RAPHITOMA NEBULA. 273 



now living in British seas or in the Mediterranean, some of which it seems desir- 

 able to figure for the purpose of comparison. 



The specimen figured by Wood in 1848 as Pleurotoina nebula (Mon. Crag Moll., 

 pt. i, tab. vii, fig. 10), was afterwards regarded by him as an undescribed species for 

 which he proposed the specific name P. nebulosa. 



Prof. Br/srgger reports R. nebula from the post-glacial Tapes-banks of Christiania, 

 and Dr. 0yen from those of the Trondhjem district. 



Var. elongata, Jeffreys. Plate XXX, figs. 20, 21. 



1867. Pleurotoma nebula, var. elongata, Jeffreys, Brit. Conch., vol. iv, p. 385, pi. xci, fig. 2. 



1883. Raphitoma nebula, var. elongata, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Rouss., vol. i, 



p. 101. 

 1910. Baphitoina nebula, var. elongata, Cerulli-Irelli, Palaeont. Ital., vol. xvi, p. 69, pi. vi, fig. 48. 



Varietal Character's. — -Differs from the type form in size, its more elongate and 

 slender spire, and its less prominent sculpture. 



Dimensions. — L. 12 — 15 mm. B. 3'5 — 5 mm. 



Bistrtbution. — Recent: Guernsey, Plymouth, Arran Isle, co. Galway, Hebrides, 

 and Shetland. Finmark, Gothenburg, Brittany, Vigo. 



Fossil : Waltonian Crag : Little Oakley. Pleistocene : Caithness. 



Upper Pliocene : Monte Mario. 



Remarlis. — This shell is considered a variety of R. nebula by the authorities 

 quoted above. It seems to be an Atlantic rather than a Mediterranean form. I 

 have several specimens from Oakley, and Sign. Cerulli-Irelli reports it from the 

 Upper Pliocene of Monte Mario. Jeffreys remarks tbat he is by no means certain 

 that this form may not be specifically distinct. 



Var. Ginnaniana (Risso). Plate XXX, figs. 24, 25. 



1826. Mangelia ginnania, Risso, Hist. Nat. Eur. Merid., vol. iv, p. 220, pi. vii, fig. 99. 



1836. Pleurotoma ginnania, Scacchi, Cat. Conch. Regn. Neap., p. 13. 



1836-44. Pleurotoma Bertrandi,'Ph\\i^^\,'EiXi.\im. Moll. Siciliae, vol. i, p. 198, pi. xi, fig. 20, 1836; 



P. ginnanianum, vol. ii, p. 168, pi. xxvi, fig. 6, 1844. 

 1847. Pleurotoma Ginnanianum, Jeffreys, Anu. Mag. Nat. Hist. [1], vol. xix, p. 312. 

 1853. Mangelia nebula, var. Ginnaniana, Forbes and Haiiley, Brit. Moll., vol. iii, p. 480. 

 1873-5. Rapkitoma nebula (= -P. ginnanianum, Scacchi), Seguenza, Boll. R. Com. Geol. Italia, 



vol. iv, p. 298, no. 103, 1873 ; R. nebula, var. Ginnaniana, vol. vi, p. 210, no. 221, 1875. 

 1883. Raphitoma nebula, var. Ginnania, Bucquoy, Dautzenberg et DollCus, Moll. mar. Rouss., vol. i, 



p. 101. 

 1890. Raphitoma Ginnanianum, Carus, Prod. Faun. Medit., vol. ii, p. 420. 

 1905. Raphitoma (^Ginnania) nebula ginnanianum, Kobelt, Icon, schalentrag. europ. Meeresconch., 



vol. iii, p. 379, pi. xcvii, fig. 9. 



35 



