Mr. E,. Tate on a new Genus o/" Cerithiadaj. 419 



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

 able either to Cerlthium or to Tarritella. The same characters 

 arc exhibited by C. undidatiinij Quenstedt, which is referred 

 by the same auth(M-s, with some doubt, to Turritclla ; they 

 remark, farther, 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 Centhtum, 

 but grouped together with the common characters : " Anfrac- 

 tihus concavisj ad siituras elatisj testa mitn'cataj canali suh- 

 nulJoy 



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

 ing characters : — Test turriculate or subulate, ornamentation 

 as described in C. tortiUs ; no anterior canal ; peristome entire 

 and broadly reflected on the columella ; the posterior canal 

 has been noticed in C. tortUis and C. conforta, but its presence 

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

 mined, excepting a specimen of C. scohina, in which the aper- 

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

 smooth, and shining. 



Species of Cryptaulax : — 



1. C. tortilis*, Hebert & Deslongchamps (Cerithitim), he. 



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

 Loire) {Hehert & Deslnng.) ; Hutka, Poland (Zeuschner^ 

 Coll. Geol. Soc). 



2. G. unduJata*j Quenstedt, sp. (Cerithium), Der Jura, t. 65. 



f. 24, p. 488 (1858). Tarritella undulata, Hdb. & 

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

 treuil Bellay {H.djD.) ; Wlirtemberg {Quenstedt). 



3. C. contortaj Deslongchamps [Cerithiinn), ^I6m. Soc. Linn. 



de Xormandie, vol. vii. p. 194, t. 10. f. 44-46 (1844). 

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

 2^esso7ij Tate). 



4. C. hi/strix, Deslong. {Cerithium) loc. cit. (1844) t. 10. 



f. 47,48, p. 195. Inferior Oolite : Les Moutiers (Z>e5/o?j^.). 



5. C. scobina, Deslong. {Cerithium) loc. cit. (1844) t. 10. 



f. 49, 50, p. 19G. Cerithium 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, a3 the specific names are already preoc- 

 cupied for species of that genus. 



30* 



