ORDER PECTINIBRANCHIATA. 79 
Lamarck appropriates this name to those in which the 
varices are not contiguous on two opposite lines. 
If their canal be long and slender, and the varices armed 
with spines, they become the MUREX, properly so called, of 
Montfort. (Murex tribulus, List., &c.) 
When, with this long canal, the varices are mere knobs, 
they form the BRontis, Montf. (Murex haustellum, List., 
&c.) 
Some of them, which, with a moderate canal, have project- 
ing tubes, which penetrate into the shell between spiny vari- 
ces, constitute the TyPHIS, Montf. (Murex tubifer, Roissy. 
Brug. Journ. d’Hist. Nat. I. xi. 3.) 
When, instead of spires, the varices are furnished with 
folded lamellz, slashed, or divided into branches, they are the 
CHICORACEA, Montf. Their canal is long or moderate, and 
their foliaceous productions vary infinitely in figure and com- 
plication. (Murex ramosus, List., and all its varieties. Mur. 
Scorpio, Mart., &c.) 
When, with a moderate or short canal, the varices are 
merely knotty, and the base is provided with an umbilicus, 
they form the AQUILLA, Montf. Several species inhabit the 
coast of France. (Murex cretaceus, L., &c.) 
If the umbilicus be wanting, they are his LOTORIUM. 
(Mur. lotorium, L., &c.) 
Finally, when the canal is short, the spire elevated, and the 
varices simple, they are his TRITONIUM. ‘Their mantle is 
usually folded transversely on both margins. Very large ones 
inhabit the seas of Europe. (Mur. tritonis. L.) 
The varices are sometimes numerous, compressed, and 
almost membranous, constituting the TROPHONA, Montff. 
(Mur. magellanicus, Martini.) 
At other times they are compressed, very salient, and but 
few in number. (Mur. tripterus, Born. x. 18,19, &c.) 
