CERITHIOPSIS BARLEEI. 419 



afterwards referred by him to an Oligocene and different fossil described by Nvst 

 in 1813 as G. variculosum^ an identification which seems to me improbable, as our 

 specimens have no appearance of being derivative but appear to be genuine Crag 

 shells. 



The fact, however, that in 1881 Nyst figured a Scaldisien fossil as G. 

 punckdum {op. cit.), identifying it with Wood's G. punckdum of 1842 and with his 

 G. variculosum of 1848, but not with his o\\ r n Oligocene G. variculosum of 1843, 

 seems conclusive, showing he considered the two last named to be different. Our 

 Crag species therefore should revert to its original name of punckdum, variculosum 

 being confined to Nyst's Oligocene shell. 



There are several specimens of this species in the British Museum from Walton, 

 and I have found two or three, imperfect, at Oakley. There is another from 

 Ramsholt, somewhat worn, in the York Museum under the name of Gerithium 

 variculosum which may probably be the same. 



The shell from the Norwich Crag figured by S. Woodward in 1833 as G. punc- 

 tatum 3 is different, probably the variety icenica of Potamides tricinctus, Brocchi, 

 which, as stated above, is abundant at that horizon. 



Jeffreys referred the present form to B. reticulatum {nj>. cit.), a view which I 

 am unable to accept. 



Genus CERITHIOPSIS ) Forbes and Hanley, 1849. 

 Cerithiopsis Barleei, Jeffreys. Plate XLT, figs. 14, 15. 



1848-74. Gerithium tuberculare, var. subulata, S. V. Wood, Mou. Crag Moll., pt. i., p. 10, pi. viii, 



fig. 5 6, 1848 ; Cerithiopsis tubercularis, 1st Suppl., pt. ii, p. 181, 1874. 

 1867-85. Cerithiopsis Barleei, Jeffreys, Brit. Conch., vol. iv, p. 268, 1867; vol. v, p. 217, pi. lxxxi 



fig. 2, 1869 ; Proc. Zool. Soc. Lond., p. 60, 1885. 

 1873. Cerithiopsis Barleei, Seguenza, Boll. R. Com. Geol. Ital., vol. iv, p. 350, no. 226. 

 1892. Cerithiopsis Barleei, Locard, Coq. mar. Cotes de France, p. 117. 



1906. Cerithiopsis tuber •cnlaris, var. Barleei, Cossmann, Ess. Pak'oconch. conipar., vol. vii, p. 146. 

 1908. Cerithiopsis barleei, Kobelt, Icon, schalentrag. europ. Meerescouch., vol. iv, p. 117, pi. cxx, fig. 8. 



Specific Characters. — Shell minute, slender, forming an elongated pyramid, 

 with a broadish and excavated base; whorls 12, compressed, slightly convex, the 

 last one-third the total length ; spire regularly tapering ; ornamented by longitu- 

 dinal costse and by spiral lines, tuberculate at the points of contact, having no basal 

 ridge ; mouth irregularly rhomboid, truncated ; pillar very short, slightly curved ; 

 canal semi-tubular, with a deep and obliquely rounded notch at the base. 



Dimensions. — L. 6 mm. B. 2 mm. 



1 Coq. foss. Terr. Tert. Belg., p. 540, pi. xlii, fig. 9. 

 ~ Geol. of Norfolk, p. 44, pi. iii, fig. 29. 



