GASTEROPODA PECTINIBRANCHIATA. 373 



VoLUTA, Lam., 



The aperture is ample, and the columella marked with large 

 plicae, the one furthest from the spire being the largest. The degree 

 of projection in the spire varies greatly. 



In some of them, Cymbium, Montf. ; Cymba, Sowerb., the last 

 whorl is ventricose; the animal has a large, thick and fleshy foot, 

 and a veil on the head, from the sides of which issue the tentacula. 

 The eyes are on this same veil outside of the tentacula. The pro- 

 boscis is tolerably long, and there is an appendage on each side of the 

 base of the siphon. They attain a large size, and many of them are 

 extremely beautiful(l). 



In others, Voluta, Montf., the last whorl is conical, becoming 

 narrower at the extremity opposite to the spire(2). The foot of the 

 animal is not so large as that of the preceding onesj their shells are 

 frequently remarkable for the beauty of their colours or their ar- 

 rangement. 



Marginella, Lam. 



Form of the shell, similar to that of a true Voluta; but the exter- 

 nal margin of the aperture is tumid; the emargination is but slightly 

 marked. The foot of the animal, according to Adanson, is very 

 iarge, and has no operculum. By turning up the lobes of its mantle 

 it partly covers the shell. The eyes are on the external side of the 

 base of its tentacula(3). 



M. de Lamarck also distinguishes the Colombella, in which the 

 plicae are numerous, and the varix of the external margin is inflated 

 in the middle(4). It appears that the operculum is wanting. 



(1) Volv. BetMopica, List., 797, 4;—V. cymbium, 796, 3, 800, 7;—V. olla, 794, 

 1;— r. Neptuni, 802, 8; — F". navicula, 795, 2;—F. papillaris, Seb., Ill, Ixiv, 9;— 

 V. indica. Martini, III, Ixxii, 772, 773; genus Melo, Sowerb., Gen. of Shells, No. 

 XXVIII; — cymbiola, Chemn., X, cxlviii; 1385, 1386; — V. praeputitun, List., 798, 

 1; — V. speclibilis,'D!ivilsi, I, viii, S. 



(2) Voluta musica, hist, 805, 14, 806, 15; — V. scapha, 799, 6; — V. vespertilio, 

 807, 16, 808, 17;— r. haehrea, 809, 18;— F". vexillum, Martini, III, cxx, 1098;— T. 



Jlavicans,lh.,xcv, 922, 923; — V. undulata. Lam., Ann. du Mas., &c. For the 

 otlier species consult the Memoir of M. Broderip, Zool. Journ., April 1825. 



(3) Voluta glabella, Adans., IV, genus, X, I; — Voluta f aba, Ih., 2; — Vol. pru- 

 num, lb., 3;^-Vol. persicula, lb., 4, and all pj xlii, vol. II, of Martini; — Vol. mar- 

 ginata. Born., IX, 5, 6. 



(4) Voluta mercatoria, List., 824, 43; — Vol. rustica, List , 824, 44; — Vol. mendi- 

 caria, and nearly all plate xliv of Martini, vol. II; — Col. strombiformis; — Vol. labi- 

 osa,- — Vol. punctata, &c., Sowerb., Gen. of Shells, No. IX. 



