90 LIMACINEA. 



ture very large ; pillar lip, near its upper extremity, broad, flat, 

 and very slightly reflected at the edge ; outer lip dilated. 



Inhabits gardens, at Lambeth, and other localities near Lon- 

 don. It was found many years ago at Youghal, Ireland, by 

 Robert Ball, Esq., of Dublin. The Irish specimens agree with 

 the T. scutulum of Sowerby. Mr. Thompson says it has also 

 been found in a garden at Bandon, by Mr. G. S. AUman. I 

 concur with Mr. Ball and Mr. Thompson, in considering the T. 

 Haliotoidea as an indigenous British and Irish species. 



Genus III ARION — Ferussac. 



Shell an oblong mass of granular, spongy, corneous substance, 

 enveloped in the mantle of the animal, sometimes consisting 

 only of a few granules in a rudimentary condition. 



Section 1. — Shell oval and concave. 



1. Arion hortensis. 



Variety 1 . Animal black, with gray streaks. 



Arion hortensis, Ferussac, Moll., G, pi. 11, f. 4, 5, 6, VIII, 

 a, f. 2, 3, 4; Gray, Med. Rep., 1821 ; Thompson, Ann. and 

 Mag. Nat. Hist., VII, p. 18; Limax subfuscatus, PfeifFer, pi. 

 4, f. 20 ; Limax hortensis, Grateloup, Moll. Dax., p. 55, f. 4 ; 

 Limacellus varicgatus, Turton, Man., p. 25, pi. 3, f. 16, shell; 

 Limacella concava, Brard, p. 121, shell. 



Variety 2. Animal gray, with a black streak on both sides. 



Arion hortensis, var. /3, Alder, Mag. Zool. and Bot., II, p. 

 105; Arion circumscriptus, Johnston, Edin. New Phil. Journ., 

 V, p. 77 ; Limax fasciatus, Nilsson, Fau. Succ, p. 3. 



Shell oval, misshapen, and somewhat concave. 



Inhabits woods in Great Britain and Ireland ; in the latter 

 country, Thompson says it is common throughout the North. 



Section II.— -Shell, if any, nearly circular, spongy, and 

 rudimentary. 



2. Arion empiricorum. 



Arion empiricorum, Ferussac, Hist. Moll., 60, p. 17, pi. 1, f. 

 23; Alder, Mag. Zool. and Bot., II, p. 105; Arion ater, 

 Thompson, Ann. and Mag. Nat. Hist., VII, p. 18; Limax ater, 

 Linno, Fau. Succ, p. 507 ; Miillcr, Verm., II, p. 2 ; Draper- 



