MOLLUSCA. 8il 
Sp. Cyprea Argus L., Rumen. Tab. 38, fig. D, Zncycl. méth., Vers. Pl. 350, 
fig. 1 ;—Cyprea variolaria Lam., Cuv. R. Ani., éd. ill., Moll. Pl. 49, fig. 
4 (a fig. of the animal with the shell transferred from Quoy et GAIMARD 
Voy. de V Astrol.) ;—Cyprea moneta L., Rumpw. Amb. Rariteitk. Tab. 39, 
fig. 0, Encycl. meth., Vers. Pl. 356, fig. 3, a species known by the name of 
Kauri (Cowry), which serves for small money in some countries of Africa 
and India. 
Section III. Cavity for respiration furnished with a network 
of vessels running on its walls, opening externally by an aperture 
of mantle. 
Family XI. Preumonica (Celopnoa ScHWEIG.). Hermaphrodite 
molluscs breathing air, most of them terrestrial, others aquatile, 
ascending to the surface of the water for respiration. Some naked, 
others testaceous. 
This division of Molluscs is treated of at length in the illustrated work of 
Dr Férussac, Histoire natur. des Mollusques terrestres et fluviatiles, Paris, 
1819 and foll, DxsHayss, after the death of Férussac, began the con- 
tinuation which was completed in 1851. 
I. Operculum. 
Ampullacera Quoy and GAIM. 
Note.—Shell of Ampullaria. Head bilobed, with rounded lobes in place 
of tentacles. Here belong the species of Ampullaria (Ampull. avellana and 
Amp. fragilis) of Lamarck. The genus seems to me to be of uncertain 
position. : 
IL. Operculum none true. 
Phalanx I. Eyes at the base of tentacles. Two tentacles 
only. The most aquatic. 
Ancylus Guorrr. Shell thin, obliquely conical, with apex 
acute, inflected posteriorly. Aperture oval, with margins very 
simple. Creeping body entirely covered by shell. 
Sp. Ancylus lacustris MUELL., Patella lacustris L., PFEIFFER Schn. 1. Pl. tv. 
fig. 46 ;—Ancylus fluviatilis, Patella fluviatilis GMELIN, Briarnv. Malacol. 
Pl. 48, fig. 6, Srurm Deutschl. Fauna, vt. Heft 4, Tab. 9, PFEIFFER Rik 
fig. 44. 
Concerning the place of this genus in the natural arrangement opinions 
are at variance. 'TREVIRANUS thought, from the anatomical investigation 
of Ancyl. fluviatilis, that the genus might indeed have some affinity with 
Lymneus, but still does not belong to the pnewmonica, because on the left 
side, between the mantle and the border of the ventral disc, a gillis situated 
