Mr. R. Tate on a new Oenus o/* CeritliiadEe. 419 



Turritella^ and that these small shells are not correctly refer- 

 able either to Gerithium or to Turritella. The same characters 

 are exhibited by C. imdulatum^ Quenstedt, which is referred 

 by the same authors, with some doubt, to Turritella ; they 

 remark, further, that many allied species occur in several 

 formations, such as the Inferior Oolite, Great Oolite, and 

 Oxford Clay. Three of these allied species have been de- 

 scribed by E. Eudes-Deslongchamps (1842) under Geritkimn^ 

 but grouped together with the common characters : " Anfrac- 

 tihus concavisj ad suturas elatis, testa mwicata, canali suh- 

 nullo.''^ 



The species which I refer to the genus agree in the follow- 

 ing characters : — Test turriculate or subulate, ornamentation 

 as described in G. tortilis ; no anterior canal ; peristome entire 

 and broadly reflected on the columella; the posterior canal 

 has been noticed in G. tortilis and G. contorta^ but its presence 

 in the other species is not known, they not having been exa- 

 mined, excepting a specimen of G. scobina, in which the aper- 

 ture is not exposed. In G. tortilis the shell is porcellaneous, 

 smooth, and shining. 



Species of Gryptaulax : — 



1. G. tortilis^, Hebert & Deslongchamps {Gerttlmim), loc. 



cit. Oxford Clay, inferior : Montreuil Bellay (Maine-et- 

 Loire) {Hebert & Deslong.) ; Hutka, Poland [Zeuschner. 

 Coll. Geol. Soc). 



2. G. undulata'^, Quenstedt, sp. {Gerithiwn), Der Jura, t. Q5. 



f. 24, p. 488 (1858). Turritella imdidata, H^b. & 

 Deslong. loc. cit. t. 7. f. 13. Oxford Clay, inferior : Mon- 

 treuil Bellay {II. & D.) ; Wlirtemberg {^Quenstedt). 



3. G. contm-ta^ Deslongchamps [Gerithium) ^ Mdm. Soc. Linn. 



de Normandie, vol. vii. p. 194, t. 10. f. 44^46 (1844). 

 Inferior Oolite : Les Moutiers ; Sully, Bayeux {Deslong., 

 Tesson, Tate). 



4. C. hystrix, Deslong. [Geritliiuni) loc. cit. (1844) t. 10. 



f. 47,48, p. 195. Inferior Oolite : Les Moutiers {Deslong.). 



5. G. scobina, Deslong. {Gerithium) loc. cit. (1844) t. 10. 



f. 49, 50, p. 196. Gerithium varicosum, Moore, Upper 

 and Middle Lias, West of England (1867), t. 4. f. 15, 

 p. 83. Upper Lias : Fontaine Etoupefour {Deslong.)-, 

 Ilminster {Moore). Upper Lias Sands, upper zone : 

 Nailsworth ! {Lycett). 



* The removal of these two species from Cerithium will obviate a 

 change in the nomenclature, as the specific names are already preoc- 

 cupied for species of that genus. 



30* 



