70 MOLLUSCA. 



NASSA, Lam. 



The side of the columclla is covered by a more or less broad and 

 thick plate, and the emargination is deep, but without a canal. The 

 animal resembles that of a true Buccinum, and there arc gradual 

 transitions among the shells, from one subgenus to the other*. M. 

 IVlaiuaick calls 



EBURNA, Lam., 



Those, which to a smooth shell without a plicated margin, add a 

 widely and deeply umbricated columella. The general form of their 

 Oicll is closely allied to that of the Olivee. Their animal is unknown f> 



ANCILLARIA, Lam. 



The same smooth shell, and at the lower part of the columella a 

 marked lip; there is no umbilicus, neither is the spire sulcated. The 

 animal of several species resembles that of the Olivse, the foot being 

 still more developed J. The same naturalist calls 



DOLIUM, Lam. 



Those in which projecting ribs, that follow the direction of the 

 whorls, render the margin undulated ; the inferior whorl is ample and 

 ventricose. Montfort subdivides them into 



DOLIUM, properly so called, where the lower part of the columella 

 is twisted, and into 



PERDIX, where it is trenchant.|| 



Their animal has a very large foot, widened before ; a proboscis 

 longer than its shell, and slender tcntacula, on the external side of 

 which, and near the base, are the eyes ; the head has no veil, nor has 

 the foot an operculum. 



HARPA, Lam. 



The Harpse are easily recognized by the projecting, transverse ribs 

 on the whorls ; the last of which forms a lip on the margin. The 

 shell is beautiful, and the animal has a very large foot, pointed behind, 



* Bucrinum arcularia, List., 970, 24,25; B. pullus, List., 971, 26; B. gib- 

 bosulum, List., 972, 27, and 973, 28 ; B. tcssellatuw, List., 975, 30 ; B. fossil e, 

 Martini, III, xciv, 912, 914 ; B. mnryinatinn, Id. cxx, 1101, 1102 ; B. reliculn- 

 fum, List., 966. 21: B. vulgutiirn, Martini, IV, cxxiv, 162, 166; B. stolatnm, 

 Ib., 1167, 1169 ; B. glans, List., 981, 40; B. papilloswn, List., 969, 23 ; B. 

 nifiilulum, Martini, IV, cxxv, 1194, 1195. 



f Buccinum ylabratv.m, List., 974, 29; B. spiratum, List., 981, 41 ; B. zey- 

 lanicitm, Martini, IV, cxxii, 1119. 



t Ancilluria cinnmnomfa, Lam., Mart., II, pi. 65, f. 731 ; J'olvta ampla, Gm., 

 Mart., Ib. f. 722, and the species described by M. dc Lamarek and figured in the 

 Encyc. Method., 393. See also the Monograph, No. 36, p. 72, of the Ancillariae by 

 M. W. Swainson, Journ. of the Sc. and Arts, No. 36, p. 272. 



Btic. oJeurittm, List., 985, 44, and Sowerb., Gen. of Shells, No. 29 ; B. galea, 

 List., 898, 18 ; B. tJolium, List., 899, 19 ; B.fasciatvin, Brug., Mart., Ill, cxviii, 

 1011 ; B. pomum, Id., II, xxxvi, 370, 371. 



|| Bucc. pcrdi*, List., 984, 43. 



