52 STBATIGEAPHICAL DISTRIBUTION OF THE 



PISCES. 



ELASMOBRANCHEI. 



Selachii. 



Aster acanthus. See Strophodus. 



Hybodus sp. Base of " The Limestone Beds " ^ (zigzag). 

 Bathonian. East-Hill Quarry, Bradford Abbas, near 

 Sher borne, Dorset. 



This tooth broke when an attempt was made to chisel it out. 



Strophodus. General Note. The teeth called Strophodus 

 include two species : one in which the crown is flat (S. 

 magnus Ag.), and the other in which it is considerably 

 elevated, and the tooth itself long and narrow (S. tennis 

 Ag.). Satisfactory figures of these species will be found 

 in the " Catalogue of the Fossil Fishes in the British 

 Museum," pt. i (1889), pi. xv., figs. 2, 3, and 4-8. The 

 teeth which have been named S. reticulatus are now 

 definitely known to belong to Asteracanthus ornatissimus 

 Ag., and are very differently ornamented and keeled. 

 S. magnus Agassiz ( = S. favosus). Teeth. Aalenian, Bajocian 

 and Bathonian. 



RECORDS : Clypeus-Grit or Doulting Beds. *Harford 

 Bridge (near Burton-on-the-Water) ; *Birdlip Hill ; 

 *Slad Valley (near Stroud) ; *Rodborough Hill ; *Sound- 

 borough Farm (near Andoversford) ; Quarry seven- 

 eighths of a mile east of Paulton Church (near Radstock, 

 Somerset) ; *Doulting ; Woolston Quarry, near Blackford, 

 Somerset . 



Upper Trigonia-Grit. * Holwell (near Frome : 

 " Acanthothyris-spinosa-'Bed ") ; *Maes Knoll, Dundry 

 (near Bristol : " Conglomerate -Bed ") ; and Baggerbush- 

 Lane Quarry, Bradford Abbas, near Sherborne, Dorset. 



Notgrove Freestone. *Belas Knap, near Winchcomb, 

 Glos. 



2 Bed B of Mr. Buckman's record, Quart. Journ. Geol. Soc., vol. 

 xlix. (1893), p. 485. 



