MACKTE — ON A NEW SPECIES OF HYBODUS. 



245 



straight and conical as that primitive type itself. Perhaps, however, 

 this is but a fanciful idea, and time will not now allow us to work it 

 out. 



The species given by Professor Morris are — 



From the Chalk (error, should be Wealden, s. .t. m.) — //. sulcatus ; species, chalk, 

 Northdect (WethereU Coll.), Norfolk (Rose Coll.) ; Lower Greensand (? Wealden, s. j. m.), 

 — H. basanus ; Wealden, — II. subcarinatus ; Portland, — II. strictus ; Kimmeridge 

 Clay, — If. acutus, II. Icptodus ; Common to both Great Oolite and Wealden, — II, dubius, 

 II. dursalis (Hastings), II. marginalis, II. strialuhis ; Great Oolite, — apica/is, II. 

 grossoconus, II. Lawsoui, H. obtusus, II. polyprion, H. undulatus ; Inferior Oolite, — 

 II crassus ; Lias, — II. carinatus, H. crassiformis, H. curtus, II. Delabechei, H. 

 ensatus, H. formosus, II. medius, H. pyramidulis, II. raricostatus, H. reticulalus ; 

 Trias? (Lias Bone bed, s. j. M.) 3 — II. Icevinoculus, H. plicatilis, H. minor; from the 

 Keuper of Worcestershire, — II. Iceuperianus. 



The following are the specimens of Hybodus in the British 

 Museum : — Back tooth of Hybodus polyprion, Agassiz, from "Wealden 

 of Tilgate Forest (Mantell Coll.) ; back tooth of Hylodus (? sp.) 

 from Wealden of Sussex (Dixon Coll.) ; several front teeth of Hy- 

 lodus (? sp.) from Wealden, Tilgate Forest (Mantell Coll.) ; front 

 teeth of Hybodus grossiconus, Agassiz ; Wealden, Tilgate Forest 

 (Dixon Coll.) ; others of same species, no locality given, but name of 

 "P. Doran" attached to label; two others of same species from 

 Forest Marble of Atford, collected by Mr. Wood ; some from the 

 Forest Marble of Stanton, presented by W. Cunnington, Esq. ; one 

 from the Forest Marble of Malmesbury, collected by Mr. Buy; one 

 seemingly of the same species from the Great Oolite of Stonesfield ; 

 several from the Forest Marble of Wiltshire (W. Cunnington, Esq.) ; 

 two from Stonesfield Slate of Oxfordshire (Mantell Coll.), several from 

 the Stonesfield Slate of Eyeford, collected by Mr. Binfield. Back 

 teeth of Hybodus polyprion. from the Stonesfield Slate of Eyeford 

 (Mr. Binfield) ; one from Great Oolite of Stonesfield, presented by 

 S. P. Pratt, Esq. ; one also apparently of the same species from the 

 Great Oolite of the same locality ; two from the Stonesfield Slate of 

 Oxfordshire (Mantell Coll.) ; three anterior side-(?) teeth, seemingly of 

 this species, from the same formation and district ; a posterior (?) side- 

 tooth from Great Oolite of Stonesfield; four largish teeth of a Hy- 

 bodus, apparently IT. polyprion, from the Great Oolite of Malton 

 (Bean Collection). Two back teeth of Hybodus reticulatus, Agassi/., 

 from the Lias of Lyme Regis; six of Hybodus pyramidalis, Agassiz, 

 Lias, Lyme Begis ; a very fine mass of jaw, and numerous teeth of 

 Hybodus reticulatus, Lias, Lyme Begis; slab with numerous large 

 and fine teeth of a species of Hybodus, Lias, Lyme Regis; very 

 fine congeries of back teeth of a ffyhodw, seemingly the same 



