282 CRETACEOUS GASTROPODA 
become obsolete on the last volution. The aperture is much truncated anteriorly, 
the outer lip strongly expanded in front, and the inner lip narrow, but very thick 
and elevated. 
Locality.—Ninnyoor, in soft, white limestone ; not common. 
Formation.—Arrialoor group. 
2. KEILOsTOMA SUBULATUM, Stoliczka, Pl. XX, Fig. 21. 
Keil. testa elongato-conica, aciculari ; anfractibus planiusculis, suturis impressis 
junctis, levigatis ; apertura ovate dilatata, postice angustissime canaliculata, antice 
late truncata ; labro lateraliter ac antice producto ; labio calloso, multo latiore antice 
quam postice. 
Spiral angle 28° ; sutural angle 13°5°. 
Height of aperture : totalof shell .. (considered as 1:00) a son OPAC}. 
Height of penultimate whorl : its width ( 3 sp a5) eae we 0°56. 
Shell elongated, spire very gradually pointed; whorls flat, separated by impressed 
sutures; outer lip more laterally than anteriorly expanded, and the inner lip having ~ 
anteriorly almost double the width of what it has posteriorly. These characters easily 
distinguish the species from the former. The differences between the present one 
and the next species are still more apparent, when we compare the form of the shell 
and the dimensions of the separate volutions. 
Locality.—Near Arrialoor, in yellowish, siliceous sandstone ; very rare. 
Formation.—Arrialoor group. 
3. Ketmostoma pouitum, Stoliczka, Pl. XX, Fig. 22. 
Keil. testa elongato-turrita, apice aciculata; anfractibus numerosis, subplanis, 
sutura impressa junctis, primis convexiusculis, paulo mammillatis ; omninis levigatis, 
striis minutissimis incrementi solum notatis; apertura dilatata, postice vix canali- 
culata ; labro extus postice late marginato; labio adn ato, antice lato, postice multo 
tenutore atque angustiore. 
Spiral angle 26°; sutural angle 10°. 
Height of aperture : total of shell ... (considered as 1:00) 00 eee Ojaie 
Height of penultimate whorl : its width ( a Paty) ee ODD. 
Whorls very numerous, the first somewhat mammillate and slightly convex ; the 
others almost plane, separated by a deep suture, all of them being perfectly smooth. 
The basis of the last whorl is very little produced and much truncated in front. The 
aperture is, as usual, broadly ovate, the outer lip being anteriorly expanded, and 
its exterior thickening being much broader posteriorly than anteriorly; the reverse 
is, however, the case with the inner lip, which is very thin posteriorly and on 
the whole, not nearly so much elevated and thickened, as in the two other species. 
Locality —Garudamungalum, in bluish sandstone; the species occurs not 
uncommonly with Rissoa Oldhamiana, un. sp. 
Formation.—Trichinopoly group. 
