Fish-remains from Queensland. 447 



reference, receive the provisional name of C. Sweeti, in honour 

 of their discoverer. Most of the scales of G. lewesiensis, 

 including those of the lateral line, are much deeper than 

 broad, and both these and the scales named G. occidentalis 

 are marked externally with very closely arranged small pits, 

 while the radiating lines on the covered portion are always 

 very conspicuous. The scales of C. Gardneri sometimes 

 exhibit the slight approach to crimping of the hinder margin 

 noted in G. Sweeti, and some of the scales of G. strehlenensis 

 are remarkably smooth. 



Teleostean Vertebras. (PI. X. fig. 7.) 



A chain of five caudal vertebras from the same horizon as 

 the scales described above so closely resemble the corre- 

 sponding bones of G. Gardneri, as shown by a specimen in 

 the British Museum (no. 28901 a), that they quite possibly 

 belong to the same genus. Two are represented of the natural 

 size in PI. X. fig. 7. The inner cone of the centrum 

 appears as a sharply defined rim at each end of the vertebra. 

 The slender neural and haemal arches are not fused with the 

 centrum, but loosely inserted in elongated pits. There are 

 also two very deep pits on each side of the centrum extending 

 almost from end to end. 



Vertebras of this form, however, are also met with in 

 Portheus, Ichthyodectes, and other Cretaceous fishes. There 

 can thus be no certainty in their determination until they are 

 found actually in position in the skeleton. 



EXPLANATION OF PLATE X. 



Fig. 1. Portheus australis, sp. n. Anterior portion of skull, left lateral 

 aspect, two thirds nat. size. — Lower Cretaceous ; Clutba, Queens- 

 land. [Museum of Queensland Geological Survey.] cl, dentary; 

 mx., maxilla; pf., prefrontal; pi., palatine; pr., anterior pro- 

 cess of maxilla ; pt., portion of pterygoid arcade. 



Fig. 1 a. Ditto. Abraded horizontal section of premaxilla of same speci- 

 men, showing four teeth. 



Figs. 2-6. Cladocyclus Sweeti, sp. n. Type scale and four others pro- 

 visionally ascribed to the same species. — Lower Cretaceous, 

 Queensland. [Collection of George Sweet, Esq., F.G.S., Mel- 

 bourne.] 



Fig. 7. Teleostean caudal vertebrae, possibly referable to Cladocyclus 

 Sweeti. — Lower Cretaceous ; Station Creek, Afton Downs. 

 Queensland. [Queensland Museum.] 



[Unless otherwise stated, the figures are of the natural size.] 



