74 CRETACEOUS GASTROPODA 
about two-thirds of the total height; they are separated by a deep sutural impression. 
The upper portion of each whorl is somewhat excavated, to which follows, under 
the middle, a rounded keel ornamented with 12-15 sharpened tubercles. The 
entire surface is covered with spiral strize, which are above on the excavated portion 
and on the keel much thinner, on the last whorl broad and flattened. Where they 
are crossed by the lines of growth, they present a scaly laminated structure, if well 
preserved, otherwise the strize appear to be granulated or at least somewhat thick- 
ened at short intervals. This kind of ornamentation is exactly the same as in 
Gosavia squamosa. 
The aperture is narrow and straight. The outer lip is expanded anteriorly and 
deeply insinuated posteriorly on the keel; the lines of growth being bent in the 
same manner and the successive stages of growth producing the tubercles on the keel 
corresponding to the emargination. The inner lip is rather thickened, especially 
anteriorly, and plaited over its entire extent; the upper plaits are thin and distant, 
the anterior becoming however very thick and strong, and gradually more oblique, 
as they approach the anterior extremity, which unfortunately is not perfectly preserved 
in any of our specimens, but it could scarcely differ from that of Conus. 'There are 
generally about eight or nine plaits, the three upper ones thin, the five or six lower 
ones stronger. I have not been able to trace in the European G. squwamosa more 
than three strong plaits, but there may be some more thinner ones. Besides this, 
the European species differs by having the keel ornamented with more numerous 
and thinner tubercles, placed nearer to the upper or posterior suture, the reverse of 
which is the case in the Indian. 
Localities —West of Kullygoody, near Serdamungalum, and between Andoor 
and Veraghoor; not uncommon. 
Formation.—Trichinopoly group, but close to the boundary of the Arrialoor, with 
which the light coloured sandstones agree better in their mineralogical characters. 
VIII. Family —VOLUTIDA. 
The three groups of shells, known under the generic names of Voluta, Mitra, 
and Marginella, as introduced by Lamarck, are commonly regarded as the chicf 
representatives of this family; but there exists no little controversy on the subject 
of the classification of the forms, which ought to be admitted or excluded. 
All the shells belonging to the three genera named above have a certain solid 
structure, the surface being often totally or partially covered with a thin enamel 
coating as in the Ovprarp2 ; the spire is generally very short as compared with the 
size of the last volution; the anterior extremity is notched and occasionally produced 
into a short canal, and the inner lip is provided with columellar plaits in all stages of 
growth. 
Several families have been established, more on account of some differences 
which occur in the animals, than in the shells, although none of these seem to 
justify the necessity for such a step. The considerable difference between the animals 
