OF SOUTHERN INDIA. 175 
7. Nov. gen.—Pyramidella involuta, Miller (Petref. Aach. Kreideform. IT, 
1851, p. 9, Pl. III, Fig. 10) is rightly quoted by Pictet as a doubtful species. The 
author says that it is based upon a complete specimen, although the figure does not 
show this. Jam not acquainted with any Pyramidella or Obeliscus which have the 
spiral striation or rather ribbing so distinct as this species, and if it really belongs 
to this family—for Dr. Miler does not mention any columellar plaits—it could in 
conjunction with two species, described by D’Orbigny as Nerinea Marrotiana, 
and perigordina (Pal. franc. erét. II, Pl. 168 bis.), probably be conveniently 
separated into a distinct genus. <A closely related form among living shells 
would be perhaps Fastigiella, Reeve, which has, however, a distinct recurved canal 
and a somewhat expanded outer lip, for which reason it has been transferred to the 
Creritaiip”. The forms called by A. Adams Seila are also spirally striated, but 
have no columellar plaits, and have been therefore placed in the Czrrruropsrpz. 
8. Itieria.—Matheron proposed (Bull. Soc. Geol. XTIT, p. 498) this genus for a 
species subsequently described and figured by D’Orbigny as Nerinea Cabanetiana 
(Pal. frang. terr. jur. IT, p. 99, Pl. 255, Fig. 4, and Pl. 256), and I believe the 
genus ought to be restricted to forms like this species only. The characteristics 
ean be put thus :— 
Shell ovately elongated, with longer or shorter subconical spire ; last volution ovate 
or cylindrical, anteriorly convex and posteriorly partly enveloping the previous 
whorls ; aperture prolonged, narrowly compressed, or ovoid with 1-8 Solds on the inner 
lip, and usually one fold about the middle portion of the outer lip, anteriorly with a 
narrow and slightly prolonged canal, producing a sharp edge on the termination 
of the hollow columella, and being continuous and distinctly traceable on the basis 
of the last volution. 
The surface of these shells is usually smooth or transversally ribbed. The 
columella, which appears to be invariably hollowed out, is usually provided with 
only two folds and the outer lip with one, although the latter seems to be often pre- 
sent only during a certain stage of life. We may quote a few of the principal species, 
to which we would restrict Matheron’s name; Itieria ( Nerinea) Cabanetiana, 
Moreana, fusiformis, Clymene, pupoides and Mose, described by D’Orbigny in Pal. 
franc. terr. jur. IL; Ner. tornatella, Buvignier ; perhaps the Ner. Staszycii, Zeu- 
schner, sp. (Sitzungsb. Akad. Wien, 1855, Vol. XVI, p. 350); farther the cretaceous 
species, Nerinea cyathus, Meriani, rostrata, Pictet et Campiche in Mater. Dp. i. OPale 
Suisse, ser. IIT; Wer. Bauga, D’Orb; Itieria abbreviata, Phil. sp. (Sitz. Akad. 
Wien, LIT, 1865; Revision of the Gosau Gastropoda, p. 41) and some others. 
The principal differences of this genus from Nerinea lie in the ovate form of 
the last volution and in the form of the anterior termination of the aperture. 
These two characters agree perfectly with Odeliscus, and if there were numerous 
short small folds on the inner side of the outer lip, as they are usually exhibited 
in the living Odeliscus, there would be absolutely no possibility of distinguishing 
these fossil species from the last named genus. 
