ORDER PECTINIBRANCHIATA. ra) 
In some, the lip of the margin is denticulated externally near 
the emargination. (Buccinum vibea, Martini, &c.) 
In others it is entire: the Buccinum of the second division 
of Gmelin, except the B. echinophorum, strigosum, No. 26, 
and tyrrhenum, which are cassidariz. It must also be recol- 
lected that among the true cassides, Gmelin appears to have 
made several repetitions. 
Morto, Montf. CAssiIpARtA, Lam. 
Was separated from cassis by Montfort. The canal curves less 
suddenly, and the whole shell leads directly to certain muri- 
ces. The animal resembles that of a buccinum, but its foot is 
more developed. (Buccinum caudatum, L., &c.) 
TEREBRA, Brug. 
The aperture, emargination, and columella of a true bucci- 
num, but the general form is turriculated; that is to say, the 
spire is lengthened into a point. ‘The whole of the last sub- 
division of the Buccina, Gm.: such as Buc. maculatum, 1. 
In the 
CERITHIUM, Brug. 
Very properly separated from the MUREX of Linneus, we 
observe a shell with a turriculated spire. The aperture is oval 
and the canal short, but well marked, and reflected to the left or 
backwards. The animal has a veil on its head, and is furnished 
with two separated tentacula, on the side of which are the 
eyes, and with a round horny operculum. 
Many are found fossil, Murex vertagus, List., &c., with the 
numerous fossil species described by M. de Lamarck, Ann. 
du Mus. 
It is also near the cerithia that we must place several fossil 
shells which form the genus nerinea of M. Detrance. This 
genus is distinguished by strongly marked folds on each 
