444 Mr. A. S. Woodward on some 



LVI. — On some Fish-remains , of the Genera Portheus and 

 Cladocyclus, from the Rolling Downs Formation {Lower 

 Cretaceous) of Queensland. By A. Smith Woodward, 

 F.L.S. 



[Plate X.] 



Through the kindness of Mr. R. L. Jack, Government 

 Geologist of Queensland, and Mr. George Sweet, of Bruns- 

 wick, Melbourne, the writer has been favoured with the 

 opportunity of examining some further remains of fishes from 

 the Lower Cretaceous of Queensland. With the exception 

 of a few Selachian teeth and vertebrae * and a fine species of 

 JBelonostomus j" no cretaceous ichthyolites of importance have 

 hitherto been described from this Colony; and the discovery 

 of the two additional species now to be placed on record is 

 thus one of considerable interest. The genera represented 

 have been found in the Cretaceous both of Europe and 

 America, and the second, like Belonostomus, also occurs in 

 Brazil. The species, however, appear to be distinct from 

 any already described, and sufficiently characteristic portions 

 of the first are preserved to admit of a precise diagnosis. 



Portheus australis, sp. n. (PL X. figs. 1, 1 a.) 



Type. — Anterior two thirds of the jaws with part of the 

 base of the cranium exposed on both sides, but more or less 

 abraded and fractured ; Museum of Queensland Geological 

 Survey. 



Sp. Chars. — A species of medium size, about two thirds as 

 large as the type species. Premaxilla with four relatively 

 large closely arranged teeth. Maxilla not much deepened in 

 front, the dentigerous border nearly straight, the teeth well 

 spaced and those anteriorly not much enlarged. 



Description. — The left side of the type and only known 

 specimen is shown of two thirds the natural size in PI. X. 

 fig. 1, and an abraded horizontal section of the right pre- 

 maxilla, with the four teeth, is given in fig. 1 a. There is 

 nothing worthy of remark in the fragmentary cranium, and 

 the comparatively delicate, toothless, pterygoid arcade (pt.) 

 is only imperfectly shown. The robuster portion of the 

 palatine {pl.) } however, interposed between the maxilla 



* Lamna appendiculata and L. Daviesi, R. Etlieridge, Jun., Proc. Linn. 

 Soc.N. S. Wales, [2] vol. iii. (1888) p. 156, pi. iv. 



1" JBelonostomus Siveeti, R. Etlieridge, Jun., and A. S. Woodward, 

 Trans. Eoy. Soc. Victoria, 1891, p. 1, pi. i. 



