A. Smith Woodward — On the Genus Notidanus. 253 



monly found in the Calciferous-Sandstone Series of Scotland, and the 

 more or less equivalent Carboniferous Limestone of England. Three 

 of them, indeed, — B. sublanata, C. extuberata, and C. attenuata, — have 

 not occurred above the Calciferous Sandstones ; and the other two 

 do not range higher than the lower portion of the Carboniferous- 

 Limestone Series of Scotland; that is, speaking of the Carboniferous 

 rocks only, for it should not be forgotten that ilf. Jonesiana is a 

 Permian species. 



EXPLANATION OF PLATE VII. 

 (The specimens are magnified about 25 diameters.) 



Fig. 1-3. Kirkbya plicata, J. and K. ; la, left valve; lb, view of ventral edge; 



fig. 2, right valve ; fig. 3«, left valve, showing reticulated surface ; 



3b, end view. 

 Fig. 4-8. K. variabilis, sp. nov. ; 4a, carapace, right valve outwards ; 4b, ventral 



view ; 4c, end view ; fig. ba, carapace, right valve outwards ; hb, 



ventral view ; fig. 6, left valve ; fig. la, carapace, left valve outwards ; 



lb, end view ; 8a, carapace, left valve outwards ; 8b, ventral view. 

 Fig. 9-11. Bythocypris ? sublunata, J. and K. ; 9a, carapace, right valve outwards ; 



9b, ventral view; 9c, end view ; fig. 10, interior of left valve ; fig. 11, 



left valve. 

 Fig. 12. Macrocypris Jonesiana ? Kirkby ; right valve. 

 Fig. 13. Cytherella extuberata, J. and K. ; 13«, carapace, right valve outwards; 



13b, left valve; 13c, dorsal view; 13^, end view; 13c, interior of 



right valve. Fig. 13e is from Staneshiel Burn, Roxburghshire. 

 Fig. 14. C. attenuata, J. and K. ; 14«, carapace, left valve outwards ; lib, ventral 



view; 14e, end view. 



III. — On the Paleontology of the Selachian Genus Notidanus, 



CUVIEK. 



By A. Smith "Woodward, F.G.S., 



of the British Museum (Natural History). 



(Continued from page 217.) 



OF the upper dental series, Probst 1 attempts to give a tolerably com- 

 plete account, but it is only illustrated by very imperfect wood- 

 cuts. Two of the foremost awl-shaped teeth are figured by Lawley 

 (I.e. figs. 2, 3), and the same author ascribes to the upper jaw of this 

 species three other of the Pliocene specimens. Fig. 19 represents an 

 anterior upper tooth from the Middle Eocene of Hampshire, and 

 the original of Fig. 20 is another from the Miocene of Baltringen, 

 Wiirtemberg. The former (B. M., p. 4707) exhibits a short thick 

 base with an oblique principal cone, in front of which are a number 

 of minute denticulations ; posteriorly there is only one secondary 

 cone, pointing sharply backwards, and about half the size of the 

 principal cone ; and this is followed by another small denticle. The 

 second specimen (B. M. 35583) has also a short thick root, and shows 

 a somewhat similar crown ; the large principal cone is followed by 

 one small secondary and a terminal denticle, and in front there are 



1 In his first paper (" Ueber das Gebiss des Notidanus primigenius, Ag.," I.e.) : in 

 1879 the author expressed doubts as to the accuracy of his previous work, but it is 

 not improbable that all the specimens at first figured may belong to the species uuder 

 consideration. 



