536 . PLIOCENE MOLLUSOA. 



Scala (Clathrus) Harmeri, de Boiiry, MS. Plate XLVII, fig. 30. 



Specific Characters. — Shell differing from 8. proxima in its more concave 

 whorls, its deeper suture, in the form of its mouth and in the character of its 

 costae. 



Distribution. — Not known living. 



Fossil : Waltonian Crag : Little Oakley. 



Remarks. — When examining my collection of Scalas from Little Oakley, M. de 

 Boury selected one or two imperfect fragments which he could not identify with 

 any species known to him, proposing to call it S. Harm,eri, remarking it was 

 ''assez voisin^' to an Italian fossil he had described in 1890 as 0. proximns — a form 

 Prof. Sacco considered to be a variety of 8. communis, but which some other 

 writers considered as specifically distinct from the latter. With the Oakley frag- 

 ments referred to, M. de Boury sent me a similar specimen of 8. proxlma from the 

 Pliocene of Castel Arquato. While greatly appreciating the compliment, I preferred 

 at first to associate the two shells (figs. 30 and 31) as varieties of one of them, viz. 

 of 8. proxima (fig. 31), and when my plate was printed described them as such. 

 M. de Boury, however, retained his opinion, and in the present year renewed his 

 very kind offer, which under the circumstances it would have been ungracious to 

 decline for a second time. 



Scala (Clathrus) proxima, de Boury. Plate XLVII, fig. 31. 



1890. Clathrus proximus, de Boury, Boll. Soc. Malac. Ital., vol. xiv, p. 250, uo. 51, pi. iv, fig. 9. 

 1890 — 1. Clathrus communis, var. proxima, Sacco, Boll. Soc. Geol. Ital., vol. ix, p. 317, no. 5147, 



1890; Moll. TeiT. Terz. Piem., pt. ix, p. 23, 1891. 

 1903. Scalaria (Clathrus) proxima, DoUfus, Cotter et Gomez, Moll. Tert. Portugal, p. 10, pi. xxxiii, 



fig. 12. 

 1905. Scala (Clathrus) proximus, Kobelt, Icon, schaleutrag. europ. Meerescouch., vol. iii, p. 8, pi. lix, 



fig. lOr 



1912. Scala (Clathrus) proxima, Cossmann, Ess. Pak'oconcli. comj^ar., vol. ix, p. 36, pi. i, figs. 38, 39. 



Specific Characters. — Shell elongate, smaller and more slender than 8. communis, 

 fairly solid, imperforate; whorls convex, disjoined; spire conical, regularly and 

 gradually diminishing in size upwards ; ornamented by 8 or 9 narrow longitudinal 

 costge, prominent, reflexed, slightly oblique; mouth oval to circular, rather small; 

 peristome continuous, fohaceous ; outer lip varicose, thickened by the last rib ; 

 basal ridge wanting. 



Dimensions. — L. 30 mm. B. 10 mm. 



Distribution. — Not known living-. 



Fossil : Miocene : Portugal. 



Lower and Upper Pliocene : northern Italy. 



Bemarl's. — In the last clause I have explained why the present species, which 



