120 HELICEA. 



simple, at its inferior extremity terminating at the centre of the 

 base of the shell ; umbilicus none, but the umbilical region deeply 

 indented. 



Breadth more than one tenth of an inch. 



This shell was found by Mr. John S. Phillips on the banks of the 

 Delaware River, about ten miles from Philadelphia. It is much 

 more elevated and not so broad as H. arborea Nobis ; the aper- 

 ture also is of a different shape. It is much broader than the 

 If. chersina Nob. 



SYNONYMS AND REFERENCES. 



Helix egena SAY, (Binney's ed.) p. 30. 

 DEKAY, N. Y. Moll. p. 45. 



CHEMNITZ, ed. 2, i. 237, pi. xxx. figs. 19-21 ? (1846). 

 REEVE, Con. Icon. No. 1263, (1854.) 

 PFEIFFER, Mon. Hel. Viv. i. 31 ; iii. 32, non GOULD. 



HELIX FABRICII BECK. 

 PLATE LXXVII. FIGURE 17. 



T. subimperforata, conica, tenuis, striatula, pellucida, fulva; spira coni- 

 ca, acutiuscula ; sutura profunda; anfr. 6, convexi, angusti, ultimus latior, 

 basi convexiusculus, rnedio impressus ; apertura verticalis, late lunaris; 

 perist. simplex, acutum, margine columellari superne reflexiusculo, per- 

 forationem simulante. (Pfeiffer.) 



SYNONYMS AND REFERENCES. 



Helix Fabricii BECK, Ind. p. 21, (absq. desc.) 



MOLLER, Ind. Moll. Grcenl. p. 4. 



PFEIFFER, Zeit. f. Mai. 1848, p. 90; Mon. Hel. Viv. iii. 32. 



REEVE, Con. Icon. 1459, (1854). 



Helix nitida FABRICIUS, Fauna Gr. p. 389, teste PFR. et MOLL. 

 Conulus Fabricii MOKCH, 1857, Nat. Bidr. af Gr. 75, (absq. desc.) 



Remarks. I have not seen this shell. The figure, which 

 is enlarged, is a fac-simile of that given by Reeve from 

 the Cumingian Collection. The description is Pfeiffer's. 

 He also remarks that the shell is hardly distinguished from 

 fulva Drap. by its more convex, subperforated base. It 

 is a Greenland species. 



Fabricius thus describes H. nitida, which is quoted as a 

 synonym : 



