Figs. 
. 1, 
4—bd, 
6—8, 
9—10. 
11—19, 
20—25 
26—B2. 
PLATE XVIII. 
Scata Crementina, Michelin, (var ?), p. 231, an imperfect specimen, the probable 
shape restored in outline ; Odiwm ; Ootatoor group. 
Scata suprurpinata, d’Orb., p. 232; 2, a small specimen with the margins of the 
aperture perfect; 2a, view of the basis; 2b, a small portion of the surface of the 
shell enlarged eight times; 3, 3a, 3b, respective views of another larger but less 
perfect specimen ; Arrialoor ; Arrialoor group. 
Scaxa srriatTocostata, Miller, p. 233, views of two different specimens ; 4a, showing 
the lateral compression and height of the transverse ribs; 4b, an enlarged portion 
of the surface exhibiting the spiral striation ; Comarapolliam ; Arrialoor group. 
Scata Suutanvurensis, S/o/,, p. 233, views of different specimens; 7a, being an 
enlarged portion of the surface of the shell; Skutanure ; Trichinopoly group. 
THYLACODES LAMELLOSUS, Sfo/.; p. 243 ; 9, front ; 9a, top-view of the same specimen, 
apparently full grown; 10, a fragment of a young specimen; Comarapolliam ; 
Arrialoor group. 
BurtineLLa concava, Sow. sp., p. 242; 11, section of a full grown specimen; 12, 
enlarged view of a section of the shell, showing the three distinct layers,—a, being 
the internal cavity of the whorl, b, internal layer, c, median, d, external ; 
13, 14, 15, 17, are views of the base of different specimens ; 14 and 16, top-views ; 
14a, 18, and 19, front-views, the last representing a specimen which is coiled from 
right to left, while all the other specimens in our collection are coiled from left to 
right; most of the specimens are from the sandstones between Andoor and 
Veraghoor; Arrialoor group. 
TuBULOsTIUM DiscorpEUM, Sto/., p. 240; 20, top-view of a specimen with very 
much produced aperture ; 21, the same view of another specimen; 22, front-view ; 
23, enlarged section of the shell,—a, being the internal space of the whorl, b, 
internal layer of the shell, c, median, d, external, e, external callosity ; 24, section 
of the shell ; 25, peripherical view of the same; Odiwm; Ootatoor group. 
TuBULOSTIUM CALLOsUM, Sfo/., p. 241; 26, section of a specimen ; 27, section of the 
shell,—a, being the internal space of a whorl, b, internal layer, c, median, d, external, 
e, external callosity; 28, 29, 31, front-views of different specimens; 29a and 
32, views of the base, showing the large development of the callosity ; 30 back- 
view ; WV. of Ootatoor ; Ootatoor group. 
