ATTSTKALIAN LAND SHELLS. 91 



ture, conical dull, rose- coloured ; whorls 4, convex, the last very 

 largely and openly dilated, suture deep ; aperture very large, 

 wide, openly and flatly expanded, giving the shell the appear- 

 ance of a scoop ; peristome simple, columella arched and not 

 thickened by a callus. 



Diameter, greatest - 46 ; least - 28 ; aperture - 36 long ; 025 broad of 

 an inch. 



Habitat. King George's Sound, W. Australia. Masters. 



This species may at once be identified by the broad, shallow, flattened 

 out appearance of the last whorl. 



222. Succinea Menkeana. Pfr. 

 Pfr., Mon. mi. Fiv., Vol. III., p. 14. 

 Succinea amphibia. Uenke, Moll. Nov. JIoll., p. 6. 



Shell ovately-elliptical, thin, distinctly striated, pellucid, shining, 

 horny ; spire short, papilla?fornied, suture deep ; whorls 2, the last 

 but one very convex, the last attenuated at the base ; columella 

 somewhat callous, regularly curved ; aperture slightly oblique, 

 regularly oval ; peristome simple, thin, margins approaching. 



Length - 27 ; breadth 0-14 ; height 0*15 ; aperture 0" 19 long ; 0*11 broad, 

 of an inch. 



Habitat. New Holland. Priess. 



This description is taken from the'author above quoted. 



Section B. OPEECULATA. 

 PNEUMONOPOMA. Ppeiffer. 



Mon. Pneiim. Viv., 1852, Introd., p. 1. Suppl. prim., 1858, p. 1. Suppl. 

 Sec, 1865, p. 1. 



Terrestrial Mollusca breathing air by lungs, and fur- 

 nished with an operculum attached to the foot of the 

 animal, by which it closes the aperture of its spiral shell. 



All the animals of this order strongly resemble each 

 other in structure, by which, besides the operculum, they 

 are easily distinguished from the other terrestrial Mollusca 

 (Limacidcv, Helicidce, Oncidiadce, Lymnceidce, Auricididce). 

 The sexes are strictly distinct, never hermaphrodites, as in 

 Helicea, and the animals bear 2 contractile, not retractile, 

 tentacles, at whose posterior or exterior bases the eyes are 

 placed. In some the mantle margin is free, by which 

 character Ferussac distinguished the Helicince from the 

 Turbines ; in others, the mantle is entirely hidden within 

 the shell. 



