Mr. G. Nevill on a new Species of kerne. 341 



graptidae of the genera Diplograptus and Climacograptus, 

 together with Lasiograptus and Azygograptus &c. 



France &c. — Didymograptus Murchisoni and its allies occur 

 in the inferior division of the Schiste ardoisier of Bre- 

 tagne * in association with Crustacea of Llandeilo type. It 

 is found also in similar strata near Oporto in Portugal f. 



[To be continued.] 



XXXIX. — Description of a new Species o/Acme and Varieties 

 from the Conglomerate Beds at Menton. By Geoffrey 

 Nevill, C.M.Z.S. 



Acme Foliniana. 



Testa turrito-elongata, imperforate, cornea, laevis et nitida ; spira 

 subrecta, paululum prope apicem obtusum eversa ; anfract. 

 6 aut 6^- (rarissime 7), convexiusculi, sutura distincta separati, 

 interdum inferne liuea incisa (more Eulimidarum) circumdata ; 

 apertura subverticalis, subquadrangalaris, marginibus callo laevi 

 junctis ; columellaris subrecta ; peristom. album, percrassum, 

 duplex. 



Typi anfr. 6-5; long. 5-5, diam. 1-75; apert. alt. 1*5, lat. 1-1 

 millim. 



This was an exceedingly abundant form, often in a perfect 

 state of preservation, at three different levels ; a few specimens 

 had seven well-developed whorls, the others 6 or 6£, increa- 

 sing very gradually and regularly, moderately convex, the last 

 two approximately of equal breadth ; apex blunt and obtuse, 

 the apical whorls with a slight inclination to the right (away 

 from the axis of the shell) ; perfectly smooth, polished, shi- 

 ning, of a more or less pale horny colour, sometimes so trans- 

 parent that the columella can be traced from the apex to the 

 base ; suture distinct, with a more or less obsolete incised 

 line close below it, as in many species of Eulima &c. ; aperture 

 a trifle everted, subquadrate, with a remarkable, pure white, 

 callous rib close to the peristome, imparting a duplex appear- 

 ance to the latter ; a thin callosity joins the margins. 



I have much pleasure in naming this, the giant of its 

 genus, after my friend the Marquis de Folin of Bayonne, 

 whose researches connected with minute marine species are 

 so highly valued and appreciated. 



* Tromelin and Lebesconte, ' Catalogue des Fossiles Siluriens,' 1875, 

 p. 46, &c. 



t Sharpe, "Geology of Neighbourhood of Oporto," Q. J. G. S. vol. v. 

 p. 147. 



