ATA GASTEROPODA OF THE INFERIOR OOLITE. 
lip is thickened and drawn out obliquely, being quite smooth and rounded at the 
extremity. 
Relations and Distribution.—Acteonina glabra possesses the most stumpy 
spire of all the truly cylindro-conical Actzxonine (Cylindrobullina). In Yorkshire 
it occurs chiefly in the uppermost horizon of the Inferior Oolite. I have a 
aes in my Collection from the Dean and Chapter Pit at Lincoln (Murchisonx- 
zone) 22 mm. inheight. On the higher horizons of the Lincolnshire Limestone at 
Wansford and Weldon, and also at Barnack, smaller specimens like fig. 22, and 
still smaller ones, are by no means rare. 
421. AcTHONINA (CYLINDROBULLINA) CINEREA, Hudleston, 1885. Plate XLIII, 
figs. la, 1b. 
1885. Acrmonina cInerEA, Hudleston. Geol. Mag., 1885, p. 206, pl. v, figs. 8, 8 a. 
Description : 
Height . 5 ‘ . 10—25 mm. 
Body-wkorl to ital height . : 2 SOE MOO: 
Spiral angle : : a Ue 
Shell cylindro-conical, with a reg alee spire about one-fifth the total height. 
The angle of increase is exactly a right angle; apex obtuse. Whorls of the 
spire five, short, sub-tumid, and smooth, with a well-marked posterior tabulation or 
ledge, which is also very conspicuous on the body-whorl. Body-whorl relatively 
large and cylindrical, sides compressed. Aperture two-thirds of the total height, 
narrow with very straight outer lip, and rounded off anteriorly ; columella smooth. 
More or less flexuous growth-lines are visible on some specimens. 
Relations and Distribution.—Near to Actxeonina glabra, of which this may be 
considered a broad variety with a somewhat higher spire and more distinct 
tabulation. On the other hand, the rectangular outline of the whorls and shorter 
spire serve to separate it from Act. Scarburgensis. Not uncommon in the Sear- 
borough Limestone. 
422. AcTHONINA GIGANTEA, Deslongchamps, 1842. Plate XLIII, figs. 2 and 3, var. 
attenuata, fig. 4. 
1842. TornatTEetna eIGantTEA, Deslongchamps. Meém. Soe. Linn. Norm., vol. vii, 
p- 187, pl. x, figs. 27 and 28. 
