NEEINEA PAUXILLA. 25 



it not for the distinct posterior canal, mighl be considered a layer of the 

 shell inside the outer, such as occurs most conspicuously in Monodonta labia 

 Linn., and some species of Osilinus. On careful examination, this seems to 

 be no part of the original shell. 



The genus Eunema, to which I am inclined to refer this species, — though 

 not without hesitation, — is reported, as ranging from the Silurian to the 

 Cretaceous formation. Zittel, in his recent Handbuch der Palceoniologie, 

 I. Band, 2. Abtheilung, p. 189, 1882, assigns it to the subfamily Turbinince. 

 Salter, Morris and Lycett, and Stoliczka concur in regarding it as belonging 

 to the Littorinidce. In the specimen before us, the mode in which the last 

 whorl receives the preceding one finds no counterpart in any member of the 

 Turbinince, while the general resemblance to Tectarius, and especially the like- 

 ness in the junction of the volutions and in the spiral ridges (not in the 

 aperture) to the recent Australian Osilinus comtrictus Macleay, forcibly suggest 

 the relation of the fossil to the Littorinidce. Coll. Bird. 



Locality and Position. — Abeih ; from the Turonian yellow marl. 



Nerinea pauxilla, sp. nov. 



Plate II, fig. 4. 



Testa parva, acumitiato-turrita ; spirce angulus 27°, sutures 93° ; anfraetus cir- 

 citer duodecim, medio profunde excavati et strih volveniibus minimis notati; margines 

 elevaii et minute crenulati, posterior fortior : apertura subquadraia, canaliculata ; 

 columella biplicata, imperforata : labri notes incognitos; canalis brevis id mihi vidi '"/■ 

 recurvus. 



Shell small, acuminatehy turreted ; angle of spire 27°, of suture 93°; whorls 

 twelve or more, deeply excavated in the middle and marked with very small 

 encircling lines; margins elevated and minutely crenulated, the hinder being 

 larger than the anterior: aperture subqnadrate, canaliculate; columella with 

 two folds, imperforate ; characters of outer lip unknown; canal short and 

 apparently recurved. 



Single specimen, adhering to a mass made up chiefly of broken shells, 

 ami strongly ferruginous. Length. 16 mm.; width, (i mm. 



Of the many other species described, none correspond verj nearly to this. 

 The Jurassic N. ccecilia d'Orb. — much larger — is perhaps most like it in 

 superficial markings. As in some other species of the same genus, the upper 

 margin of each whorl is larger, more prominent, and more crenulated than 



4 



