382 HELIX PISANA. 
. FOREIGN DISTRIBUTION. 
Canary Islands—Var. grasseti, found in the north of Lanzarote, also recent and 
as a holocene fossil on Fuerteventura, T. Vernon Wollaston ! J. Cosmo Melvill. 
On Grand Canary it was abundant in the garden of Santa Catalina Hotel, Las 
Palmas, in March 1901 ! J. W. Taylor. Plentiful on the mountain sides and the 
topmost ridges of the barrancos about Las Palmas ! W. J. Farrer. 
VARIATIONS IN SUBSTANCE. 
Var. djerbanica Letourneux & Bourguignat. 
Helix djerbanica and zitanensis, Let. et Bgt., Prodr. Mal. Tunis., 1887, pp. 86, 87. 
SHELL deseribed as thick, opaque, and ponderous, usually dull yellowish, or 
with a slightly rosy tinge, spire convex, body-whorl large and slightly angulated. 
Diam. 17-21 mill. ; alt. 13-17 mill. (See Monogr., pl. xxxi., f. 18). 
The sub-var. zitanensis is described as uniformly pinkish-white, globosely 
tumid, thick and heavy shelled, with convex spire, rounded body-whorl, and a 
large and expanded mouth, with pearly interior. Diam. 17 mill. ; alt. 15 mill. 
FOREIGN DISTRIBUTION. 
Portugal—Var. djerbanica is reported from Lisbon, Oporto, Coimbra, Faro, and 
Sernache, by Prof. Hidalgo. 
Tunis—Var. djerbaniea is recorded from Houmt-Souk in the Isle of Djerba, 
from the environs of Zarzis, and the regions of Hamada. Sub-var. zitanensis is 
found on the Hill of Medinet-Zian, near Zarzis (Let. & Bet., op. cit.). 
Var. tenuis Taylor, Journ. of Conch., Oct. 1890, vol. vi., p. 28 
Helix pisana var. delicata Monterosato Ms. 
The var. tenuis has the shell very thin, and about four grains in weight. (See 
Monoer., pl. xxx., f. 7). 
The sub-var. delieata is described as delicate in texture, of a whitish colour, 
with broad sienna banding overlaid by black lineolation. (See Monoer., pl. xxx., f.21). 
WALES, 
Pembroke —Tenby, 1890 ! J. W. Storey, A. G. Stubbs, and Rev. J. W. Horsley. 
CONTINENTAL DISTRIBUTION. 
France —Sub-var. delicata, dunes d’Eseoublac-la-Baule, Deauville, Calvados ! 
Ph. Dautzenberg; and Moquin-Tandon records excessively thin shells from the 
coast at Calvi, Corsica. 
Sicily—Sub-var. dedicata, Palermo ! Marquis Monterosato. 
Morocco—Sub-var. delicata, Morocco, J. Cosmo Melvill. 
Canary Islands—Sub-var. delicata, Las Palmas, 1906 ! Capt. W. J. Farrer, 
VARIATIONS IN SIZE. 
y En . + A 
Var. magna Rossm., Iconog., 1839, pl. 47, f. 614. 
Helix pisana var. spheroidea Westerlund, Moll. Extram., 1878, p. 92. 
Helix chambardi var. maxima Letourn. et Bourg., op. cit., p. 82, 1887. 
Helix pisana var. mayor Locard, Conch. Portug., 1899, p. 50. 
Helix pisana vars. magnifica, ampla, and trregularis Monterosato, MS. 
SHELL much larger. The var. magna is figured by Prof. Rossmiissler as more 
than 27 mill. in diameter. (See Monogr., vol. i., frontispiece, fig. 7). 
It is also the var. spheroidea of Westerlund, described as larger and more 
spheroidal, and as represented in Rossmiissler’s Leonog. by f. 614, Dut this figure 
represents a very large shell of ordinary form, and is typical of var. magna Rossm. 
The sub-var. ampla is described as a large and 
somewhat solid shell, of a whitish colour, with 
diverse and varied black or fuscous bandines, or 
may be of a pallid hue with the lip tinged with rose. 
Diam. 25 mill. ; alt. 18 mill. 
The sub-var. magnifiea is deseribed as large, 
and somewhat thin, of a whitish colour, with many 
slender ochreous and black bands disposed in groups canis rere pee 
and broken up into rhomboidal blocks by radiately —— ampza Monts. 
arranged whitish areas. Diam. 24 mill. ; alt. 20 mill. Garden, S. Susanna, Rome. 
(See Monogr., pl. SOG GE) (Marquis Monterosato). 
