Genera of Terrestrial MoUusca, etc. 199 



iiatae, numerosse ; centralis tridenticulata, denticulo medio elongata; mediae 

 bidenticulatfe, denticulo interno elongato, externo brevi; marginales lati- 

 ores inasqualiter tridenticulatfe, denticulis versus marginem exteriorem 

 gradatim mlnoribus, interno autem valde producto. 



"Genus naturale, Vitriiice nuUo modo affine, sed Succinece proximum. 

 Lamina lingualis autem diversa videtur (Cf. Phil. Handb., p. 243) atque 

 etiam Maxilla (Cf. Terr. Moll. U. S., I, p. 213, pi. xiii, fig. 3)." 



Heynemann (Mai. Blatt., 1868, p. 110, taf. v, f. 10) has 

 description and figures of the teeth of Simpulopsis sulculosa 

 Fer., mentioning that the jaw Avas not observed. On the 

 accompanying plate we have given (PI. ix, figs. 7,8) copies 

 of several of Heynemann's figures of the teeth, as many of 

 our readers may not have access to the originals, and in a 

 subsequent part of this paper we have described them. 



With respect to the jaw not having been examined by 

 him, Heynemann refers to that fact as rendering the correct 

 classification of the genus difficult, but remarks that the form 

 of the lingual teeth suggests relationship to the Orthalicea* 

 rather than to the Succinea, iis shown by a comparison of 

 the marginals with those of B. auris leporis and papyraceus. 



H. and A. Adams (Genera, II, 127) adopt in 8uccinince 

 the following genera: — Simpulopsis, Succinea, Amphihu- 

 lima, Helisiga and Omalonyx, enumerating as species of the 

 latter, O. unguis, appendiculata and depressa. 



On reference to our subjoined notes on the so-called Suc- 

 cinea appendiculata from Guadeloupe, it will be observed 

 that the form of its teeth agrees generally with that ascribed 

 by Heynemann to Simpulopsis sidcidosa, while his sug- 

 gestions as to the aflinities of the latter genus (the jaw 

 being unknown to him) are supported by our discovery of 

 the character of the jaw in the Guadeloupe species. It 

 must not, however, be overlooked that while the animal of 

 Simpulopsis is entirely covered by the shell, that of the 

 S. appendiculata under consideration is limaciform, like 



*It must be remembered that we use the term Orthalicina in a Auch more restricted 

 sense than the Orthalicece of Albers and von Martens. See our notes on Systematic 

 Arrangement, Ann. N. Y. Lyc, x, p. 168. 



