Monograph on the Cj/prceidece, by Mr. Gray. 71 



ture acute above, regularly rounded at the base, and extending 

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

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

 columella slightly projecting into an obtuse angle, exterior lip 

 whitish, reflected, length -|- of an inch. 



" Animal paie, rostrum and tentacula blackish, operculum 

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



Oligyra orbiculata. Say Jour. Acad. Nat. Set. p. 283. Amer. 

 Conch. 



East Florida. Say. 



Helicina striata. 



Testa depresso-ovata, tenuis, subpellucida, obliqu^ striata, albi- 

 da; columella lutescente, labro raargine subreflexo. Lamarck 

 Hist. vi. 103. 



Porto Rico. Mause. Diameter five lines. 



Akt. XI. Monograph on the Cj/praiidece^ a Family of 

 Testaceous Mollusca ; by Mr. John Edward Gray. 



Cypr-^ipe^. 



Concha. Martial. Concharum Veneris pars, JLz^^er Conch. Por- 

 cellana. Gualtier. Martini. 



Cypraearum et BuUarum pars, Linn. Partie des Buccinoides, 

 Cuvier. Partie des Sipbonobranches, Diimeril. Goldfuss. Par- 

 tie des enroulees, Lamarck. Partie des apomastomes enroulees, 

 Ferussac. Angyostoraes involves, Blaintille. 



CuAR.DiF. Animal., unisexuale, capite et disco distinctis. Ten- 

 taculis duobus conico-subulatis, oculis sessilibus ; branchiis pec- 

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

 metrica subinvoluta demum corticata. Apertura elongata, lineari 

 extremitate utraque canaliculata. 



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

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

 tentacula. 



Respiratory cavity open, over the back of the neck; s^lls in a 



