Records of the Geological Survey of India. 
[vol. x. 
24 
h. —Specimen fig. 2 : 
Spiral angle apical portion 
... 
... 
... 46° 
apertural portion 
... 26° 
Sutural angle 
... 106° 
Total height 
... 62 mm. 
Height of the last whorl 
... 
23 mm. 
Height of last whorl to total length 
3 7 
' lOO 
Breadth ... 
... 31 mm. 
c. —Specimen fig. 3, (fragment.) 
Spiral angle, apertural portion ... 
Sutural angle 
Height of fragment ... 
Height of specimen restored 
Height of last whorl ... 
Proportion of last whorl and total height 
Breadth 
d. —Specimen fig. 4: 
Spiral angle 
Sutural angle 
Height of fragment 
Height of shell restored 
Heigtli of last whorl ... 
Proportion of height of last whorl and total of shell 
34° 
104° 
47 mm. 
57 mm. 
16 mm. 
17° 
100 ° 
44 mm. 
95 
21 mm. 
iji_ 
i oo 
35 mm. 
Breadth 
25 mm. 
Description :—The shell is conical turreted, oblong, umbilicated; it is not quite regular 
in the whole height, but it becomes more attenuated towards the apex, so that in the upper 
part it is a little incurved; there are seven or more whorls bearing the chief character of the 
shell, two very distinct ribs, thickest in the lowest svliorl and becoming thinner towards the 
apex. Only in the lowest whorl a third rib appears. 
The ribs and spaces between are characteristically marked by the striation of growth, 
which is perfectly sinuated, and in such a manner that the lower rib, with which the whorl 
begins, and the next space are striated in a contrary way to that of the next rib and the 
following space, and so on to the apex; from this we can conclude that the emargination 
of the aperture was between the first and second ribs. 
The aperture is oblongly round. 
When we consider the measurements of the specimens, we find a spiral angle at the 
apical portion of 34°—46°, at the apertural of 17°—30°; the sutural angle 100°—108°; the 
height of specimens from 46—95 mm., height of last whorl from 16—23 mm., and 
the proportions of these to the total length from T Vb—Vos > the breadth (below) from 
25—35 mm. 
These measurements enable us to compare our specimens with forms already described, 
but to distinguish them also. 
From the measurements it follows that our species has much shorter whorls than all 
those described by Zekeli, the proportion of the last whorl to the total height being much 
smaller. 
