374 MOLLUSCA. 



MiTRA, Lam. 



The aperture oblong, with a few large plicae on the columella, the 

 one nearest the spire being the largestj the spire usually pointed 

 and elongated. Several species are brilliantly spotted with red on a 

 white ground(l). The foot of the animal is small; the tentacula are 

 of a moderate length, with the eyes on the side, near their inferior 

 third; the siphon also is of a moderate length, but it frequently pro- 

 trudes a proboscis longer than its shell. 



Caxcellaria, Lam. 



The last whorl ventricose; aperture ample and round, the internal 

 margin forming a plate on the columella. The spire is salient and 

 pointed, and the surface of the shell marked with decussating sul- 

 ci(2). The 



BucciNUM/ Lin. (3) 



Comprises all the shells furnished with an emargination or a short 

 canal inflected to the left, and in which the columella is destitute of 

 plicae. 



Brugieres has divided them into the four genera of Buccinum, 

 Purpura^ Cassis, and Terebra, part of which have been again subdi- 

 vided by Messrs de Lamarck and Montfort. The 



BuccixuM, Brug. 



Includes the emarginated shells without any canal, whose general 

 form, as well as that of the aperture, is oval. The animals — all such 

 as are known, are deprived of the veil on the head, but are furnished 

 with a proboscis, two separated tentacula, on the external side of 

 which arc the eyes, and a horny operculum. Their siphon extends 

 out of the shell. 



(1) Such are Fol. episcopalis,V\s\.., 839, 66;—Fol.papalis,lh. 67; and 840, 68; 

 — Fol. cardinulis, 838, 65. Add Fol. patriarchalis; — Fol. pcrtussa, 822, 40;— Fol. 

 vulpecula, iMartlni, IV, cxlviii, 1366;— Fol. plicaria. List., 820, 57;— Fol sangui- 

 suga. List., 821, 8;— Fol. caffra, Martini, IV, cxlviii, 1369, 1570;- Ful. acus, Id., 

 clvii, 1493, 1494;— To/, scabricula, Id., cxlis, 1388, 1389;— Fol. maculosa, lb., 

 1377;,— Fol. nodulosa, lb., 1385\—Fol. spadicea. Id., cl, 1392;— F. aurantia,lh. , 

 1393, 1394;— -F. decussata, 1395; — F. tunicula, 1376. 



(2) Foluta cancellata, L , Adans., VIII, i6;— Fol. reticulata, 830, 25, &c.— So- 

 werb.. Gen. of Shells, No. V. 



(3) M. de Blainville makes a family of his Faracephalophora DioYca Sipkono- 

 branchiaia of this great genus, whicl\ he calls the Exotomostoma- 



