MOLLUSCA. 811 



Sp. Cyprcea Argus L., RUMPH. Tab. 38, fig. D, Encycl. meth., Vers. PL 350, 

 fig. i ; Cyprcea variolaria LAM., Guv. R. Ani., ed. ill., Moll. PL 49, fig. 

 4 (a fig. of the animal with the shell transferred from QUOY et GAIMARD 

 Voy. de I' Astral.) ; Cyprcea moneta L., RUMPH. Ami. Rariteitk. Tab. 39, 

 fig. o, 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. Pneumomca(C(kpnoa$CHWEiG.). 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 

 DE FERUSSAC, Histoire natur. des Mollusques terrestres et fluviatiles, Paris, 

 1819 and foil. DESHAYES, after the death of FERUSSAC, began the con- 

 tinuation which was completed in 1851. 



I. Operculum. 

 Ampullacera QUOY and GrAiM. 



Note. Shell of Amputtaria. Head bilobed, with rounded lobes in place 

 of tentacles. Here belong the species of Ampullaria (Ampull. avellana and 

 Amp. frar/ilis) of LAMARCK. The genus seems to me to be of uncertain 

 position. 



II. Operculum none true. 



Phalanx I. Eyes at the base of tentacles. Two tentacles 

 only. The most aquatic. 



Ancylus GEOFFR. 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., PFEIFPER Schn. i. PL iv. 

 fig. 4 6 ; _ Ancylus fluviatilis, Patella fluviatUis GMELIN, BLAINV. Malacol. 

 PL 4 8, fig. 6, STURM Deutschl. Fauna, vi. Heft 4, Tab. 9, PFKIFFER L L 

 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 

 Lymnceus, but still does not belong to the pneumonica, because on the left 

 side, between the mantle and the border of the ventral disc, a gill is situated 



