230 Baron F. von Ilucnc on Phytosaurian Eemains. 



stronger curvature to one side, whicli must be tlie ulnar one. 

 1'he section at the proximal end is oval. 



mm. 



Preserved length 130 



Probable length 135 



Diameters at proximal end 25/15 



Diameter in the middle 12 



Diameters at distal end 30/17 



Metacarpal. — A little flat bone (fig. 7) in the Bristol Mu- 

 seum (no. 102) is probably a metacarpal bone. It resembles 

 a little the metacarpal of Rhytidodon figured by McGregor 

 (Mem. Amer. Mus. Nat. Hist. ix. 1906, pi. ix. tig. 27). 



mm. 



Lenjrth 56 



Diameters of proximal end 30/12 



distal end 19/11 



„ in the middle 8/17 



The bones of Rileya j)lalyodon indicate an animal of great 

 size. It might be as large as My stria suchus^ Belodon, and 

 Rhytidodon ; it is even larger than Steganolepis. The 

 anterior leg is much more slender than in Steganolepis, about 

 as much as in Rhytidodon, o^^ly the metacarpals seem to 

 be more enlarged at both extremities. The luemapophyses 

 have two articular faces, as in Rhytidodon. 



The teeth of " Falwosauriis " stricklandi, Davis (Quart. 

 Journ. Geol. Soc. xxxvii. 188J, pi. xxii. fig. 6), from the 

 RhastiC;, which are very similar to those here described, also 

 of course belong to a Phytosaur. 



EXPLANATION OF PLATE VI. 



Fiff. 1. Tooth of Rileya plafi/ocJor),Tl\\ey and Stutchbury sp., about uat. 



size (specimen in the British Museum), a, side view ; b, front 



view ; c, transverse section ; d, enlargement of the serration. 

 Fiff. 2. Two caudal vertebrae (in the Yale University Museum, New 



Haven, Conn.), ^ nat. size. Each shows one praezygapophysis. 

 Fig.S. Back view of proximal haemapophysis (in the Bristol Museum, 



no. 30), ^ nat. size. 

 Fiff. 4. Back view of right humerus (in the British Museum), ^ nat. size. 

 Fiff. 5. Back view of right humerus (in the Bristol Museum, no. 95), 



I nat. size. 

 Fiff. 6. Kadius (in the Bristol Museum, no. 52), | nat. size, a, whole 



view ; b, distal end from opposite side ; c, distal end from right 



side of fig. a ; d, section at proximal end ; e, section in the 



middle ; /, section at distal end (the flat side of it is upper side 



in tig. a). 

 Ftfjs. 7 a, 7 b. Metacarpal (in the Bristol Museum, no. 102), \ nat. size. 



Two views ot the same. 



