Vol. 6$.^ CRETACEOUS FOSSILS PROM BAHIA. 133 



its narrow overlapped anterior border is interesting, as being pro- 

 duced into a large forwardly-directed peg near its outer end, for 

 firm articulation with the scute next in front. Its outer exposed 

 face is marked in front with large and deep pittings, which are 

 irregular in size and shape. 



The new fossils thus seem to determine the systematic position 

 of the large extinct Bahia crocodile. It cannot belong either 

 to the Teleosaurian Hyposaurus or to the Procoelian Thoracosaurus, 

 with which the teeth have been compared, because the scute 

 exhibits a peg-and- socket articulation. This structure has hitherto 

 been noticed only in the Wealden and Purbeckian marsh-crocodiles 

 of the family Goniopholidae. 1 The teeth and their arrangement 

 in the front half of the mandible resemble those of Goniopholis 

 itself ; and the new mandibular symphysis now described is only 

 longer than is usual in Goniopholis. It is, therefore, reasonable to 

 conclude that the Bahia specimen is not only one of the Goniopho- 

 lidse, but probably referable to the type-genus of the family. It 

 may be added that the only portions of associated vertebral centra 

 that might be crocodilian, are of an amphicoelian, not procoelian, 

 type. 



Pterosauria^. 



Since the quadrate bones of a pterodactyl from Pedra-Furada 

 Bay were described, Mr. Mawson has found a typical pterosaurian 

 tooth in the same locality. 



Belonostomtjs (?) carinattjs, sp. nov. (PI. YI, figs. 4 & 5.) 



Some rhombic ganoid scales, found naturally associated in a 

 group near Itacaranha, represent a hitherto unknown fish, and 

 exhibit, in an exaggerated form, a type of ornamentation which is 

 only known among ganoids in the Cretaceous species of Belono- 

 stomus. 2 If, however, the scales belong to this genus, they are 

 referable to the hinder part of the caudal region, and are thus not 

 very satisfactory for specific determination. The smaller scales, 

 shown in a fractured state, of the natural size, in Pi. YI, fig. 4, 

 bear a sharp, simple keel, which arises near the middle of the 

 exposed face and extends downward and backward into a promin- 

 ent spine at the postero-inferior angle. The remainder of the 

 exposed face is smooth, or only marked by very feeble wrinkles, 

 which tend to range in horizontal lines near the smooth posterior 

 border. The upper border of each scale is strongly sinuous, and its 

 antero-superior angle is produced upwards. The few scales shown 

 in PI. YI, fig. 4, increase both in size and in relative depth upwards,, 

 and therefore doubtless belong to the ventral region of the flank. 



1 [Since the reading of this paper, Mr. A. N. Leeds, F.G.S.,has submitted to 

 rne the dorsal scute of Steneosmirus shown in PI. VI, fig. 3, proving that, in 

 this Teleosaurian genus, the dorsal armour was made rigid by the peg-and- 

 socket articulation.— A. S. W., February 13th, 190? '.] 



2 Compare the scales of Belonostomus Sweeti, R. Etheridge, jun., & A. S- 

 Woodward, Trans. Eoy. Soc. Victoria, vol. ii, pt. ii (1891) pi. i, figs. 6 & 7. 



