82 CLASS III. GASTEROPODA. ORDER VI. PULMOBRANCHIATA. 
Pl. CLXXIV. Fiz. 93. 
Buximus Pireritus, Sowerby, Jun., Conch. Illus. 
Pl. CLXXIV. Fig. 94. 
Buuimus Mitteri, Sowerby, Jun., Conch. Illus. 
Pl. CEXXIV. Fig. 97. 
Buuimus JANeIRENSIS, Sowerby, Jun., Conch. Illus. 
PARTULA, De Feérussac. 
Testa ovato-oblonga, spira conoided, subobtusé, anfractibus gradatim 
majoribus, ultimo subventricoso, umbilicum formante; apertura 
subquadrata vel ovata, longitudine potitis superante ; margine in- 
tegro, crassiusculo, labro reflexo. 
The genus Partula was proposed by De Férussac for the reception of a 
small but interesting group of Colimacea, of which the well-known Helix 
faba of Gmelin may be regarded as the type. Lamarck included the 
Partule with the Bulimi; but, from a conviction that they form a very 
natural and well-defined series, we do not hesitate to distinguish them. 
The shell of Partula may be described as being ovately oblong, with a 
conical and rather obtuse spire ; the whorls become gradually larger, and 
the last, which is rather ventricose, forms an umbilicus ; the aperture is 
somewhat square or oval, being rather longer than wide ; and the margin 
is entire and rather thick, with the lip reflected. 
Examples. 
Pl. CLXXV. Fig. 1 and 2. 
ParTuLA HYALINA, Broderip, Proceedings Zool. Soc., 1832, p. 32. 
Bulimus hyalinus, Deshayes. 
