350 CRETACEOUS GASTROPODA 
LXXIX. TEINOSTOMA, JZ. and A. Adams, 1853. 
1. TEINOSTOMA CRETACEUM, ad’ Orbigny, sp. Pl. XXV, Fig. 7. 
1847. Rotella cretacea, d’Orbigny, Voy. Astrolabe, Paléont, Pl. IV, Figs. 18-21. 
1850. Pitonellus cretaceus, @Orbigny, Prod. II, p. 223. 
s 
Teinost. testa orbiculari, minima, levigata, polita; spira brevissima; ultimo 
anfractu ad peripheriam rotundate angulato ; basi convexa, callositate tenui tecta ; 
apertura obliqua, sub-quadrangulari, paulo dilatata ; labro ad marginem obtuso. 
The single specimen, which we have procured, has a diameter of only about 
2 millimetres; it is quite smooth and polished, with a very short spire and a uniformly 
convex basis. The last whorl is somewhat irregularly coiled, slightly angular on 
the periphery, and there is no trace of an umbilicus perceptible. The aperture is 
sub-quadrangular, with the outer margin obtuse, and the inner slightly callous. 
The specimen obtained. by d’Orbigny from (?) Pondicherry was a little larger than 
ours, but otherwise not different. 
Locality.—Comarapolliam, in soft, yellowish sandstone; very rare. 
Formation.—Axrialoor group. 
LXXX. VITRINELLA, Adams, 1850. 
1. VITRINELLA ORBICULATA, Séoliczka, Pl. XXVIII, Fig. 16. 
Vitrin. testa orbiculata, tenwi, vitrea, anfractibus tribus, rapide crescentibus, 
sutura impressa sejunctis composita, spira depressa ; ultimo anfractu ad peripheriam 
votundato ; basi late umbilicata, haud callosa; superficie striis incrementi minu- 
tissimis notata ; apertura transversaliter ovata, marginibus tenuissimis ; labro ad 
basin late insinuato. 
Height : transverse diameter of the shell (consd. as 1:00) Ojos: 
The orbicular form of the extremely thin and transparent shell, being smooth 
and largely umbilicated and having the outer lip on the base widely insinuated, 
are characters which agree with typical species of recent Vitrinelle, from which 
the present one only differs by its somewhat larger size. The small number of 
whorls, their rapid increase and the deep suture, are important specific distinctions. 
Locality.—Verdachellum, in a brownish calcareous sandstone ; very rare. 
Formation. —Verdachellum group. . 
LI. Family,—LIOTIIDA. 
LioTun#&, H. and A. Adams, Gen. I, p. 403; Chenu, Man. I, p. 351; L10TiaD#, Gray, Guide, 
1857, p. 146. 
The animal of Ziotia is said only to differ from that of Turbo by the absence 
of lobes between the tentacles, but appendages are present on the outer side of these ; 
median head-lobes are, however, known in Cyclostrema, the animal of which rather 
