990 CRETACEOUS GASTROPODA 
Abhandl. Geol. Reichs-Anst. I, pt. II, p. 22, pl. 1, fig. 2, must have been taken from 
a somewhat unusually rare variety ; for I have generally found, that there is only one 
middle keel present, very like that in the 7. affinis, not two keels. I am very much 
disposed to believe, that at least the 7. nitidula and Hichwaldiana are identical with 
the last mentioned species, for the increase of the whorls is in all exactly the same; 
but I have not at present the materials to confirm this supposition. 
Localities—Near Coonum and Veraghoor; at the first in light coloured and 
bluish sandstones, and social in large numbers at the second locality. 
Formation.—Trichinopoly group. 
6. Turrrretta Neprunti, Minster, Pl. XVI, Fig. 16, and Pl. XIX, Fig. 14. 
1844.  Turritella Neptuni, Minster in Gold. Petref. Germ. III, p. 106, Pl. CXCVI, Fig. 15. 
1846 ? Neptuni, apud d’Archiac, Mem. Soe. Géol. France, Ser. II, Vol. Il, p. 344, Pl. XXYV, 
Figs. 2b and 2d, non Figs. 2 and 2c, 
Turr. testa elongata, anfractibus complanatis, ad suturam posteriorem paulo 
twmescentibus, spiraliter numerosissime striatis, striis nonnullis (3-4) fortioribus, 
ceteris tenuissimis. 
Spiral angle 20°; sutural angle 10°. 
Height of a whorl : its width (considered as 1°00) c00 ood eee 0°58. 
The surface of the whorls is covered with numerous fine spiral strive, of which 
three or four on the anterior portion are often somewhat stronger than the rest. 
Each of the whorls covers with its posterior margin asmall portion of the preceding 
one, and on account of this higher extension a narrow elevated band is formed, 
causing naturally a depression below it. This peculiar form of the whorls is by 
Minster called “ iibergreifend.’”” The ornamentation of our specimen is perfectly 
identical with that of Goldfuss’ figure, so that there can be very little doubt left of 
its being the same species. 
Miinster’s original specimens were from the middle cretaceous strata of Tour- 
nay in Belgium. D’Archiac described subsequently the fossils of this locality in 
more detail, and had apparently two different forms under examination, which he 
referred to Miinster’s species. As he, however, himself admits (vide Mem. Soe. 
Géol. France, Ser. II, Vol. II, p. 344), the specimens in figures 2b and 2d may be 
different from those represented in 2 and 2c. The former with their tumescent 
and ‘overreaching’ posterior margin and interiorly roundish section of the whorls 
appear to belong properly to Miinster’s 7. Neptuni, while to the other two figures 
d’Archiae’s first name TZ. subvibrayeana, (Bull. Soc. Géol. France, t. III, 1846, 
p. 387)=Z. Archiaci, Orb. (Prod. IT, p. 148) ought to be applied. Such a distine- 
tion appears to be at least the most probable and natural, although conclusions 
drawn from single figures, and not referring to perfect specimens, can never he 
accepted without a little hesitation. 
Locality.— Near Alundanapooram, in whitish sandstone; very rare. 
Formation.—Trichinopoly group. 
