258 DR. W. 0. RIDEWOOD ON THE 



The dentary, also, is longer and more slender, and carries 64 or 

 65 teeth. The sculpturing of the maxillary and mandibular 

 bones is less obvious than in O. Leichardti. 



The parasphenoid-hyopalatine articulation concerns the ento- 

 pterygoid, not the metapterygoid. The branchiostegal rays in 

 the specimen examined are eight on each side; but A-gassiz 

 (Spix, Pise. Bras,), Giinther (Brit. Mus. Cat. Fishes, vii. p. 378), 

 and Boulenger (Ann. Mag. Nat. Hist. (7) viii. 1901, p. 514) 

 put the number at ten. The third pharyngobranchial is con- 

 siderably stouter than in O. Leichardti. 



OSTEOGLOSSUM FOEMOSUM. 



Seeing that in Osteoglossum Leichardti and O. hicirrhosum the 

 paraspheuoidal pegs articulate with the entopterygoid, whereas 

 Bridge described the articulation as taking place with the meta- 

 pterygoid in O./bnnosum, I was particularly anxious to examine 

 this last species, and Prof. Bridge was good enough to lend me 

 the skull which in 1895 he described in the ' Proceedings of the 

 Zoological Society.' 



The skull is in many respects intermediate between those of 

 O. Leichardti and O. hicirrhosum. The nasal is more sculptured 

 than in the latter, but the size of the nasal relatively to the 

 frontalis more like that of 0.6zCT>*^7iositm than that oW. Leichardti. 

 The prefrontal is ossified. The posterior temporal fossa does 

 not open into the lateral temporal groove. 



The cluster of teeth on tlie parasphenoid is smaller than in 

 O. hicirrhosum, and the two posterior teeth are much larger than 

 the other 10 or 12. The appearance of this cluster is well 

 shown in Bridge's figs. 1, 2, and 4. The ventral surface of the 

 front half of the parasphenoid is grooved. Teeth are present on 

 the vomer. There are 10 or 11 teeth on each preraaxilla, and 

 about 50 ou each maxilla, while each dentary carries about 52 

 teeth. The jaw-bones are longer than those of O. Leichardti, but 

 not so long as thoj^e of O. hicirrhosum. 



The paraspheuoidal articulation is with the entopterygoid, and 

 not the metapterygoid as described by Bridge. On returning 

 to Prof. Bridge the skull which he was good enough to lend 

 me for examination, I pointed this out, and received in reply 

 an admission that he now regarded the articulation as really 

 entopterygoidal. 



The preopercular is intermediate in character between those 



