ae 
430 HELICIGONA ARBUSTORUM. 
VARIATIONS IN SCULPTURE OF SHELL. 
Var. rudis Muhlf., Rossm., Icon., 1837, pts. v. and vi., f. 297e. 
Helix arbustorum var. depressa Férussac, Hist. Moll., 1822, pl. 27a, f. 8, 9. 
Helix xatartit Farines, Desc. Coq. Pyr. Orient., 1834, p. 6, ft. 7-9. 
Helix arbustorumt var. stentzi Rossm., Icon., 1837, vol. i., pl. 5, f. 78. 
Helix canigonica Fagot, Esp. Pyr. Gr. ardustorum, 1879, p. 4. 
Helix fagoti Bourguignat in Locard, Prodr. Mal. Fran., 1882, pp. 60 and 306. 
Helix arbustorum var. sendtneri Clessin, Regensb. Corresp.-Blatt., 1882, p. 10. 
Helix camprodunica Kobelt, Rossm. Icon., 1883, p. 37, f. 108. 
Helix xvatartii var. camprodunica Kobelt, Icon., vol. i., 1884, p. 37, f. 108. 
Helix trachia Bourguignat in Servain, Bull. Soc. Mal. France, 1889, vol. vi., p. 405. 
Flelix arbustorum var. alpestris f. costulata Kobelt, Icon., 1884, vol. i., p. 38, f. 109. 
The var. rpudis is depressed, strong-shelled, and rugosely plicate, with a per- 
ceptible umbilicus. The original figure shows a shell 18 mill. diam., and 14 mill. alt. 
The animal is described by Dr. Steenberg as of a yellowish-brown, tinged with 
reddish, and to possess a somewhat shorter flagellum than the typical form. (See 
Monog., pl. 35, f. 5). 
According to Westerlund, it is only found in the higher alps and is not known 
below about 3,500 feet. 
The sub-var. sendtneri is depressed, dark brown, and smaller than the type 
form, with an open umbilicus and prominent rib-like strive as in var. rudis. 
It is the Helix aherrata of Ziegler according to Clessin. 
Fic. 489. Fic. 490. 
Fic. 489.—Helicigona arbustorum sub-var. sendtner? Clessin. 
Fic. 490.—Helicigona arbustorum sub-var. stentzZ Rossm. (after Clessin). 
The sub-var. stentzi is a medium-sized and rugosely-striate shell with a rather 
open umbilicus and a subconoid spire. 
The sub-var. traehia differs by its less prominent costulations, less elevated 
but more convex spire, and the great development of the body whorl. The shell is 
24 mill. in diameter and 17 in altitude. 
By some oversight Dr. Servain cites Clessin’s figure of the var. rudis (Mollusk. 
Oesterr.-Ungarns, p. 178, f. 83) as perfectly representing his two species Helix 
trachia and Helix stentzi. 
The sub-var. xatartii is depressed in form, and moderately umbilicated, solid, 
strongly striate, and even subcostulate, yellowish in colour, tinged with green or 
by a burnt and brownish shade, with a few yellow fleckings on the body whorl. 
Diam. 19-20; alt. 13-14 mill. This form is also the var. canigonensis of Fagot and 
Moquin-Tandon. 
The sub-var. eostulata is larger and more depressed than the typical adpicola, 
but with bluntly-ribbed sculpture as in the var. watartii. Diam. 19; alt. 15 mill. 
The sub-var. camproduniea is subdepressed, strongly striate, of a yellowish- 
brown tinged with green, with a peripheral zone, and partially open umbilicus. 
Diam. 19 mill. ; alt. 12 mill. 
Fic. 491. Fic. 492. 
Fic. 491.—Helix arbustorum sub-var. depressa Férussac (after Férussac). 
Fic. 492.—Helix arbustorum sub-var. camprodunica Kobelt, Camprodon, Catalonia. 
The sub-var. eanigoniea is described as depressed, imperforate, somewhat thin 
and irregularly subecostulate, of a greenish-horny colour, with a transparent and 
partially effaced supra-peripheral brown band, and a thin and slightly reflected lip. 
Diam. 18-20; alt. 7-10 mill. 
The sub-var. depressa of Férussac is, according to Dr. Servain, identical with 
the sub-var. camprodunica of Kobelt, 
