398 Mr. A. S. Woodward on some 



EXPLANATION OF PLATE XYII. 



Fig. 1. Dictyopyge {?) Draperi, sp. n. ; fisli wanting caudal fin. — Storm- 

 berg Beds, Iiouxville, Orano-e Free State. 



Fig. 2. Atherstonia minor, sp. n. ; middle portion of trunk. — Beaufort 

 Beds, Klip Fontein, S.W. of Fraserburg, Nieuwveldt Range, 

 Cape Colony. 



Fi(/. 2 a. Ditto ; scales, four times nat. size. 



Fiff. 3. Atherstotiia Seeleyi, sp. n. ; portion of trunk -witli pelvic and anal 

 fins. — Ibid. 



Fig. 3 a. Ditto ; natural impression of scales, four times nat. size. 



Fig. 4. Undetermined Paleeoniscid fish ; caudal region. — Molteno Beds, 

 Biggarsberg, Natal. 



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



LVIIl. — On some ' British Upper -Jurassic Fisli-remains, of 

 the Genera Caturus, Gyrodus, and Notidanus. Bj A. 

 Smith Woodward, F.L.S. 



[Plate XVIII.] 



There are still numerous British fossil fish-remains, named 

 or brieflj noticed by Agassiz, awaiting some definite descrip- 

 tion ; and the first two of the following notes relate to Upper- 

 Jurassic species unsatisfactorily treated in the ' Poissons 

 Fossiles.' The third note refers to a very rare form of 

 {Selachian tooth from the Oxford Clay ; and each of tiie species 

 described is as yet known from such imperfect materials, that 

 the brief review of the subject below may call attention to 

 the deficiency and lead to the discovery of other specimens. 



1. Caturus angustusj Agassiz. (PL XVIII. fig. 1.) 



1844. Caturus angustus, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. p. 118. 



Among the numerous species of Upper-Jurassic fishes 

 noticed by x\gassiz under names with inadequate description 

 is a form of Caturus from the Portland Oolite of Garsington 

 Hill, near Oxford. It is named Caturus angustus, and dis- 

 missed with the brief diagnosis : — " Esp^ce tres-allongee, 

 remarquable par le developpement excessif des fulcres du 

 lobe superieur de la caudale. Du portlandien de Garsington 

 pres d'Oxford." ISo information is afforded as to the owner 

 of the original specimen or the museum in which it was pre- 

 served ; and it is thus perhaps a matter of speculation to 

 identify the actual fossil on wliich the notice is based. So 



