™, 
4 MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. 
Vitrina pellucida (Miiller). 
1774 Helix pellucida Miiller, Verm. Hist., ii., p. 15. 
1812 — limacoides von Alten, Syst. Abh., p. 85, pl. xi., f. 20. 
1818 — _ elliptica Brown, Mem. Werner. Soc., ii., p. 525, pl. 24, f. 8. 
1821 Vitrina beryllina ©. Pfeiffer, Deutsch. Moll., p. 47, pl. 3, f. 1. 
1830 — mudlleri Jeffreys, Trans. Linn. Soc., xvi., p. 325. 
1830 — diaphana Jeffreys, op. cit., p. 326. 
1830 — draparnaldi Jettreys, op. cit., p. 326. 
1830 — elongata Jetireys, op. cit., p. 327. 
1830 — depressa Jeffreys, op. cit., p. 327.. 
1833. — dillwynii Jeffreys, op. cit., p. 506. 
1850 — Jimpida Gould, in Agassiz, Lake Superior, p. 243. 
1852. — americana Pfeiffer, Proc. Zool. Soc., London, p. 156. 
1857 — angelicw Beck, Index, p. 1. 
1858 — eailis Morelet, Journ. de Conch., p. 8. 
1861 — _ pfeifferi Newcomb, Proc. Cal. Acad. Sci., p. 92. 
1877. — baudoni Delaunay, Journ. de Conch , xxv., p. 363, pl. 11, f. 5. 
1905 — alaskana Dall, Land and Freshw. Moll. Alaska, p. 35. 
PISTORY.— Vitrina pellucida 
(pellucida, transparent) 1s our 
“& only representative of a group of 
a, closely-allied species, in which the 
£ internal organization is in many 
cases more distinctive than the 
external aspect of the shell. 
The present species is dedicated 
with pleasure to Mr. Robert Welch, 
M.R.I.A., ete., of Belfast, one of 
the most enthusiastic and success- 
ful field naturalists of the day, 
whose assiduous researches are 
~ contributing so materially to in- 
' crease our knowledge of the 
_ mollusean fauna of Ireland. 
The species was first distin- 
guished by Miiller in 1774, and 
according to Dr. Gray was added 
to’ the’ British list= im 1777.) by 
Pennant, but this is an error, as 
the Helix pellucida of Pennant is 
described as an umbilicated species. 
Considerable confusion exists in reference to this species, but it 1s gener- 
ally accepted that the Vitrina pellucida of Miiller is not identical with 
that of Draparnaud, the latter being more properly referred to the Vitrina 
major of Férussac, a species much more restricted in its range. 
Dr. Jeffreys, in his more youthful writings, referred British specimens 
to several different species, as shown in the synonymy, but he afterwards 
united them under one name. 
It is the Helix virides of Brown, the Helix glaucina of Sheppard, and 
according to Clessin the Vitrina hiemalis of Koch. Dupuy reters to it 
the Vitrina tenerifiv of Graells, while according to Dr. Leach, Colonel 
Montagu regarded it as the fry of Helix nemoralis. Helix brevipes of 
Turton is also the young state of the present species. 
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