APORRHAIS PES-PELICANT. 433 



1890-3. Aporrhais pes-pelicani, Sacco, Boll. Soc. G-eol. Ital., vol. ix, p. 190, no. 2131, 1890 ; Moll. Terr. 



Terz. Piem., pt. xiv, p. 28, pi. ii, figs. 28—37, 1893. 

 189(3. Chenopus pes-pelicani, Bernays, Bull. Soc. Belg. Greol., vol. x (Memoires), p. 129. 

 1901. Aporrhais pes-pelicani, Br^gger, Norges geol. Unders^gelse, uo. 31, p. 661, pi. ix, fig. 5. 

 1908. Aporrhais pes-pelicani and vars., Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iv, p. 12, 



pi. ci, figs. 10 — 15 ; pi. cii, figs. 1 — 13; pi. ciii, figs. 1 — 6. 



1912. Aporrhais pes-pelicani, Tesch, Med. v. d. Eijks. v. Delfstoft'en., no. iv, p. 76, no. 182. 



1913. Che7iopus pes-pelicani, Cerulli-Irelli, Palaeont. Ital., vol. xvii, p. 275, pi. xxvi, figs. 29 — 31. 



Specific Characters. — Shell solid, elongate, turreted, irregularly triangular, 

 varying in size, with an acuminated spire and a compressed apex ; whorls 

 10 — 12, convex, subangulate in the middle, with a single row of longitudinal 

 plications on the keel of all but the last whorl, on which there are two or three, 

 the upper one the largest; the plications are nodulous and prominent on the lower, 

 and smaller and more numerous on the upper whorls ; ornamented also by very fine 

 spiral lines which extend to the base of the shell ; outer lip expanded into a three- 

 to four-fingered wing, along the middle of each finger of which the spiral lines of 

 nodules extend, although they are smaller and more numerous than on the whorls, 

 the upper finger running upwards along the spire but diverging from it, the 

 fingers having a strong groove on the under side ; the outer lip extends also to 

 the base, where it forms a triangular beak continuous with the rest of the wing ; 

 inner lip spread over the wing and the basal beak, behind which it is folded so as 

 to form a slight concavity. 



Dimensions. — L. 45 mm. B. (not including the wings) 14 mm. Specimens 

 from the Crag are usually smaller. 



Distribution. — Recent : British coasts, North Atlantic from Finmark to Gibraltar, 

 Iceland, Lofoten Islands. Mediterranean, Adriatic, zEgean. 



Fossil: Lenham. Coralline Crag : Gedgrave, Ramsholt, Gomer, 

 Sutton, Boyton. Waltonian : Walton-on-Naze, Beaumont, Little Oakley. New- 

 bournian : passim. Butleyan : Bawdsey, Butley. Icenian : Aldeburgh, Suffolk, 

 Thorpe near Norwich. Isle of Man, Wexford gravels. Pleistocene : March, Nar 

 valley. Generally diffused in the Pleistocene deposits of England, Scotland and 

 Ireland. 



Waenrode bed, Diestien, Casterlien {zone a Isocardia cor), Scaldisien, Poederlien : 

 Belgium. Scaldisien: Holland (Lorie). 



Miocene : central Europe. 



Lower Pliocene: Roussillon, Biot, Piedmont. 



Upper Pliocene : Piedmont, Monte Mario, Bologna, Livorno, Caltabiano, 

 A.ltavilla. 



Pleistocene : Sicily, widely diffused. Christiania (Br^gger), Trondhjem (0yen), 

 Uddevalla. Eemien deposits : Holland (Lorie). 



Bernards. — Much difference of opinion exists as to the respective priority of the 

 generic terms Aporrltais and Ghenopus. I adopt the former, which is the one 



