OF SOUTHERN INDIA. 137 
XXXIII. LAGENA, Kleim, 1753. 
I am not acquainted with any known cretaceous species, which could be 
properly attributed to this genus; and those two noted here from the South Indian 
cretaceous deposits stand, as regards their specific characters, almost perfectly 
isolated among cretaceous fossils. 
1. Lagena nopunosa, Stoliczka. Pl. XI, Fig. 18. 
Lag. testa ovate elongata, tenui; anfractibus quinis, primis mamillatis levigatis- 
que, ceteris ad medium acute-angulatis atque nodulosis, ultimo inflato tricarimato, 
carina superiori subnodulosa, carinis duabus inferioribus sublevigatis, tenwioribus ; 
superficie spiraliter striata; apertura late angulata; labio levi, postice plicose- 
dentato ; labro extus varicoso, intus late sulcoso; canali lateraliter moderate curvo. 
Spiral angle 65°; sutural angle 10°. 
Height of last whorl including the canal : total of shell (considered as 1:00) ... w. §=0°64, 
In general form this species recalls very much Zritonidea and similar rusiyZ, 
but the large varix, which forms the outer lip of the aperture, indicates immediately 
its great relationship to other Zezronzp#. The shell consists usually of about five 
volutions, the embryonal of which are smooth and somewhat enlarged. The spire 
is only a little shorter than the height of the last volution. The posterior portion 
of the upper whorls is much contracted, either flat or somewhat excavated and 
separated from the anterior perpendicular half of the whorls by a sharp numerously 
tuberculated keel. The tubercles are depressed both above and below, and their 
number amounts on the preceding whorl to about 12; often it is rather less than 
more. On the last whorl two additional keels appear below the principal one, but 
they do not usually exhibit any tuberculation. 
The entire surface of the shell is besides covered with fine strice of growth and 
a dense spiral striation, among which generally only one line below the tuberculated 
keel predominates a little in strength. 
The aperture is much enlarged, angular with sharp raised margins, and internally 
quite smooth, with the exception of an elongated tooth on the posterior portion of 
the inner lip. The canal seems to be somewhat more elongated than usual in 
living species of this genus, and is bent slightly towards the left side (in front view). 
Localities —Near Shutanure, Veraghoor, Vylapaudy and Arrialoor, in the Trichi- 
nopoly District ; not common. 
Formations.—Trichinopoly-and Arrialoor-groups; to the latter the two last 
mentioned localities refer. The specimens from the two series of beds are all exactly 
alike, and offer no object of remark. 
2M 
