24 TESTACELLA MAUGEI. 



wliitisli Miildle Pliocene marls of Celleueuve, near Montpellier, may also be 

 returred to the saiuu species. 



j\cc(ir(liiig to M. Paul Fischer, all the tertiary Ti'^tairllw belong to the 

 iwiKijcl group, ami 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 moditications in the shape of various organs which they 

 affirm to exist in the speciuicns examined by them. 



Externally, no differences in the shell of 7'. mutujcl have been chronicled 

 or named by authors, but I have established a var. upcrta. for the reception 

 of the broad Azorean examples and reduced the Ti'dncdUi iisiiu'iia de Serres 

 to the rank of a variety. 



AVide variation has, however, been observed in the colour of the body. 

 Gassies and Fischer discriminated six different forms, two of them — var. 

 rdseo-fulce^ccn^, somewhat rare, and var. griseo-fulve!<ci'ii^—\i'\\\\o'ai any 

 tigurc or description, except such indication as their descrii)tive names imply. 



In the present work eiglit varieties are accepted, and two, var. a urea and 

 var. aperta, are described for the first time. 



Var. aperta Taylor. rARiAr/o.vs /.v form of shell. 



Shell ooinparaHvely wider ami Hatter or le.-^s convex tlian typo ; .\PKliTU7;K conse- 

 quently more npun and ovate. Length, 14 mill. ; diam., 8 mill. ; alt., 3 mill. 



Azores -Artliur Moielet (U. B. narbisliire, IflOl !) 



Var. asinina de Serres, Ann. Se. Nat., p. 409, 1«27. 



TcstaccUa aslninuin c'e Serres, Ann. Sci. Nat.. lS-7, p. J09. 

 Tcsiacvlla itwtispcssuiana .GrSit., Geog. Limac, p. 16, ISoo. 



Shell elongate and njarkedly narrower than type, more 

 es|iei-'ially anteriorly. Length, 13 mill. ; breadth, 5 mill. 



This variety has hitherto only been found in the fossil 

 .'-tate, in the Middle Pliocene freshwater deposits at Frontig- 



nan near (_'ette, in the Hcrault, but only im])erfeet specimens , ^ -■/■■</ ,11 



Iiave as yet been discovered, and these cannot be entiiel.y freed „ii,iin,i de' Serres x' LJ 

 from the rock in which they are imbedded (Gass. & Fischer, (after Uassici & FLvcher). 

 Mon. Test., 18.56, p. 42). 



rARIATIOXS /.V COLOUR OF ANIJLiL. 



Var. albina Gassies c^ Fischer, ]\Iouog. Testacelle, I806, pp. 38, 39. 



Liody and sole approaching old ivory in colour with a fawn-colourcil dorsal band. 

 According to (iassies and Fischer, this variety is characterized by ils voracity. 

 France — (Gassies i\: Fischer, op. cit. ). 



Var. g'riseo-nig'rescens Gassies & Fischer, IMonog. Testacelle, 1856, p. 3(1. 



liody sin(d<y-grcy, sides whitish speckled with black, foot-fringe very pale yellow. 

 This variety, which resembles Ai/riv/iiiiii.i: agirxlis in ils general fades and 

 colouring, is the common form in the Oiionde (Monog. Testacelle, 1856, p. 36). 

 Pembrokeshire — Near Pembroke, June 1885 ! .Mrs. Tiaylcr. 

 France — Common at Gradignan and Blanquefort in Uie Gironde (( lassies, 1876). 



Var. viridans Gassies & Fischer, Monog. Testacelle, 1S56, p. 38. 



]jody greenish-brown, analogous to bronze, ventral disc very lively orange-red. 



According to Morelet, this is the ordinary I'cn'tuguese form, and would apiicar to 

 constitute another age-link, joining South L'eland with the Iberian peninsula. 



Waterford— Niiiseiy garden, Wafcerford, Sept. 1883! J. H. Salter. 



Portugal — Common frimi the parallel of Coimbra to the shores of .VIgarve 

 (Morelet, Moll. INu't., 184.5, p. 18). 



Var. griseo-rubescens (iassies tV: Fischer, Monog. Testa.celle, ISod, p. 38. 



IJody rnfous, maculated with bii)\N'ii, side-fringe orange-red. 



'J'his is the form ligurcd by Fenissac Ifom Uristol specimens setit by l)i-. Leach. 



Dorset— liecldvy Gaidens, Coife Castle, No\'. ISS,"i ! Fustacc 15anke.s. 



Gloucester W.- Ibistid, .1. W. Cuiidall, Nov. 1883. 



France — (Gassies & Fischer, op. cit.). 



