CLATHURELLA CORDIERI. 239 



considered this form to be a dAvarf variety of G. linearis, but afterwards regarded 

 it as distinct, under the name of Clavatula perpidchra. 



In 1871 (op. cit.), Jeffreys, agreeing with Wood's earlier opinion, called it 

 G. linearis var. se.i[uali.s. Comparing our fossil with some minute specimens of 

 that species in the Norwich Castle Museum, I think his identification was right. 



It should be stated, however, that in his British Conchology (vol. iv, p. 369, 

 1867) he had adopted the same varietal name for the vars. intermedia and pallida 

 of Forbes and Hanley (1853), merging them together without explanation. Against 

 this Mr. J. T. Marshall has strongly protested (Journ. Conch., vol. xiii, p. 299, 

 1912), urging that the original names should stand. While I agree with this, I see 

 no objection to the use of aeqnalis for the present form, to which it is clearly 

 entitled. 



Clathurella Corditri (Payraudeau). Plate XXVIII, figs. 30, 31. 



1814. Murex echinatus, Brocchi, Couch, foss. subap., vol. ii, p. 423, pi. viii, fig. 3. 



1826. Pleurotoma Cordieri, Payraudeau, Moll. Corse, p. 144, pi. vii, fig. 11. 



1844. Pleurotoma reticulatum, Philippi, Euum. Moll. Sicilise, vol. ii, p. 165. 



1848. Clavatula cancellata, S. V. Wood, Mou. Crag Moll., pt. i, p. 61, pi. vii, fig. 9. 



1867. Defrancia reticulata, Jeffreys, Brit. Conch., vol. iv, p. 370, pi. Ixxxix, fig. 3. 



1873—5. Defrancia reticulata, Seguenza, Boll. R. Com. Geol. It ilia, vol. iv, p. 298, no. 126, 1873 ; vol. 



vi, p. 208, no. 188, 1875. 

 1888. Glaflacrella Cordieri, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Eouss., vol. i, p. 92, pi. xiv, 



figs. 10, 11. 

 1890. Clathurella Cordieri, Cams Prod. Faun. Medit., vol. ii, p. 424. 

 1905. Clathurella {Cordieri) reticulata, Kobelt, Icon, schalentrag. europ. Meerescouch., vol. iii, p. 351, 



pi. xcv, figs. 13 — 16. 

 1910. Peratotoma reticulata, CeruUi-Irelli, Palaeont. Ital., vol. xvi, p. 57, pi. v, figs. 25 — 32. 



Specific Gharacters. — Shell rather thin, fusiform ; whorls convex, the last more 

 than half the total length ; ornamented by narrow lamelliform longitudinal ribs, 

 and by spiral ridges which become prickly where they intersect them ; spire 

 turreted, more or less elongate ; apex acute ; suture deep ; mouth oval ; canal 

 distinct, turning slightly to the left ; outer lip curved, somewhat expanded ; pillar 

 nearly straight. 



Di)iiensions. — \j. 8 — 16 mm. B. 3 — 7 mm. 



Distribution. — Recent : British coasts (principally on the west and south) and 

 from Guernsey to Shetland. 



Mediterranean, from Gibraltar to the Morea, widely diffused. Adriatic, JEgean, 

 coasts of France, Spain, and Norway. 



Fossil : Coralline Crag : Sutton. Waltonian : Walton-on-Naze. 

 Newbournian : Bentley. Pleistocene: Selsey. Holocene : Portrush. 



Miocene : Italy, North Germany. Lower Pliocene : Italy. Upper Pliocene : 

 Italy — Monte Mario ; Sicily. Pleistocene : Sicily, Calabria, Tuscany. 



