Vol. 62.] LIASSIC DENTALIIDJi:. 575 



T.l. ' Alderton, Dumbleton, and Stanway Hills [Gloucestershire].' 

 S. ' Lias Marlstone.' [Pliensbachian.j 

 i). [spinati or margaritati, probabh' the former.] 

 Colin. [Not known.] 

 Non 1875. D. angulation, R. Tate, Quart. Journ. Geol. Soc. vol. xxxi, p. 508. 

 Kec 1877. D. angulation, T. Beesley, Proc. Warwickshire Nat. & Arch. F. C. p. 16. 



Protolog. — ' Shell obtusely quadrangular, slightly curved, some- 

 what rugose, with trausverse lines, about 1 j inch in length.' 



Ke marks. — Not one of the proterotypes can be found. I 

 cannot help feeling a little sceptical as to whether the fossil has 

 been correctly diagnosed ; but, supposing that it has been, it is impos- 

 sible to refer to this species, as Iialph Tate has done, the little shell 

 from the striatum-beds. 



Dentalium elongatum, Miinster. (PI. XLY, figs. 17 & 18.) 



T.d. 1841. Miinster (in Goldfuss), ' Petrefacta Germanise ' pt. iii, p. 2. 

 T.f. Ibid., pi. clxvi, fig. 5. 

 T.l. Banz. 

 H. ' E formatione Lias dicta.' [Pliensbachian ?] 



V. ■ 



Colin. 



Dentalium elongatum, Oppel, 1856-58, ' Die Juraformation ' p. 390; Terquem & 

 Piette, 1865, ' Le Liaslnferieur de l'Est de la France ' Mem. Soc. Geol. France, 

 ser. 2, vol. viii, p. 67 : Giebel, 1866, ' Repertorium zu Goldfuss ' Petrefakten 

 Deutschlands ' p. 88 ; Dumortier, 1869, Etudes Paleont. &c.pt. iii, 'Lias Moven,' 

 p. 336; R. Tate, 1870, Quart, Journ. Geol. Soc. vol. xxvi, p. 398; (D. gracile. 

 Moore), R. Tate, 1875 , ibid. vol. xxxi, p. 504 ; R. Tate, 1876, ' The Yorkshire Lias ' 

 p. 332 & pi. ix, fig. 28 ; T. Beesley, 1877, Proc. Geol. Assoc, vol. v, p. 183 ; E. A. 

 Walford, 1879, Proc. Warwickshire Nat. & Arch. F.C. p. 21 (' Fish-bed'); 

 Wrisht, 1879, ' Monogr. Lias Ammonites Brit. Isles ' Pal. Soc. pp. 69, 107 ; 

 Slatter (in Wright) 1882, ibid. p. 375; Richardson, 1904, 'Handbook to the 

 Geology of Cheltenham ' p. 219 & pi. xiv, fig. 7. 



Syn. 1836. Dentalium c'ylindricum, F. A. Rcemer [ non Sowerby], 'Die Ver- 

 steinerungen des Norddeutschen Oolithen-gebirges ' p. 134. 



? 1852. D. filicauda, Quenstedt, ' Handbuch der Petref aktenkunde ' p. 443 & 

 pi. xxxv, fig. 18. 



? 1858. D. filicauda opalina, Quenstedt, ' Der Jura ' p. 328 & pi. xliv, fig. 16. 



1864. D. filicauda, Seebacb, 'Der Haimoversche Jura' p. 131. 



1865. D. elongatum ^filicauda, Brauns, ' Die Stratigraphie & Palaontograpbie 



des siidostlichen Theiles der Hilsmulde, &c.' Pakeontographica, vol. xiii, 



p. 113. 

 1867. D. gracile, Moore, Proc. Somerset Arch. & Nat. Hist. Soc. vol. xiii, 



p. 202 & pi. v, fig. 23 ; see also p. 161. 

 1877. D. gracile, Smitbe, Proc. Cotteswold Nat. F. C. vol. vi, p. 372. 

 1877. D. gracile, Slatter (in Beesley), Proc. Geol. Assoc, vol. v, p. 183. 

 1879. D. gracile (D. elongatum, Miinster), Walford, Proc. Warwickshire Nat. 



& Arch. F. C. p. 18 (acuti hemera). 

 1904. Dentalium sp., Richardson, 'Handbook to the Geology of Cheltenham ' 



p. 219. 



Protolog. — ' Dentalium testa crassiuscula tereti gracili subarcuata 

 laevi. — E montibus Bambergicis. M.M.' 



Remarks. — This common Dentalium has the most extensive 

 range in time of all the Liassic species. From Dentalium etalense it 

 differs mainly in the degree of curvature : D. etalense being regularly 

 curved from end to end, whereas D. elongatum is usually the most 

 strongly curved in the posterior part and nearly straight in the anterior. 

 The smooth Dentalia are very difficult to identify, and matters are 



