24 TESTACELLA MAUGEI. 
whitish Middle Phocene marls of Celleneuve, near Montpellier, may also be 
referred to the same species. 
According to M. Paul Fischer, all the tertiary 7estacellw belong to the 
mauger group, and in common with other mollusca now restricted to western 
regions had formerly a more extended eastern range. 
Variation.— Although the anatomical details of British specimens show 
a structure in consistent agreement with the various figures I give, yet some 
authors show certain modifications in the shape of various organs which they 
affirm to exist im the specimens examined by them. 
EXTERNALLY, no differences in the shell of 7. mauget have been chronicled 
or named by authors, but I have established a var. apertu for the reception 
of the broad Azorean examples and reduced the Testacella usinina de Serres 
to the rank of a variety. 
Wide variation has, however, been observed in the colour of the body. 
Gassies and Fischer discriminated six different forms, two of them—var. 
roseo-fulvescens, somewhat rare, and var. griseo-fulvescens—-without any 
figure or description, except such indication as their descriptive names imply. 
In the present work eight varieties are accepted, and two, var. aurea and 
var. aperta, are described for the first time. 
Var. aperta ‘Taylor. VARIATIONS IN FORM OF SHELL. 
SHELL comparatively wider and Hatter or less convex than type; APERTURE conse- 
quently more open and ovate. Length, 14 mill. ; diam., 8 mill. ; alt., 3 mill. 
Azores—Artlhur Morelet (R. D. Darbishire, 1901 !) 
Var. aSinina de Serres, Ann. Se. Nat., p. 409, 1827. 
Testacella asininum Ce Serres, Ann, Sci. Nat., 1827, p. 409. 
Testacella monspessulana Grat., Geog. Limac., p. 16, 1835. 
SHELL elongate and markedly narrower than type, more 
especially anteriorly. Length, 13 mill. ; breadth, 5 mill. 
This variety has hitherto only been found in the fossil 
state, in the Middle Pliocene freshwater deposits at Frontig- 
nan near Cette, in the Hérault, but only imperfect specimens Sek ao eee 
have as yet been discovered, and these cannot be entirely freed gcinina de Serres, x 1h 
from the rock in which they are imbedded (Gass. & Fischer, (after Gassies & Fischer). 
Mon. Test., 1856, p. 42). 
VARIATIONS [IN COLOUR OF ANIMAL. 
Var. albina Gassies & Fischer, Monog. 'l'estacelle, 1856, pp. 88, 39. 
Body and sole approaching old ivory in colour with a fawn-coloured dorsal band. 
According to Gassies and Fischer, this variety is characterized by its voracity. 
France—(Gassies & Fischer, op. cit.). 
Var. griseo-nigrescens (rassies & Fischer, Monog. 'Testacelle, 1856, p. 36. 
Body smoky-grey, sides whitish speckled with black, foot-fringe very pale yellow. 
This variety, which resembles Agriodimax agrestis in its general facies and 
colouring, is the common form in the Gironde (Monog. Testacelle, 1856, p. 36). 
Pembrokeshire— Near Pembroke, June 1885! Mrs. Trayler. 
France—Comimon at Gradignan and Blanquefort in the Gironde (Gassies, 1876). 
Var. viridans Gassies & Fischer, Monog. 'Testacelle, 1856, p. 38. 
Body greenish-brown, analogous to bronze, ventral dise very lively orange-red. 
According to Morelet, this is the ordinary Portuguese form, and would appear to 
constitute another age-link, joining South Ireland with the Iberian peninsula. 
Waterford— Nursery garden, Waterford, Sept. 1883! J. H. Salter. 
Portugal—Common from the parallel of Coimbra to the shores of Algarve 
(Morelet, Moll. Port., 1845, p. 18). 
Var. griseo-rubescens (iassies & Fischer, Monog. 'Testacelle, 1856, p. 38. 
Body rufous, maculated with brown, sole-fringe orange-red. 
This is the form figured by Ferussae from Bristol specimens sent by Dr. Leach. 
Dorset—Rectory Gardens, Corfe Castle, Nov. 1885! Eustace Bankes. 
Gloucester W.— bristol, J. W. Cundall, Noy. 1883. 
France—(Gassies & Fischer, op. cit.). 
