208 CRETACEOUS GASTROPODA 
subsequent additions, noticed in my revision of the Gosau-Gastropoda (ibid. 1865, 
Vol. LII) ; they are the following, Melanopsis, levis, punctata, and dubia ; Melania 
granulato-cincta, and Beyrichi, Zek. sp.; Tanalia acinosa, Zek. sp., and T. spiniger, 
Sow. sp. 
In a recent number of the ‘ Verhandlungen d. geol. Reichs.-Anst.’, Wien, 
1866, Vol. XVI, p. 208) appears a notice by Mr. H. V. Hantken, stating that 
cretaceous freshwater deposits, similar to those in the North-eastern Alps, have 
likewise been discovered near Ajka in Hungary (Comitate Veszprim). Besides 
several of the identical species, quoted above, five others have been found, which 
are considered by Mr. Hantken to be new. 
A WMelania (Potadoma) veterna, Meek and Hayden, is described from the cre- 
taceous rocks of Nebraska in Proc. Acad. Nat. Sc. Phil. for 1861, p. 444. 
In our deposits of South India no species of the Wzzanzzp has yet occurred. 
Tertiary species are numerous and known from all parts of the world, but the 
maximum of their development falls in the present period. 
XXII. Family —TURRITELLID 4. 
H. and A. Adams, Gen. I, p. 350; Chenu, Man. I, p. 315; Z'vrrireLLaps, Gray, Guide, 1857, 
p. 109, and others. 
Animals with the mantle-margin partially fringed or simple, but generally with 
an obsolete, anterior fold; foot short, not much expanded, roundish; operculigerous 
lobe simple; branchial plume single, consisting usually of long pectinations and 
with some mucous fillets; rostrum short, not retractile; eyes on small bulgings 
on the outer bases of lengthened, subulate tentacles; lingual membrane very narrow 
and short; teeth placed in seven series, the central being single, hooked and den- 
ticulated, the lateral narrower and with longer, angularly bent tips, but otherwise 
similarly denticulated. Operculum horny, circular, multispiral. 
Shell turreted, spiral, many-whorled, with gradual increase in thickness ; aperture 
roundish with thin margins, anteriorly often sub-effuse; the outer lip is usually 
insinuated posteriorly and somewhat produced anteriorly. 
The Tvrrirerrip are at the present time without exception inhabitants of the 
sea. In many details of their organization they resemble closely the Mrzranimpz 
as well as the Czrrruizp#, while, on the other hand, they pass into the Cacrpa# and 
Veruetips. The form of the shell approaches very much to that of the Scazrpa, 
and thus everything seems to be in favor of their classification,* as intermediate 
between the two last named families. 
* Deshayes (Anim. s. vert., Foss. bas. Paris, 2nd ed., Vol. II, p. 306) appeals to the opinion of all concho- 
logists with regard to what he views as H. and A. Adams’ unjustifiable classification of the TuRRITELLIDE 
after the Ampuzzarupz. The relations pointed out as existing between the former family and the Czcipz 
appear to Deshayes nothing more than accidents, upon which the ‘authors of the Genera’ hit!—If 
M. Deshayes had been able to consult Semper’s remarks on the genus Mathilda, his criticism also on the 
relations of the Scazi# and PyraMIDELLIDz (in part) would very likely have been less severe.—We cannot 
argue as to how far our present classification is natural, but it must be admitted, that one cannot see anything 
more unnatural between the Turrirettip# and AMPULLARIID# in H. and A. Adams’ ‘ Genera,’ than between the 
Vatvarip# and Sozaripz in Deshayes’, ‘ Paris fossils.’ 
