r.4 



MOLLUSCA. 



[Gasteropoda 



Discovered by Dr. James Lindsay in Ditcham Wood, near Pfeiffer, p. 47, pi. 3, f. 1 ; Vitrina elongata, Turton, Man., p. 



Brenton, Hampshire, where lie collected about twenty speci- 31, f. 22; Helix pellucida, Mailer, Venn., II, p. 16; Pennant, 



mens. Its habitat is among moss at the roots of trees. As Brit. Zool., IV, p. 138, No. 134; Helix elliptica, Brown, Wer- 



this shell is a well known continental species, and having been nerian Mem., II, p. 525, pi. 24, f . 8 ; Helicolimax pellueidus, 



found in one locality only, it is probable that it has been intro- Ferussac, Hist. Moll., pi. 9, f. 6. 

 duced among plants. Shell elliptical, subdepressed, very thin, of a pale yellowish- 



41. Helix makgaritacea, pi. XVII, f. 54, 55, 56. — First green colour, hyaline, and extremely glossy; body very large, 



Ed., pi. 40, f. 54, 55, 56. oblique; spire very small, and consisting of two volutions, 



Shell depressed both above and below, very thin and hyaline; which rise but little above the body, and terminate in an obtuse 



spire hardly elevated above the body, and consisting of three apex, well defined by a striated sutural line, discoverable only 



pretty well rounded and rapidly decreasing volutions; sides of by the aid of a lens; aperture oval, and very large, interrupted 



the body inflated, and rather thick in proportion to its size; above by the superior portion of the body; outer lip thin, fre- 



base rounded, and provided with a small and shallow umbilicus; queutly with a pale brown margin; pillar lip slightly reflected, 



aperture suborbicular, with a very thin outer lip; whole surface and a little concave above. 



of a pearly white, exhibiting iridescent reflections. Diameter 

 an eighth of an inch. 



Discovered by James Gerard, Esq., on an old wall at Cor- 

 storphine Hill, near Edinburgh. 



ORDER III— GASTEROPODA. 



Animals with straight bodies, never spiral, nor totally en- 

 veloped in their shell; the foot, or disc, situated under the 

 belly, united to the body nearly its whole length, and serving 

 as an organ of locomotion. 



Subject to some variety both in form and colour ; but all I 

 have seen are only entitled to rank as one species. 



This species is found in all localities ; for I have met with it 

 in very moist situations, among decayed leaves, under stones, 

 &c, and I have procured specimens near the summit of 

 Arthur's Seat, at Edinburgh, eight hundred feet above the 

 level of the sea. It prevails all over Ireland, and Thompson 

 has found it in high mountain localities. 



I first observed this species in the cabinet of Mr. Dixon, of 

 Bishop- Wearmouth, in 1810, and drew and described it under 

 the name of Helix virides, as it was the green variety. I after- 

 wards met with the pale yellowish-white variety, in 1814, at 

 Farbane, King's County, Ireland. 



Division I Pneumobranchije. 



Branchiae in the form of a vascular net, or the wall of a par- 

 ticular cavity, opening by a hole which the animal contracts or 

 dilates at pleasure. The animals respire air. 



Family I. — Limacinea. 



Animals almost wholly naked, with elongated bodies, creep- 

 ing by means of a ventral disc, with a narrow mantle bordering 

 their sides. 



Genus 1. — Vitrina Drapernaud. 



Shell oblong, thin, transparent, fragile, and glassy ; spire 

 short, depressed, with seldom more than three, rapidly increas- 

 ing volutions; body large; aperture very ample, its width being 

 generally greater than its length, and somewhat oblong; margin 

 of the outer lip thin; columellar side deeply emarginatc by the 

 body; columella merely a simple spiral line. 



1. Vitrina pellucida, pi. XVII, f. 6, 7, and 12 — First 

 Ed., pi. 40, f. 6, 7, and 12. 



Vitrina pellucida, Drapernaud, p. 119, pi. 8, f. 34 to 37; 

 Lamarck, An. San. Vert., VI, pt. 2nd, p. 53; Fleming, Brit. 

 An., p. 267; lb., Phil. Zool., II, p. 469, pi. 4, f . 1 ; Turton, 

 Man., p. 31, f. 21 ; Alder, Mag. Zool. and Bot., II, p. 105; 

 Forbes, Mai. Mon., p. 7 ; Thompson, Ann. and Mag. Nat. 

 Hist., VI, p. 19; Vitrina Dilliri/nii, depressa, and diaphana, 

 Jeffreys, Linn. Tr., XVI, p. 326; Vitrina Miilleri, Jeffreys, 

 Linn. Tr., XV, p. 326 ; Vitrina Drapernaudi, Leach, Moll., 

 p. 80 ; Jeffreys, Linn. Tr., XVI, p. 326 ; Vitrina beri/Uina, 



Genus 2. — Testacella. — Cuvier. 



Shell very small, compressed, placed externally on the animal, 

 auriform; apex obsoletely spiral, consisting of less than two vo- 

 lutions; aperture very large, wide, and oblique; columella flat; 

 outer lip reflected, and thin, with a slight sinus behind. 



This singular univalve is found attached to the back of the 

 animal, near its posterior extremity. 



1. Testacella Haliotoidea, pi. XVIII,* f. 15, 16. 



Testacella Haliotoidea, Drapernaud, p. 121, pi. 8, f. 44, 45; 

 Lamarck, An. San. Vert., VI, pt. 2nd, p. 52 ; Cuvier, An. du 

 Mus., V, p. 440, pi. 29, f. 6, 7 ; Thompson, Ann. and Mag. 

 Nat. Hist., VI, p. 19; Testacella scutulum, Sowerby, Gen. Rec. 

 and Foss. Sh., f. 3, 3; Testacellus Haliotoideus, Ferussac, Hist., 

 pi. 8, f. 5 to 9; Sowerby, Gen., f. 1, 2; Alder, Mag. Zool. and 

 Bot., II, p. 105 ; Testacella Europcea, Roissy. Buflbn, V, p. 

 252. 



Variety 1. Testacella scutulum, Sowerby. 



Shell auriform, ovoid, or elongated ; vertex rather large, 

 acute, placed at one extremity, and pointing to one side ; aper- 

 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. scuttdum of Sowerby. Mr. Thompson says it has also 

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

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

 Haliotoidea as an indigenous British and Irish species. 



