286 CRETACEOUS GASTROPODA 
the Senonien a Chem. bisulcata, which is properly speaking a Euchrysalis, is also in the same 
collection. 
We have to note from Sth. India Chemnitzia undosa, Forbes, and two other doubtful species 
belonging to the same genus, or possibly to Pseudo-Melania, [or Polyphemopsis]. 
LXI. CHEMNITZIA, D’Orbigny, 1889, (vide p. 284). 
1. CHEMNiITzia UNDOSA, Sowerby, sp. Pl. XVII, Figs. 19-21. 
1846. Chemnitzia undosa, Sow., apud Forbes in Trans. Geol. Soc., Lond., VII, p. 125, Pl. XV, Fig. 11. _ 
1847. Sealaria undata, D’Orb., Voy. Astrolabe, Paléont., Pl. ITI, Fig. 31;—idem auctorum. 
Chem. testa turrita, apice acuminata; anfractibus numerosis, planiusculis, 
transversaliter costatis, spiraliter minute striatis; costis 16-32 in uno circuitu, 
arcuatis, in basi ultimi anfractus obsoletis; apertura ovali, antice sub-effusa ; 
marginibus postice fere junctis ; labro tenwi, postice ad medium profunde insinuato ; 
labio incrassato, levigato, in terminatione columellari aliquantisper fissuram, vi« 
tectam, exhibente. 
Spiral angle 28°- 30°; sutural angle 10°- 12°. 
Height of aperture : total of shell (considered as 1:00) oe hs 0:29. 
» of one whorl : its width ( oD op) she Fe OP AlS 
Regularly grown specimens have the whorls generally flattened, except the 
last one, which being produced at the basis is convex at the periphery. The number 
of transverse ribs varies from 16-32, and is scarcely in any two specimens exactly 
the same; all the ribs are posteriorly deeply insinuated, and this alone speaks 
sufficiently against the determination of the species as a Scala, as has been done 
by D’Orbigny and accepted by subsequent writers; the ribs always disappear 
on the basis of the last whorl, generally also on the posterior portion near the 
suture, and even sometimes partially on the previous volution. The surface is 
besides entirely covered with a dense, but fine, spiral striation. 
The aperture is ovate, anteriorly effuse, posteriorly narrow, and with nearly 
united margins; the outer lip is thin, laminar, and posteriorly above the middle 
insinuated; the inner lip thick, smooth, and leaves occasionally a narrow fissure 
exposed. 
Localities —Garudamungalum, Kullygoody, Alundanapooram, Serdamunga- 
lum, Anapaudy, Andoor; very common and a characteristic fossil of the 
Formation—Trichinopoly group. 
2. CHEMNITzIA? sp. Pl. XXI, Fig. 1. 
Spiral angle 25°; sutural angle 10°. 
Approximate height of one whorl : its width (considered as 1:00) w. 0°65. 
This is a form somewhat resembling Hulima Requieniana, D’Orb. (Pal. franc. 
erét. IT, pl. 155, fig. 18), but it is less cylindrical. Neither the surface of the shell 
nor the aperture are in our specimen well preserved, and we therefore abstain from 
