88 LIMACINEA. 



Division I.— PNEUMOBRANCHIiE. 



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 emarginate by the 

 body ; columella merely a simple spiral line. 



1. VlTRINA PELLUCIDA, pi. IX, f. 21, 22, 23. 



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. 459, 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 Dillwynii, depressa, and diaphana, 

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

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

 p. 80 ; Jeffreys, Linn. Tr., XVI, p. 326 ; Vitrina heryllina, 

 Pfeiffer, p. 47, pi. 3, f . 1 ; Vit^nna elongata, Turton, Man., p. 

 31, f. 22; Helix pellucida, Miiller, Verm., II, p. 16; Pennant, 

 Brit. Zool., IV, p. 138, No. 134; Helix elliptica, Brown, Wer- 

 nerian Mem., II, p. 525, pi. 24, f . 8 ; Helicolimax pellucidus, 

 Ferussac, Hist. Moll., pi. 9, f. 6 ; Vitrina pellucida, Brown, 

 Ilhist. Conch., p. 54, pi. 17, f. 6, 7, and 12; lb., First Ed., pi. 

 40, f. 6, 7, and 12. 



Shell elliptical, subdepressed, very thin, of a pale yellowish- 

 green colour, hyaline, and extremely glossy ; body very large, 

 oblique ; spire very small, and consisting of two volutions, 

 which rise but little above the body, and terminate in an obtuse 



