TURRITELLA TTJRR1S. 443 



Lawrence region. It belongs to the small group of characteristic American 

 mollusca which have been reported from the Pleistocene, but nol from the Pliocene 

 deposits of Great Britain. 



Turritella turris, Basterot. Plate XLIV, figs. 11, 12. 



1825. Turritella turris, Basterot, Mem. Soc Hist, Nat. Paris, vol. ii, p. 29, pi. i, fig. 11. 



1840. Turritella turris, Grateloup, Couch, foss. Terr. Tert. Bass, de l'A<lour, vol. i (Turritella), pi. i, 



fig. 9. 

 1856. Turritella turris, Homes, Foss. Moll. Tert. Wieu, vol. i, p. 423, pi. xliii, figs. 15, 16. 

 1895. Turritella turris and vars., Sacco, Moll. Terr. Terz. Piein., pt. xix, p. 3, pi. i, figs. 1 — 10. 

 1912. Turritella turris, Cossmanu, Ess. Paleocouch. compar., vol. ix, p. 112. 



Specific Characters. — Shell turreted, strong and solid ; whorls about 12, convex, 

 excavated above, angulate below ; spire elongate, slender, regularly tapering ; 

 spirally ornamented by 5 or 6 unequal ridges, the two lower ones being the most 

 prominent, and by exceedingly fine strise ; suture deep and channelled ; base of the 

 whorls subangulated by the last ridge ; base of the shell rounded and obscurely 

 ridged. 



Dimensions. — L. 45 mm. B. 12 mm. 



Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. 



Miocene : Touraine, Bordeaux, Vienna, Piedmont. 



Remarks. — The worn specimen from Oakley figured under this name corre- 

 sponds more or less closely with Basterot's original figure of the present species, 

 and with a fossil from the Faluns of Touraine that I have received as T. turris. It 

 may possibly be derivative in the English Crag, where broken fragments of it 

 are occasionally met with. T. turris is a characteristic Miocene shell which, so 

 far as I know, has not been reported hitherto from the Pliocene deposits. The 

 Crag specimen I have figured under this name may be regarded as a somewhat 

 doubtful identification. The Miocene fossil given for comparison is from the 

 Faluns of Touraine. 



Sub-genii* ZARIA, Gray, 1847. 

 Turritella (Zaria) subangulata (Brocchi). Plate XLII, figs. 15, 16. 



1814. Turbo subangulatus, Brocchi, Conch, foss. subap., vol. ii, p. 374, pi. vi, fig. 16. 



1871. Turritella subangulata, Jeffreys in Prestwich, Quart. Journ. Geol. Soc, vol. xxvii, p. 492. 



1873-5 Turritella subangulata, Seguenza, Boll. R. Com. Geol. Ital., vol. iv, p. 356, no. 336, 1873; 



vol. v, p. 282, no. 122, 1874 ; vol. vi, p. 100, no. 644, 1875. 

 1878. Turritella subangulata, de Stefaiii e Pautauelli, Bull. Soc Malac Ital., vol. iv, p. 148. 



