132 



DK. A. SMITH WOODWARD OK YEETEBEATE [May I907, 



Belonostomus (1) carinatus, sp. uov. Scales from Itacaranha, described below 



(p. 133). 

 JUepidotus Mawsoni, A. S. Woodward, Ann. & Mag. Nat. Hist. ser. 6, rol. ii 



(1888) p. 135 ; and Catal. Foss. Fishes Brit. Mus. pfc. iii (1895) p. 120 ; 



figs, of scales by Allport, Quart, Journ. Greol. Soc. toI. xvi (1860) pi. xiv, 



figs. 5-13, pi. xv, figs. 1-4, & pi. xvi, figs. 10-12. 

 Mawsonia gigas, gen. et sp. nor. Described below (p. 134). 

 Acrodus nitidus, A. S. Woodward, Ann. & Mag. Nat. Hist. ser. 6, vol. ii (1888) 



p. 135; and Catal. Foss. Fishes Brit. Mus. pt. i (1889) p. 297 & pi. xiv, 



fig. 8. 



Most of these species have already been described, so far as 

 available material will allow ; but some of Mr. Mawson's fossils 

 need more detailed notice or description before the general relation- 

 ships of the whole vertebrate fauna can be discussed. 



DlNOSAUBIANS. 



The Dinosaurians are still known only by small vertebral centra 

 and a phalangeal bone ; but it is interesting to note that the latter 

 fossil is of the Megalosaurian type, and may belong to the same 

 reptile as the vertebral centrum which was figured by Allport and 

 provisionally determined by Owen as Megalosaurian. Some of the 

 vertebral centra, however, are solid, and seem to agree closely with 

 the corresponding bones of Iguanodonts. 



Ookiopholis Haktti (Marsh). (PI. TI, figs. 1 & 2.) 



The so-called i Crocodilus i Hartti has hitherto been known only 

 by isolated teeth, but is represented in Mr. Mawson's collection 

 by the fine mandibular symphysis from Setubal, shown of one- quarter 

 the natural size in PI. VI, figs. 1 a & 1 b. So far as preserved, this 

 specimen measures 43 centimetres in length, although it consists 

 entirely of the symphysial region of the mandible. It must, there- 

 fore, have belonged to a remarkably-large animal. The symphysis 

 is elongated, narrowband flattened from above downwards with a 

 slightly-spat ulate terminal expansion in front. Its oral surface is 

 raised into a low median longitudinal keel, which disappears at the 

 beginning of the shallow concavity in the anterior terminal expan- 

 sion. The outer surface of the bone is very coarsely sculptured. 

 As shown by the sockets and broken stumps, the total number of 

 teeth on each side within the symphysis is at least seventeen. These 

 are closely implanted in regular series along the wavy edge of the 

 dentary as far forwards as the beginning of the terminal expansion, 

 where the angle is occupied by two relatively large caniniform 

 teeth, and these are followed in front by two rather small teeth. 

 The apex of the crown of one of the caniniform teeth, still in 

 its socket, exhibits the characters assigned by Marsh to Crocodilus 

 Hartti. 



Some fragments of skull display the coarse sculpturing of the 

 external surface ; but the only specimen worthy of special notice is 

 a large dermal scute, which is doubtless referable to the same 

 species. This scute is one of a paired dorsal series, much broader 

 than long, and is shown of one-quarter the natural size in PI. VI, 

 fig. 2. It is imperfect behind, but otherwise well-preserved ; and 



