HELIX. C3 



ing a young shell as mature ; compare, for instance, his 

 description of the young of a common Planorbis as Bulla 

 Jiuviatilis (Binney's ed. p. 71). 



Say's description is as follows : — 



Shell depressed, yellowish brown ; epidermis rugose, with mi- 

 nute, very numerous bristles ; whorls rather more than four, de- 

 pressed above, beneath rounded, forming a very obtuse angle rather 

 above the centre of the whorl ; umbilicus open, rather small, pro- 

 found ; labrum simple. 



Breadth rather more than three tenths of an inch. Inhabits 

 the North-West Territory. 



HEIilX BARBIGERA Redfield ....vol. iii. p. 21, pi. Ixxvii. fig. 2. 



Helix barbigera Redfield, N. Y. Lyceum, vi. 171, pi. ix. figs. 4, 5, 7. 



The figures referred to are fac-similes of those of Red- 

 field, showing the outline of the shell, as well as a magni- 

 fied view of a portion of the epidermis. 



HELIX EDVARDSI Bland. 



Plate LXXVIIL Figures 7, 9. 



T. imperforata, lenticular!, carinata, tenuiuscula, fulva; epidermide 

 castanea, supra in striis pilosis prostratis minutis elevata, — infra tuber- 

 culis acutis minutis creberrime munita, quae juxta aperturam setos erectos 

 gerunt ; spira convexo-conoidea ; anfr. 5, complanatis, lente accrescenti- 

 bus ; ultimo antice gibbo, subito subdeflexo ; apice minute granulate ; 

 basi convexo, parum indentata, lineis numerosis spiralibus sub epider- 

 mide impressis ; sutura profunde impressa ; apertura obliqua, transversa, 

 auriformi ; dente angusta, subarcuata, lamelliformi, praelonga, parietis 

 aperturalis coarctata ; perist. margine supero acuto, parum reflexo, infero 

 subarcuato, depresso, subreflexo, et ad anfraotum ultimum subappresso, 

 callo dentiformi intus instructo, obsolete inciso. 



SYNONYMS AND KEFEKENCES. 



Belix Edvardsi Bland, N. Y. Lyceum, vi. p. 277; Notes, p. i. pi. ix. fig. 14-16. 

 DESCRIPTION. 



Shell imperforate, lenticular, carinate, the carina obsolete near 

 the aperture, rather thin, beneath the epidermis pale brown ; the 



