Monograph on the Ci/praidece, hy Mr. Gray. 71 



tore acute above, regularly rounded at the base, and extendiivg 

 from the centre of the revolutions or base of the column, to an 

 equidistance between the base and apex of the spire, base of the 

 columella slightly projecting into au obtuse angle, exterior lip 

 whitish, reflected, length \ of an inch. 



" Animal pale, rostrum and tentacula blackish, operculum 

 simple, not spiral, yellowish brown, minutely granulated." 



Oligyra orbiculata. Say Jour, Acad. Nat. Sci. p. 283. Amcr. 

 Conch. 



East Florida. Say. 



Hclicina striata. 



Testa depresso-ovata, tenuis, subpellucida, oblique striata, albi- 

 da; columella lutescente, labro margine subreflexo. Lamarck 

 Hist. vi. 103. 



Porto Rico. Mauge. Diameter five lines. 



Akt. XI. Monograph on the Cj/prwideoi, a Famihy of 

 Testaceous Mollusca; hi/ Mr. John Edwauj) Guav. 



CYPR«inBi«. 



Concha. Martial. Concharum Veneris pars, Lister Conch. Por- 

 ccliana. Guultier. Martini. 



Cypra;arum et Bullarum pars, Linn. Partie des Buccinoides. 

 Cuvier. Partie des Siphonobranches, Duuieril. GoldJ'uss. Par- 

 tie des enroulees, Lamarck. Partie des apomastonies enroulces, 

 Ferussac, Angyostomes involves, UluinviUe. 



Cu&it. DiF. Animal.^ unistxuale, capife vt disco distinclis. Ten- 

 taculis duobus coiiico-subulatis, oculis sessilibus ; brunchiis pec- 

 tinatis, pallio margine reflexo ; operculo nullo. Testa non sym- 

 metrica subinvolut{l demum corticati. Apertura elongatd, lineari 

 extremitate utraque canuliculati. 



Animal unisexual, head distinct, tentacula two, conical, awl- 

 shapcd, eyes two, sessile, at the external angle of the base of the 

 tentacula. 



Rcspiialory cavity open, oTcr the back of the neck; ^ills in a 



