NEEINEA PAUXILLA. 25 



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

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

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

 be no part of the original shell. 



The genus Euneiua, 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 Haiidbuch dcr Paloeoniologie, 

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

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

 to the Littorinidce. In the specimen before ns, the mode in wliich the last 

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

 Turlinince, while the general resemblance to Tcciarim, 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 constrictus Macleay, forcibly suggest 

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



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



Nerinea pauxilla, sp. nov. 



Plate II, fig. 4. 



Testa parva, acuminato-turrita ; spirce angidus 27°, sidurce 93°; anfr actus cir- 

 citer diwdecim, medio prof unde excavati et striis volveniibus minimis notati ; margines 

 elevati et minute crennlati, posterior fortior : apertura suhquadrata, canaliculata ; 

 columella bipticata, impcrforata ; labri notcc incognita; ; cunulis brevis tit mihi videtur 

 reatrvns. 



Shell small, acuminatel^^ 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 subquadrate, canaliculate ; columella with 

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

 apparently recurved. 



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

 and strongly ferruginous. Length, 16 mm. ; Avidth, 6 mm. 



Of the many other species described, none correspond very nearlj' to this. 

 The Jurassic N. cwcilia 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 \\\\oy\ is lai-ger, more prominent, and more crenulated than 



