TURRITELLA (ZARIA) DECIPIBNS. 445 



1870. Turritella acutangula, A. Bell, Journ. de Conch., vol. xviii, p. 350, no. 357. 



1875. Turritella subangulata, var. acutangula, Seguenza, Boll. P. Com. G-eol. Ital., vol. vi, p. 100, 



no. 644. 

 1889. Turritella mediocarinata, de Gregorio, Natur. Sicil., vol. viii, p. 12. 

 1895. Turritella (Zaria) subangulata, var. spirata, Sacco, Moll. Terr. Terz. Piem., pt. xix, p. 10, pi. i, 



fig. 34. 

 1912. Turritella (Zaria) subangulata, var. mediocarinata, Cerulli-Iielli, Palaeont. Ital., vol. xviii, 



p. 160, pi. xxiv, fig. 37. 



Varietal Characters. — Differs from the type in its much finer spiral sculpture and 

 in the more distinct and sub-central angulation of the whorls. 



Dimensions. — L. 45 mm. B. 12 mm. 



Distribution. — Not known living. 



Fossil : Miocene : Vienna basin, Touraine, North Italy. 



Lower Pliocene : Biot, Ligurian coast. 



Upper Pliocene : Asti, Bologna, Livorno, Orciano, Val d'Era, Caltabiano. 



Pleistocene : Monte Pellegrino, San Giovanni, Monteleone, Taranto. 



Remarks. — The shell from the Upper Pliocene of Sicily given under the present 

 name for the purpose of comparison, seems to represent the Turbo acutangulus of 

 Brocchi (T. subangulata, var. acutangula of later writers). 1 



It seems to me that the occurrence of this form in the English Crag is some- 

 what doubtful, the small specimen figured by Wood as T. iucrassata, var. acutangula 

 (Mon. Crag Moll., 2nd Suppl., p. 27, pi. ii, fig. 16) more probably representing the 

 recent Mediterranean species, T. decipiens, described in the next paragraph. 



Turritella (Zaria) decipiens (Monterosato). Plate XLIV, figs. 13, 14. 



1879. Turritella iucrassata, var. acutangula, S. V. Wood, Mon. Crag Moll., 2nd. Suppl., p. 27, pi. ii, 



fig. 16. 

 1878-1917. Turritella decipiens, Monterosato, Enura. e Sinon. Conch, medit., p. 29, 1878 ; Bull. Soc. 



Malac. Ital., vol. vi, p. 226, 1880; T. (Haustator) decipiens, Boll. Soc. Zool. Ital. [3], vol. iv, 1917. 

 1884-98. Turritella decipiens, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss., vol. i, p. 228, 



pi. xxviii, figs. 12-15, 1884; vol. ii, p. 796, 1898. 

 1890. Turritella decipiens, Carus, Prod. Faun. Medit., vol. ii, p. 354. 

 1913. Turritella (Zaria) decipiens, Gignoux, Ann. Univ. Lyon, n.s. [1], vol. xxxvi, p. 550. 



Specific Characters. — Shell small, slender, elongato-conical ; whorls about 10; 

 ornamented by exceedingly fine spiral lines with a prominent, nearly central 

 angulation ; base of the shell concave, acutely angulate ; mouth subquadrangular ; 

 outer lip thin. 



1 Sign. Cerulli-Irelli, following the Marquis de Gregorio, adopts the varietal name mediocarinata 

 for the present form instead of acutangula, as he considers the T. acutangula of Linnc to be a different 

 species. 



