4"»4 PLIOCENE MOLLUSCA. 



some doubt, as the T. marginalia of Brocchi and of Homes, agreeing with the 

 T. planispira of Nyst's work of 1843 (op. cit.), but not with the Scaldisien fossil 

 figured by him in 188] as T. incrassata, var. planispira, which is, I consider, a 

 different species. 1 



Turritella (Haustator) imbricataria (Lamarck). Plate XLIII, figs. 12—11. 



1804. Turritella imbricataria, Lamarck, Ann. du Mus., vol. iv, p. 216, pi. xxxvii, fig. 7. 



1812. Turritella conoidea, Sowerby, Min. Conch., vol. i, p. 109, pi. li, fig. 5. 



1824. Turritella imbricataria and vars., Deshayes, Desc. Coq. foss. Env. de Paris, vol. ii, p. 271, 

 pi. xxxv, figs. 1, 2 ; pi. xxxvi, figs. 7, 8 ; pi. xxxvii, figs. 9, 10. 



1842-48. Turritella conoidea, S. V. Wood, Ann. Mag. Nat. Hist. [1], vol. ix, p. 534, 1842 ; T. imbri- 

 cataria, Mon. Crag Moll., pt, i, p. 75, pi. ix, fig. 10, 1848. 



1843. Turritella imbricataria, Philippi, Beitr. Kennt. Tert. Dentsch., pp. 56, 75. 



1843-81. Turritella imbricataria, var- ft, Nyst, Coq. foss. Terr. tert. Belg., p. 396, pi. xxxvii, fig. 5, 

 1843 ; T. incrassata, var. imbricataria, Conch. Terr. Tert. Belg., p. 83, pi. vi, fig. 12/, 1881. 



1891. Turritella imbricataria, Harris and Buitows, Eoc. and Oligoc. Paris basin, p. 87. 



1912. Turritella (Haustator) imbricataria, Cossmann, Ess. Paleocouch. com par., vol. ix, p. 114, 

 pi. viii, figs. 10, 11. 



Specific Characters. — Shell subulate, turreted, with an elongated spire, ending 

 in a fine, but twisted, apex ; whorls flattened, compressed above, expanded and 

 subangulated below, so as to project beyond those following; suture oblique, deep, 

 with the base of the whorl forming a step to the one above it ; ornamented with 

 inconspicuous spiral rklges extending to the base of the shell. 



Dimensions. — L. 55 mm. B. 12 mm. 



Distribution, — Not known living. 



Fossil : Eocene : Hampshire basin, France, Germany, Belgium. 

 Red Crag (derivative). 



Remarks. — Worn examples, often imperfect, of this shell, characteristic of the 

 Middle Eocene of Belgium, France and the Hampshire basin, are not infrequently 

 found in the Red Crag. They are unknown from the Coralline horizon, generally 

 differing in colour from the typical Red Crag fossils, and are no doubt derivative in 

 the latter, having come apparently from some older fossiliferous Tertiary deposits 

 once existing, but not now known, in or near the Crag region. I have found a 

 few fragmentary specimens at Oakley, but most of those in our public collections 

 have been obtained from the Newbournian beds of Waldringfield, where some other 

 fossils, also thought to be derivative, are not uncommon. 



The Turbo imbricatarius of Brocchi, an Italian species from the Lower 

 Pliocene, seems to be different both from Lamarck's Eocene shell, and from those 

 of our Crag deposits. 



1 Conch. Terr. Tert, Belg., pi. vi, fig. 12c. 



