleosaurid, character of i7;)'^05aw/'M5 is established. (The bones 

 figured by Leidy do not show the curvature.) He compares the genus 

 with Teleosaurus, to which there seems to be little real relationship, 

 but does not compare it with such forms as "Steneosaurus'' geojfroyi, 

 which has elongated nasals, or with Pholidosaurus (Macrorhynchus), 

 to which it does appear to be allied. Teleosaurus has short nasals 

 and upwardly directed orbits, bordered posteriorly by a rather stout, 

 external rim of bone; Pholidosaurus has lateral orbits, as described 

 by Cope for Hyposaurus and Osborn for Teleorhinus, and nasals 



1 Owen, British Fossil Reptiles, Vol. Ill, p. 144, Plate XVIII. 



2 Koken, Paleontologische Abhandlungen (1887), Vol. Ill, p. 91. 



3 Stanton and Hatcher, Bulletin 257 (1905), United States Geological Survey, p. 66. 

 4 Osborn, Bulletin of the American Museum of Natural History, Vol. XX (1904), 



p. 239. 



