VERTEBRATA. I 5 69 



* Incertcz sedis. — Remains of a fish from the Oxford Clay of Peter- 

 borough have been described as Leedsichthys, 1 which apparently 

 indicates the largest Jurassic representative of the class, although its 

 serial position cannot yet be determined. A bone which is regarded 

 as the frontal has a length of 24 inches, while the squamous hyo- 

 mandibular is at least 1 5 inches long. The most remarkable fea- 

 tures of this fish are, however, shown in the pectoral fin-rays, which 

 sometimes attain a length of 5 feet, and frequently branch in a 

 forked manner, but are not jointed. Each ray consists of fibrous 

 bone, and appears to be composed of a number of long and taper- 

 ing splints which are incompletely fused together, and the two 

 halves of the ray remain separate. 



Reptilia. 



Anomodontia. — The author's recent study of the Anomodont 

 remains in the British Museum has enabled him to make some 

 amendments on the characters of the families and genera given in 

 the text. 



In Tapinocephalus (pp. 1057-58) the dentition, although it may 

 have been of a carnivorous type, was not differentiated into incisives, 

 tusks, and cheek-teeth ; and it is highly probable that there were no 

 secondary nares. It does not appear by any means certain that the 

 one tooth on which the genus Glaridodon (p. 1061) is founded, 

 is really distinct from Titanosuchus (p. 1058). 



In the Galesauridce (pp. 1058-59) the single narial aperture of the 

 type specimen of sElurosaurus is due to imperfection ; and it is 

 probable that the same is the case with Cynodraco, Cynochampsa, 

 and Cynosuchusr- The latter has 7 or 8 cheek-teeth, with a poste- 

 rior basal cusp, but the incisive and cheek-teeth appear to have no 

 serrations on the posterior edge. Cynochampsa was probably allied, 



having - incisive teeth as in Cynosuchus. In Cynodraco and the 

 3 



type of Ailurosaurus there are — incisive teeth ; and the crowns of 



4 

 the incisive and cheek-teeth have serrated posterior edges ; and it has 

 yet to be proved that Alhirosaurus is generically distinct from Cyno- 

 draco. In Tigrisuchus there are three pairs of upper incisive teeth. 

 Gorgonops (p. 1059) differs from the GalesauridcB in having the 

 temporal fossae roofed over, and apparently in the absence of second- 



1 The practice of making such barbarous compounds as Leedsichthys, Ozvenia- 

 suchus (p. 1 191), and Wardichthys (p. 979), is much to be deprecated. If a change 

 be permissible, the terms Leedsia and Wardia may be suggested in place of the 

 first and third of these uncouth names. 



2 By an error (see Corrigenda) these three genera are stated to have double 

 nares, while in Tigrisuchus the nares are said to be single. 



