178 HELIX-SOLAROPSIS. 



H. PELLISSERPENTIS Chemnitz. PI. 50, figs. 74-76, 82-83. 



Narrowly umbilicate, depressed, convex, above solid, light brown- 

 ish with ill-defined narrow streaks following the lines of growth, a 

 series of chestnut arrow-shaped spots below the sutures and a similar 

 narrow one at the periphery ; the base generally showing a few 

 rather faint narrow spiral bands, either continuous or broken into 

 spots ; surface nearly lusterless, densely granulate (under a lens) 

 except the first 2* whorls which are smooth and shining, the gran- 

 ulation subobsolete around the umbilicus, where the striae of growth 

 are stronger; the spire is low-dome-shaped, obtuse; suture lightly 

 impressed ; whorls 6, gradually widening, the last obtusely keeled 

 around the circumference, with two deep rugose-striate pits on the 

 side opposite the aperture, one of them on the peripheral carina, the 

 other near it on the base ; base broadly concave around the narrow 

 deeply perforating umbilicus. Aperture broad-lunar, purplish with 

 a satin-like luster inside, oblique; peristome white, reflexed all 

 around, the columellar end partly concealing the umbilicus. 



Alt. 25, diam. maj. 48, min. 40 mill. 



Alt. 22, diam. maj. 40, min. 35 mill. 



Guiana; Brazil. 



Helix Pellis Serpentis CHEMNITZ, Syst. Conchy lien Cabinet, xi, p. 

 268, t. 208, f. 2046, 2047 (1795), not "Pellis Serpentis," etc., 1. c. 

 vol. ix, p. 79, t. 125, f. 1095, 1096 (1786). Helix pellis-serpentis 

 FER., Prodr., p. 39 ; Histoire t. 75A, f. 3. LAMARCK (in part) An. 

 s. Vert., viii, p. 41. PFEIFFER in Kuster's Conchyl. Cab., p. viii, t. 

 2, f. 3, 4 ; Monographia Hel. Viv., i, p. 371 ; iii, p. 237 ; iv, p. 285 ; 

 v, p. 373. CHENU, 111. Conchyl., Helix, t. 8, f. 2. REEVE, Conch. 

 Icon., f. 542. Solaropsis pellis-serpentis BECK, Index, p. 27. Heli- 

 cella pellis-serpentis SWAINSON, Malacol., p. 333, f. 98. " Helix 

 undata" of early English collectors. / f H. colubrina PERRY, Con- 

 chology, t. 15, f. 4. Helix constrictor HUPE, in Rev. et Mag. Zool., 

 1853, p. 298. 



Separated from all other species of Solaropsis by the two deep 

 pits which indent the base and periphery of the body-whorl, much 

 like those of H. cepa. 



H. SERPENS Martyn. PI. 58, figs. 38, 39, 40, 41 ; pi. 59, figs. 50, 



51,52. 



This species is similar to H. pellisserpentis in all characters except 

 that it lacks the desp pits on the body-whorl possessed by that form. 



