OF SOUTHERN INDIA. 69 
The total number of cretaceous Przvrorourps, although beside those men- 
tioned several others will have to be excluded, would be up to the present time 
17, if the American species are actually as numerous as thirteen or fourteen. I have 
repeatedly gone over the brief descriptions and compared the figures given by Conrad 
of some of the species of Daphnella and Drillia, and they certainly appear to me 
extremely doubtful. Not to say anything of the species, scarcely one of the genera 
appear determinable with even approximate accuracy. 
1. PLEUROTOMA sUBFUSIFoRMIs, D’Orb. Pl. VI, Figs. 1 and 2. 
1831. Pleurotoma fusiforme, Sowerby, Trans. Geol. Soc., Lond. III, Pl. 39, Fig.20: (non Pl. id. Sow. 1823, 
Min. Conch. IV, Pl. 387, Fig. 1. 
1850. 5 subfusiformis, D’Orbigny, Prod. II, p. 230. 
1852. es heptagona, Zekeli, Gasterop. d. Gosau. Abhandlg. d. Geol. Reichs-A. Wien, Vol. I, pt. 1, 
; p. 91, Pl. 16, Fig. 8; non. F. heptagonus, Sow. 
1853. 35 3 Reuss, Sitzungsb. d. Akad. Wien, Vol. XI, p. 915. 
1861. Turris subfusiformis, Gabb, Proc. Am. Phil. Soc. VIII, p. 145. 
1864. Plewrotoma ms Pictet, Mat. p. 1, Pal. Suisse, 3me Ser. Foss. Ste. Croix. p. 654. 
1865. a fusiformis, Stoliczka, Sitzungsh. Akad. Wien, Vol. LIT, Rey. etc. p. 86. 
Pl. testa fusiformi, perlonga ; anfractibus, numerosis, parum convexis, ad medium 
subangulatis, supra excavatis, transversim costatis ac spiraliter striatis : costis crassis, 
nodulosis, supra evanescentibus, striis 4-5, spiralibus transeuntibus ornatis; labro 
_ paululum extenso, postice prope suturam profunde sinuoso; canali longo, recto, ad 
terminationem paululum contorto. 
Spiral angle 30°—36° ; sutural angle 7°. 
Shell very long, consisting of about ten whorls, which are much contracted at 
the upper suture and slightly angulated near the middle. Each of them is orna- 
mented with nine or ten short and thick transverse ribs, disappearing on the upper 
portion; they are crossed by four or five spiral striz. When the surface is well 
preserved, it presents numerous strive or lines of growth, which being somewhat 
elevated like undulating lamin, give it rather a rough appearance. Near the 
suture they are strongly bent inward, and accumulate on the same generally to a 
thickened margin. The last whorl including the canal is about the same length as 
the spire. The inner lip is thin and smooth, the outer somewhat produced in the 
middle; the anterior termination of the canal is a little turned. ‘ 
There are several very similar species known from the neogene and eocene 
deposits. I would notice only Pl. Lamarki, Bell., (Hoérnes, Foss. Moll. Wien. 
p. 362, Pl. 39, Figs. 4—7) and Pl. brevirostrum, Sow. (Min. Conch. IV, Pl. 387, 
Fig. 2); it is scarcely possible to give any mark of distinction from the former. 
This species was first collected in the Gosau by Sedgwick and Murchison on 
their early visit to the Alps, and was figured by Sowerby under the name P. fusiforme 
in 1831, which name has been subsequently changed by D’Orbigny. Zekeli in 
describing the Gastropoda of the Gosau formation, identified the shell with a totally 
rp 
