194 CRETACEOUS GASTROPODA 
3. CERITHIUM (FIBULA ?) HISPIDULUM, Stoliczka, Pl. XV, Figs. 16, 17, 18. 
Cerith. testa elongata, turrita; anfractibus regulariter in altitudine crescentibus, 
planis, postice prope suturam octonis seu denis tuberculis crassis atque acutis, et im 
tota superficie striis spiralibus granulosis ornatis, ultimis in etate provectiore postice 
sepe obsoletis ; basi ultimi anfractus, convexa, paulum producta atque spiraliter striato- 
sulcata; apertura ovali ; labio calloso, leviyato, postice plicose-dentato ; canali— ? 
Spiral angle 25°—33°; sutural angle 4°—5°. 
Height of last whorl : total of shell... ... ... (considered as 1:00) ... 0-44 
, of penultimate whorl : height of spire ( 5 aya) aaa Ue) 
6 59 9 : its width... ... ( S sue Raia) stesenna OZOH: 
This species is distinguished by its strong and spinulose tubercles on the posterior 
margin of the whorls, the entire surface of which is covered with thin granulated spiral 
strie. On the tubercles themselves these strize become often obsolete, seldom so on 
the anterior flat portion of the whorls. On the produced basis of the last volution the 
striation and intermediate sulcation is stronger than elsewhere. ‘The aperture could 
anteriorly terminate with only a short canal, but it has not been seen perfectly pre- 
served. The inner lip is thickened, smooth, with only one elongated posterior tooth, 
Localities.—S. of Serdamungalum, Kolakonuttom, and near Alundanapooram, 
all in soft ight coloured sandstones ; rather rare. 
Formation.—Trichinopoly group. 
4. CHRITHIUM LIMBATUM, Stoliczka. Pl. XV, Figs. 18-(14 ?) 
Cerith. testa elongata, turrita ; anfractibus numerosis, suturis simplicibus, in- 
terdum undulatis sejunctis, planis, spiraliter minute et granulose striatis atque via 
parte anteriort duabus liris tuberculatis ornatis : tubereulis 12-14 in wio circwitu, ob- 
tusis, spiraliter paulo elongatis, transversaliter costis obsoletis junctis, varicibus cras- 
sioribus nonnullis interpositis ; basi ultimi anfractus paulo convexa, spiraliter striata, 
ad peripheriam obsolete tuberculate-carinata; apertura rotundate quadrangulari ; 
labio levigato, postice unidentato ; canali— ? 
Spiral angle 23°; sutural angle 8°—10°. 
Approximate height of last whorl : total of shell (considered as 1:00) ... 0:15 
Height of penultimate whorl : height of spire ( Re aus) nest OZL6 
” ” 9 9g its width ( ” 009 ) eco 0:47 
A turreted subulate shell composed of a large number of flattened volutions, 
which are separated by simple, occasionally undulating, impressed sutures. The 
whole surface is covered with thin, finely granulated spiral striz, and the anterior 
two-thirds portion of each whorl is ornamented with two strongly tuberculated spiral 
ridges, each two corresponding tubercles being transversally connected by an obsoletely 
marked rib, and only at some intervals by stronger varices. The ridges and tubercles 
are originally also striated, but these strise are soon worn off, in which case they both 
