A76 GASTEROPODA OF THE INFERIOR OOLITE. 
Oolite of Gloucestershire, which may be the type. Two micromorphs from the 
Lincolnshire Limestone of Weldon seem to answer to Lycett’s diagnosis, which 
is as follows: 
“‘Ovate ; spire of moderate elevation, consisting of four flattened whorls, last 
whorl subcylindrical, large ; aperture lengthened, oblique.” 
424, Actmonina tumipuLA, Lycett, 1850. Plate XLII, fig. 5 and ? fig. 9. 
1850. Acrmonina TUMIDULA, Lycett. Ann. Mag. Nat. Hist., 2nd ser., vol. vi, 
p- 418. 
1851. — _ Morris and Lycett. Grt. Ool. Moll., part 1, p. 120, 
pl. xv, fig. 14. 
1885. — — _ Hudleston, Geol. Mag., 1885, 
p- 205, pl. v, fig. 7. 
P Syn. — Davovsrana, d’Orbigny. Terr. Jur., vol. ii, p. 169, pl. celxxxvi, 
figs. 5, 6. 
Description by Morris and Lycett.—‘* Shell small, spire depressed, volutions 
very narrow, rounded, their sutures deeply depressed ; the last whorl gibbous, 
aperture an elongated oval. This species is shorter than any other with which 
we are acquainted.” The height of the type is about 10 mm. and the spiral 
angle 100°. 
Fig. 5 represents the specimen from the Bean Collection at the British Museum, 
which is believed to be the Yorkshire type, though somewhat different to the 
figure given by Morris and Lycett. It is obviously much broken away anteriorly. 
Lycett had previously described the species from the Inferior Oolite of Gloucester- 
shire, but no specimens are forthcoming. Very rare in the Scarborough Limestone 
of White Nab. 
Fig. 9, representing a small Tvrochactzonina, may possibly be the same species 
with the anterior portion of the aperture preserved. 
425. Trocnactmonina cf. Esparcyensis, @’ Archiac, 1843. Plate XLIII, fig. 8. 
1843. Cassts Esparcyensts, d’Archiac. Mém. Soe. Géol. France, vol. v, p. 385, 
pl. xxxi, fig. 10. 
A single specimen from the Lincolnshire Limestone of Weldon, though only a 
micromorph 10 mm. in height, has considerable resemblance to this well-known 
Bathonian species. The spire is even more depressed than in Acteonina tumidula, 
whilst the body-whor] is broader atop and more pyriform in outline. 
