435 



enus xxi. 



CYPRiEA: 



SHELL UNIVALVE, INVOLUTED, NEARLY OVATE, OB- 

 TUSE AND SMOOTH ; APERTURE LINEAR, TOOTHED 

 ON BOTH SIDES, AND EXTENDING THROUGHOUT 

 THE WHOLE LENGTH OF THE SHELL. 



Sub-divisions.^ 



* The Spire not quite concealed. 

 * * Obtuse, and the Spire quite concealed, 

 *** Umbilicated. 

 # # # # With the Margin thickened. 



* The Spire not quite concealed. 



exanthema. 1. Shell oblong, ferruginous, with 

 whitish round spots, and brown teeth. 



t These subdivisions are but little to be depended on, and can only be sup- 

 posed to apply to the shells when they are full grown ; for a junior and a senior 

 of the same species generally come under different heads. The following of 

 Gmelin's species are so indistinctly defined, that they appear to be undeserving 

 of any notice. C. ambigua, p. 3409. C. badia, p. 3414. C. cancellat a, p. 3414. 

 C. Chinensis, p. 3421. C.leucogastes, p. 3413. C. lineata, p. 3413. C.minuta, 

 p. 3406. C. ochroleuca, p. 3413. C. punctulata, p. 3404. C. purpurascens,p. 

 3404. C. pusilla, p. 3421. C. rufescens, p. 3404. C. similis, p. 3421. C. steU 

 lata, p. 3413. C. striata, p. 3421. C. translucens, p. 3404. C. vinosa, p. 3421. 



