32 PROCEEDINGS OF THE MALACOLOGICAL SOCIETT. 



more parallel striae : the marks left by the individual teeth on the 

 radula (Fig. 2). 



I am not aware of any precisiely similar case to this having been 

 recorded. Limpet ' licks ' and the marks left by Liinncea when 

 feeding on the algae on the side of a glass aqunriura, are tolerably 

 familiar, but very few observations on the trails of land mollusca have 

 been put on record. 



In 1846 Ebenezer Emmons, in the " Agriculture of New York," 

 vol. i, described (p. 68) and figured (pi. xiv, fig. 1), under the name of 

 Nemapodia tenuissima, what he at first mistook for a fossil in the fine 

 green slate of Salem. Subsequently, however, in the explanation to 

 the plates, he admitted that it was the trail of some living animal, 

 probably of a Gastropod. 



Professor E. B. Poulton, in 1885 {Nature, vol. xxxiii, p. 176), 

 recorded that snails, probably Helix mpersa, had fed off the whitening 

 on his greenhouse glass ; but he gave no description or figure of the 

 trails. 



In 1893 Mr. "Woodworth {Science, vol. xxi, p. 1-57) described the 

 feeding-line of some snails of unascertained species on lichen-covered 

 Carboniferous rocks at Attleboro, Mass. "'These bands or trails," 

 which he said closely resembled that figured by Emmons, " were 

 made up of a series of crescentic cross-markings, united alternately, 

 right and left, with the next adjacent in the series, so as to form 

 a continuous, closely pressed, sigmoid line, which in itself constituted 

 the whole of the trail." 



Five years later Herr E. Eathay, in the Zeitschrift fur 

 Pflanzenkrmikheiten, Bd. viii (1898), pp. 129-133, described the 

 tracks left by Helix hortensis when feeding on the Pleurococcus 

 vulgaris growing on the bark of trees, and the figure of the trails given, 

 by him, here reproduced (Fig. 3), agrees very closely with Emmons' 

 illustration, and, like it, leaves very much to be desired in the matter 

 of detail.^ 



' M. Dollfus gave an abstract, of this paper, with a poor reproduction of the figure, 

 in the Feuille des Jennes NatnraUstos, torn, xxviii, pp. 211-212. 



