276 MOLLUSCA.—CLASS IV. PTEROPODA. 
p- 415. Chemnitz, Conch., vol. viii. p. 65. Vignette 13. f. F. G. 
De Blainville, Manuel de Malacologie, pl. 46. f. 2. 
Anomia tridentata, Forskael. Gmelin. 
Carolina natans, Abildgaard. 
Hyalea cornea, De Roissy. 
Hyalea Chemnitziana, Peron and Lesueur. 
Hyalea papilionacea, Bory de St. Vincent. 
HAyalea Forskalu, D’Orbigny. 
CLEODORA, Peron and Lesueur. 
Testa alba, diaphana, triangularis, depressa, quoquoversum stillicidiata, 
anticé recurvata, posticé tricuspidata, lateribus lanceolatis, sulcatis ; 
apertura triangulari, ad lateres coarctata. 
The Cleodore only differ from the Hyalee in the form of their shells ; 
they are triangular, and more acuminated at the sides ; and are thinner, 
and consequently much more brittle and transparent. Peron and Le- 
sueur were the first to distinguish them as a separate genus, and Rang 
followed the same method of arrangement ; D’Orbigny, however, includes 
them with the Hyalee@, and we almost incline to think that they have been 
separated from them without occasion. 
The shell of Cleodora may be described as being white, diaphanous, 
triangular, depressed, and sulcated or slightly guttered, as it were: the 
anterior portion of the shell is recurved or beaked, and the posterior 
is extended into three points, the sides being lanceolated and slightly 
grooved ; the aperture is triangular, and somewhat contracted at each 
extremity. 
Example. 
Pl. CCXCV. Fig. 2. 
CLeopoRA CUSPIDATA, Quoy and Gaimard, Voyage de |’Astrolabe, Mol- 
lusques, pl. 27. f. 1 to 5. 
