OF SOUTHERN INDIA. ally) 
This type, which is well characterised by the cylindrical shape of the whorls, 
and the usual irregularity in the last of them, has not been as yet met with in the 
eretaceous strata, but it abounds in great variety in the eocene beds, decreases very 
considerably in the neogene, and only four species are quoted by Adams as living : 
All the fossil species have tolerably prolonged anterior canals, and it is not certain 
whether it would not be better to reserve the name Clavellithes of Swainson for 
the species with avery short canal and an excavated columella, as Cl, avellana and. 
distorta. (vide Pollia.) Species like Cl. (Fusus) tuberculosa, Desh. and Cl. (Fusus) 
rugosa, Lamck, form transitions to the next generic group, as restricted under the 
name, I donot think that there is any real necessity to separate Thersitea, Coquand, 
(Géol. and Pal. de Const, 1862, p. 267, Pl. XXIX, Figs. 30—383) from other Clavelle, 
especially if the distinction between Clavella and Clavellithes he accepted. 
4— Fusus, Klein, 1753,* Shell fusiform, elongated, last whorl—including the 
canal—shorter than the turreted spire; canal more or less produced, at least equal to 
the height of the last whorl, straight, inner lip smooth, outer lip grooved internally, 
whorls spirally striated and ornamented with rudimentary uniform varices. 
The greatest number of species of usus, as restricted, are living; they are 
pretty numerous still in the neogene but much less so in the eocene strata, and of 
all the endless number of cretaceous Fuss, as known, only very few will be found 
to exhibit the characters of this genus sufficiently. 
We have to notice only one species of Fusus, F. verticillatus, n. sp. 
5—Tritonidea, Swainson, 1840. Shell ovate, buccinoid, last whorl sub-ventricose, 
canal short, or moderately prolonged, bent to the left, and on its termination recurved ; 
rudimentary varices numerous, all of equal strength, crossed by elevated thick 
spiral lines; inner lip anteriorly thickened, smooth, posteriorly thin or cross- 
grooved, often toothed at the end; outer lip thin, internally suleated. H. and A. 
Adams consider this group only as a sub-genus of the next, but I think it ought to 
be kept distinct, if once a division of the old genus Fusus be acknowledged. 
6—Pollia, Gray, 1839. (Cantharus, Bolten, apud Adams.) Shell buccinoid, 
whorls convex with rudimentary and equally formed varices, and spiral elevated lines, 
last whorl ventricose, siphon very short and barely recurved; mouth ovate, inner lip 
thin, cross-grooved in the entire extent, and posteriorly toothed ; outer lip thickened 
internally and denticulated. 
Gray established this genus in the Zoology of Beechy’s Voyage, p. 111, for a num- 
ber of named and unnamed species, among the determinations of which he himself 
proposed afterwards great alterations ; but he does not seem to notice it at all in his 
Catalogue of 1857. Adams quotes only five species under Pollia and 32 under 
Tritonidea, there cannot be however any doubt, that considerable changes must be 
* The author’s name designates (as in Aporrhais) only the first proposition of the name Fusus, although 
its characters were afterwards fixed by Bruguiére, Lamarck, a. o. and are still changing. It seems rather a 
mistake to substitute for such a universally acknowledged name as Fusus that of Colus, Humph., which, if 
it be correct, cannot have priority to that of Klein; but it is still more inconsequent in Dr. Gray to use the 
name Fusus, Humph. in another place, designating by it Rostellaria of Lamarck. 
ZG 
