NERITA. 399 
Qertta Mubiatilis. 
The Neritina fluviatilis (Brit. Moll. pl. 71, f. 1, 2) of authors 
is contained in the box marked for this shell in the Linnean 
collection, and alone of the Nerites there present agrees with 
the description and synonymy of the species. No difficulty 
was experienced in the recognition of this shell, thanks to the 
correctness of its synonymy, and the circumstance of the cited 
delineations having been sufliciently accurate to distinguish so 
common and widely diffused a species. 
sevita littoralts, 
The extreme abundance and Swedish locality of this shore- 
frequenting shell seems to have caused its early recognition, 
despite of an utterly insufficient description and an erroneous 
synonymy. ‘The reference to Lister’s ‘ Historiz’ is easily cor- 
rected, section 5 being the true reading, and not section 8, 
where the engraving is utterly at variance with both the generic 
and specific features. Thus amended this synonym indicates the 
Iattorina (Turbo) Neritoides of Lamarck, which is the species 
described in the cited page of Lister's work on English shells. 
The reference to plate 2, f. 3 of that publication, which had 
been previously, and with more correctness, cited by Linnzus 
for H. nemoralis, was clearly a misprint for pl. 2, f. 11, for that 
drawing belongs to the referred-to description. The reference 
to Petiver’s ‘ Museum’ may be regarded as confirmatory of the 
accepted recognition, since that writer has quoted the figures in 
the two works of Lister, and declared it to be a common 
British species. Very many specimens of the Littorina Neri- 
toides (Donoy. Brit. Shells, vol. i. pl. 20, f. 2) are present in the 
Linnean cabinet, but whatever markings may have once been 
observable upon either them or their receptacle have now be- 
come obliterated. The dwarf freshwater! variety, on account 
of which Gualtier, who has represented Neritina fluviatilis or 
some closely-allied congener, was probably quoted, was not 
mentioned in the tenth edition. 
