HELIX-SOLAROPSIS. 179 



Narrowly umbilicate, depressed, solid, light chestnut-brown more 

 or less streaked longitudinally, with a series of oblique or arrow- 

 shaped chestnut spots beneath the suture and a similar narrower one 

 at the periphery, the base showing a few narrow spiral more or less 

 articulated bands, generally rather obscure. The surface is almost 

 lusterless, substriate, under a lens seen to be covered with a dense 

 granulation (except the inner 2 2 whorls which are smooth) ; this 

 granulation generally nearly obsolete on the base, especially around 

 the umbilicus, where the radiating striae are much stronger. The 

 spire is low-dome-shaped, obtuse at apex ; sutures lightly impressed ; 

 whorls nearly 6, regularly, moderately widening, the last rather 

 obtusely but obviously carinated at the periphery, convex beneath, 

 rather broadly concave around the umbilicus, which is of the same 

 width as that of H. pellisserpentis (If to 3 2 mill.). The aperture is 

 broadly lunar, oblique, purplish-white inside ; peristome reflexed all 

 around, somewhat dilated and impinging on the umbilicus; parietal 

 callous very light and translucent as in H. pellisserpentis. 



Alt. 25, diam. maj. 49, min. 46 mill. 



Alt. 2f), diam. maj. 50, min. 45 mill. 



Alt. 23, diam. maj. 52, min. 45 mill. 



Guiana; Brazil. 



Limax serpens MARTYN, Universal Conchologist, t. 120 (1784X 

 CHENU, Bibliotheque Conchyliologique, ii, t. 40, f. 3. Helix 

 serpens PFEIFFER, Monographia Hel. Viv., iv, p. 284 ; v, p. 373. 

 H. pellisserpentis var. FEE., Histoire, t. 75 A, f. 2. PFR., Monog. 

 Hel. Viv., iii, p. 237. H. pellis-serpentis HUPE in Rev. et Mag. de 

 Zool. 1853, p. 296 ; and in Castelnau's Exped. dans I'Amer. du Sud, 

 Moll., p. 5. H. pellis-serpentis var. ft Integra DROUET, Essai sur 

 les Moll. Terr, et Fluv. de la Guyane Francaise, p. 51 (1859) ; and 

 probably, var. minor loc. cit., p. 52, t. 4, f. 45. Solaropsis serpens 

 MORCH, Cat. Yoldi, p. 9. 



There is considerable variation in the degree of carination of this 

 shell, as will be seen by comparing fig. 39 of pi. 58 with fig. 51 of 

 pi. 59, both drawn from specimens before me. Drouet has de- 

 scribed a small form as var. minor ; it is more distinctly marked by 

 spiral color-spots beneath than any specimens before me, and 

 decidedly smaller (alt. 24, diam. maj. 42 mill.). His figure is copied 

 on pi. 58, fig. 42. This species was very generally confused with 

 H. pellis-serpentis by the older authors. The whorls of the spire 

 exhibit part of the peripheral series of spots above the suture, as in 



