184 CLASS III. GASTEROPODA. ORDER VII. PECTINIBRANCHIATA. 
portant difference in the growth of these shells ; the Murices form a num- 
ber of periodical varices, the Fasciolariz do not. 
The shell of Fasciolaria may be described as being somewhat fusiform, 
and in some instances of considerable magnitude, with the spire acumi- 
nated, and often nodulous round the periphery of the whorls ; the aper- 
ture is elongated, whilst the lip is often crenated, and marked interiorly 
with numerous hair lines ; the columella is smooth, and thick, ending in 
a straight canal, which is generally about the same length as the spire ; 
the plaits are about four in number, occasionally less, and the lowest are 
always the largest. 
Example. 
Pl. CCXXXI. 
FAscIOLARIA PRINCEPS, Sowerby, Tankerville Catalogue, Appendix, p. 16. 
Kiener, Iconographie des Coquilles vivantes, pl. 12 and 13. 
Fasciolaria aurantiaca*, Sowerby, Genera of Shells, No. 30. 
FUSUS, Bruguiére. 
. 
Testa fusiformis, interdum magnitudine perampla, spira symmetricé acu- 
minata ; columella levi, arcuata, nunquam plicata, in canalem rec- 
tum, plus minusve elongatum, desinente ; apertura ovali, interdum 
superné angulata ; labro plerumque crenato, paululim inflexo, fauce 
nonnunquam striata. Operculum corneum, infra acuminatum. 
When Bruguiére entered upon his examination of the Linnean Murices, 
he set apart all those that are fusiform and destitute of varices, under the 
generic title of Fusus ; when, however, the Fusi of that author were dis- 
tributed by Lamarck in the formation of the genera Pleurotoma, Pyrula, 
Turbinellus and Fasciolaria, there only remained to the genus in question 
* When Mr. Sowerby published the accompanying figure of this beautiful shell for the first 
time in his ‘ Genera,’ he accidentally attached to it a name that had been already used by La- 
marck in reference to another species, ‘ Encyclopédie Méthodique,’ pl. 480. f. 1. a, b. 
