38 DFNLEY GASTEROPODA. 



Syn? 1831 Pleurotomaria conoidea, Desl. Coq. caract. pi. 



4, fig. 4. 

 1848 mutabilis, (var elongata and mutica) 



Desl. Mem. Soc. Linn, de 



JS-orm. YIII. pi. 10, figs. 



14, 15. 

 1850 conoidea, D'Orb. Pal. fr. Terr. Jur. 



2 Gast. pi. 382, p. 472. 



Ebrayeana, D'Orb. ibid. pi. 387, 



figs. 1, 2. 



Length — one attains 70 mm. Breadth, 52 mm. 



This is a variable shell ; the bands on the adult whorls differ 

 in appearance from those on the apical ones ; the keel is not a 

 simple elevated band, but is split up into several concentric lines 

 in the young state ; (this is less frequently seen in old shells.) 

 Again, the keel is interrupted by cross ridges sometimes, as in 

 D'Orbigny's figure (loc. cit. plate 382). There are decussating 

 lines on the young whorls. 



The band which marks the successive positions of the slit in 

 the external lip (we may call it for short, ''sinus-band") is 

 very little elevated, and is crossed by curved lines. 



If one may be allowed to judge from descriptions, I should 

 account P. Ehraymna, D'Orb. only this species in a different 

 state of preservation. 



We have no form which corresponds exactly with P. abhreviatay 

 Sow., but I fancy that it may be only a variety of this species. 



There are nine specimens in the Museum. 



Locality — Dundry. Inf. Ool. 



PLEUROTOMARIA PUNCTATA, Sowerby, (non Goldfuss.) 



1819 Trochus punctatus, Sowerby. Min. Conch, pi. 

 193, fig. 1 (and? 4), (=Pleu- 

 rotomaria, in Index.) 



