MR. G. F. ANGAS ON [Jail. 15, 



3. Descriptions of seven new Species of Land-Shells recently 

 collected in Costa Rica by Mr. Adolphe Boucard. By 

 George French Angas, C.M.Z.S., F.L.S., &c. 



[Keceived November 17, 1877.] 

 (Plate V.) 



Helix boucardi, n. s. (Plate V. figs. 5, 6, 7.) 



Shell narrowly and profoundly umbilicated, depressedly conical, 

 moderately thin, very finely radiately striated, white, the upper surface 

 ornamented with two fawn-coloured bands passing into chocolate to- 

 wards the apical whorls, or entirely fawn-colour, with a narrow effuse 

 chocolate baud next to the periphery ; whorls A\, somewhat convex, 

 strongly bluntly keeled at the periphery, with an impressed groove 

 below the keel ; apex obtuse, tinged with violet ; sutures impressed, 

 bordered with a narrow chesnut line ; base convex, white ; umbilicus 

 dark brown ; umbilical region tinged with lemon-yellow ; aperture 

 very oblique, narrowly quadrately ovate, pale violet within ; outer 

 lip a little expanded and reflexed, slightly sinuate and projected 

 above, arcuate below. 



Diam. maj. 13 lines, min. 10, alt. 7. 



Hab. Navarro, Costa Rica ; on leaves of trees. (Mus. Boucard.) 



Helix adela, n. s. (Plate V. figs. 8, 9, 10.) 



Shell umbilicated, discoidal, flattened, very finely radiately striated, 

 pale straw-colour, ornamented with a single narrow black band just 

 above the periphery of the last whorl ; whorls 3£, somewhat convex ; 

 spire very much depressed ; base flatly convex, with an excavated 

 area around the umbilicus which is shallow and non-perspective ; 

 aperture horizontal, narrowly oblongly ovate ; outer lip slightly ex- 

 panded and reflexed. 



Diam. maj. 12 lines, min. 9, alt. 4. 



Hab. Novarro, Costa Rica, on trees. (Mus. Boucard.) 



Helix jesofvs, n. s. (Plate V. figs. 11, 12.) 



Shell umbilicated, depressedly conoidal, moderately solid, very finely 

 obliquely striated and finely granulated, the granules being denser 

 on the last whorl and obsolete towards the apex, brown, with a pale 

 suffused band at the periphery of the last whorl ; whorls 5, some- 

 what convex, the last bluntly keeled, contracted and deflected behind 

 the outer lip ; apex obtuse ; base rather flattened ; aperture hori- 

 zontal, ear-shaped, brown, with a prominent, erect, slightly undulating, 

 lamelliform, transverse ridge within upon the wall of the body-whorl ; 

 peristome white, somewhat thickened and reflexed, with a short blunt 

 tooth at the base of the columella and a longer compressed triangular 

 one incurved within the aperture opposite the ridge on the body- 

 whorl ; margins united by an erect lamella. 



Diam. maj. 12 lines, min. 10, alt. 6. 



