98 CRETACEOUS GASTROPODA 
successive impressed lines, so as to cause in some respect the formation of two rows 
of small tubercles. The anterior portion of the last whorl is numerously and finely 
suleated. The inner lip exhibits many oblique folds, of which the posterior 
ones are very thin and only the last anterior is considerably stronger, while in the 
living species of Lyria there are usually two stronger anterior folds. The species, 
although not rare, does not seem to attain a large size; the usual being 18mm. in 
height and 8mm. in width on the last whorl; the elongated and on both ends pointed 
form of the shell being apparently very characteristic. 
Locality —Ninnyoor in Trichinopoly district; occurrmg in whitish sandy lime- 
stone. 
Formation.—Arrialoor group. 
Oh linasaes CRASSICOSTATA, Stoliczka. Pl. IX, Fig. 9. 
Tyr. testa elongata, fusiformi ; anfractibus subconvexis, costis transversalibus 8—9 
m uno circuitu, crassis, prope rectis, in superficie spiraliter minutissime striatis ; 
ultimo spira viv altiore; apertura valde compressa ac elongata; margine interiori 
incrassato, plicoso : plicis anterioribus fortioribus, posterioribus brevioribus. 
Spiral angle about 32°; sutural angle 15°. 
This is a very peculiar species distinguished by a great thickness of the shell, 
and although known only from the imperfect specimen figured, it is so very charac- 
teristic, that even small fragments could be again recognised from this. The num- 
ber of whorls amounts to six or seven, each having 8 to 9 transverse, very thick ribs, 
extending from one suture to the other, being only slightly bent and nearly per- 
pendicular; on the last whorl, which appears to have been somewhat higher than 
the spire, they are anteriorly recurved and terminate on approaching the inner 
lip, along which there is a thick swelling, indicating the presence of a strong 
emargination of the aperture on the anterior extremity, The entire surface is 
covered with very fine spiral strize, besides which strize of growth appear more or 
less distinctly marked. The aperture is long and narrow, and according to the 
bending of the canal curved in a similar manner. The outer lip, as well as the 
anterior termination of the canal, are not perfect in our specimen, but the plication 
of the inner lip exhibits the characters of this genus pretty well; the inner margin 
being folded in its entire extent. The folds increase in thickness towards the anterior 
extremity, the second one being apparently the strongest, the first anterior some- 
what less in strength, 
Locality.— Comarapolliam (North of Arrialoor) in Trichinopoly district; out 
of conglomeratic siliceous sandstone. 
Formation.—Arrialoor group. 
