﻿LITTORINA— NATICOPSIS. 189 



Turbo inflatus, Minister, 1 has a much larger spire, a smaller apical angle, and a 

 shorter body-whorl. 



Ampullaria Ponti, Goldf., 2 differs in being more globose and minutely striated, 

 in having the lips disjoined, and in the inner lip not being callous. 



Natica striolata, F. A. Romer, 3 and Natica spirata, F. A. Romer, 4 are some- 

 what similar forms, but are striated. 



Natica marginata, F. A. Romer, 5 and Natica inflata, F. A. Romer, 6 also seem 

 similar, but they are striated, longer, and less oblique. The former, however, 

 which has a shorter spire and is a smaller shell than the latter, looks very much 

 like our species. Clarke, 7 however, states that it is distinguished by a spiral 

 depression on the whorls below the suture. 



Turbo inflatus, Miinster, 8 according to Tietze, 9 seems to be a more globose shell 

 with a rather higher spire. It comes very close to the present form in general 

 shape, but is certainly, if Miinster' s original figure is to be trusted, distinct from it. 



III. Family. — Naticidj;, Forbes. 



1. Genus. — Naticopsis, M'Coy. 



The shells in this genus are very similar in general shape to the true Naticse. 

 They are frequently of large size, and are generally smooth, but occasionally are 

 longitudinally striated. They are not umbilicated. The lips are continuous, and 

 the inner lip is often very diffuse and callous. They extend from the Devonian to 

 the Trias. 



1. Naticopsis harpula, Sowerby, sp. PL XIX, figs. 3, 3 a, 4. 



1827. Mubex haepula, Sowerby, Min. Conch., vol. vi, p. 152, pi. dlxxviii, fig. 5. 

 1832. Nebita subcostata, Ooldfuss. In De la Beehe's Handbook (German 



edition), p. 532. 



1 1840, Miinster, ' Beitr.,' pt. 3, p. 90, pi. xv, fig. 25. 



2 1844, Goldf., ' Petref. Germ.,' vol. iii, p. 114, pi. cxcviii, figs. 17 a, b. 



3 1850, F. A. Komer, ' Beitr.,' pt. 1, p. 33, pi. v, figs. 7 a, b. 



4 Ibid., pt. 1, p. 34, pi. v, fig. 10. 



5 1843, F. A. Komer, ' Harz.,' p. 27, pi. vii, figs. 6 a, b. 



6 Ibid., p. 27, pi. vii, figs. 8 a, b. 



7 1884, Clarke, ' Neues Jahrb. f. Min.,' Beil.-Band iii, p. 354. 



8 1840, Miinster, ' Beitr.,' pt. 3, p. 90, pi. xv, fig. 25. 



9 1870, Tietze, ' Dev. Schicht. Ebersdorf,' p. 39, pi. ii, fig. 24. 



