OF SOUTHERN INDIA. 115 
any of our five specimens under examination, obtained from three different localities, 
- there is not a trace of any plaits or folds on the columella, except a slight tooth-like - 
thickening on the posterior termination of the inner lip. 
. Localities.—Kolakonuttom, Alundanapooram, between Andoor and Veraghoor. 
Formation.—Trichinopoly group. 
2. Hemirusus acuricostatus, Stoliceka. Pl. X, Fig. 19. 
Hemif. testa spira brevi, anfractibus gradatis composita, suturis impressis junctis, 
infra suturam subcanaliculatis, angulatis, transversim acute costatis, spiraliter minu- 
tissime striatis ; costis in ultimo anfractu duodenis, in anfractibus superioribus plus 
numerosis, omninis ad angulum subspinosis. 
Spiral angle 66°; sutural angle 8°. 
This species has the general characteristic form of others of the same genus, the 
whorls being contracted along the suture and the last much inflated, and—to all 
appearance—produced anteriorly into a straight canal, which' unfortunately is not 
preserved in our single specimen. From the previous species, the Hemifusus cinctus, 
the present form differs remarkably by having the posterior portion of the whorl 
not so deeply excavated, the sutural margin being less thickened, the transverse ribs 
much smaller in number and thinner, and the spiral strize only minutely marked. 
The spire appears to be also somewhat higher in proportion. The outer lip is quite 
sharp, sinuose, but not distinetly notched posteriorly ; the inner lip is evidently very 
thin, without any posterior thickening. 
Locality —Near Comarapolliam in the Trichinopoly district. 
Formation —Arrialoor group. 
b. Sub-family—FUSIN 2. 
The animals of the ruszv# have the head and tentacles moderately prolonged, 
the eyepeduncles thickened and usually for a short distance united with the former ; 
they are mostly ‘of a uniform red or olive colour; the operculum is ovate with an 
apical nucleus; the shell has the varices all of equal strength or they are obsolete ; 
the canal.is more or less prolonged, straight or slightly recurved. 
Although numerous alterations have been made, since Lamarck first introduced 
stricter arrangements in the genus Fwsus, the variety of shells at present admitted 
in this sub-family by the greater number of conchologists is still very great and can 
be classed only very gradually. There would probably not be any great difficulty in - 
making at least two farther divisions, namely, shells with strong equal transverse: 
varices and smooth or only striated shells; but such distinction could evidently be’ 
only of very limited value. The number and characteristics of the genera are far 
