793 



MONOGRAPHS OF THE GENERA 



EULIMA, NISO, LEIOSTMCA, OBELISCUS, 

 PYRAMIDELLA, AND MONOPTYGMA. 



By ARTHUR ADAMS, Surgeon, R.N., F.L.S, etc. 



Genus EULIMA, Risso. 



Tongue unarmed ; tentacles simple, subulate, eyes sessile at 

 their outer bases ; mantle enclosed, with a rudimentary siphonal 

 fold ; foot linguiform, produced in front, with a bilobed mentum, 

 operculigerous lobe developed, at the sides, into even-edged, un- 

 equal expansions or lobes. 



Operculum horny, ovate, subspiral. 



Shell elongated, white, smooth, polished ; spire produced, many- 

 whorled, frequently with an interrupted varix on one side, apex 

 acute ; aperture oval, pointed behind, inner lip reflexed over the 

 pillar ; axis imperforate ; outer lip thickened internally. 



Sgn> Pasithea, /. Lea ; Polyphernopsis, Portlock ; Balcis, Leach. 



1. Eulima polita (pi. clxix. f. 1), Linn. (Helix), Syst. Nat. 

 ed. 12, p. 1241. Strombiformis albus, Costa. Turbo albus, Dovov. 

 Turbo politus, Tiirt. Rissoa Boscii, Payr. Phasiauella polita, 

 Flem. Melania Boscii, Phil. Eulima Anglica, Sow. Conch. Ic. 

 fig. 5. 



E. testa elongato-turrita, solida, eburnea, nitidissima ; anfracti- 

 bus angustis, planis, contiguis; apertura minima, ovata, superne 

 acuminata. 



Elongately turreted, solid, white, subopaquc, polished ; whorls 

 narrow, flattened ; aperture small, ovate, acuminate posteriorly. 

 British Islands, etc. (Mus. Cuming.) 



2. Eulima distorta (pi. clxix. f. 6), Deshayes, Desc. des 

 Coq. Poss. de Paris. Melania distorta, Phil. Moll. Sicil. vol. i. 

 p. 15S. pi. 9. f. 10. 



