472 GASTEROPODA OF THE INFERIOR OOLITE. 
Occurs sparingly in the Yorkshire Dogger. I have also a specimen from 
Dorset (? Broad Windsor), which might be thus referred. 
418. Actzonina (? STRIACTHMONINA) HuMERALIS, Phillips, 1829. Plate XLII, 
figs. 20 a, 20 b. 
1829-35. Acrzon HUMERALIS, Phillips. Geol. Yorks., part 1, pl. xi, fig. 34. 
1850. Acrmonrna HUMERALIS, d’Orbigny. Prod., i, p. 264. 
1885. — — Phillips. Wudleston, Geol. Mag., 1885, p. 202, 
pl. v, figs. 1, 1a. 
Description (based principally on the type-specimen, which is somewhat affected 
by mineralisation) : 
Height : : : : . 15 mm. 
Body-whorl to total height : : = (100: 
Spiral angle . : 3) 1662. 
Shell cylindro-conical; the spire about three-tenths the total height, and 
composed of five whorls. In many respects the description of the preceding 
species 1s applicable to this one. Thus the whorls of the spire are flat atop and 
marked on the shoulder by a grooved line, which produces two steps, or a sort of 
double tabulation. ‘The grooving on the shoulder is very distinct in the body- 
whorl, which is perfectly cylindrical. But there are no traces of spiral striation, 
except some faint lines towards the anterior extremity. The length of the 
aperture is about two-thirds the height of the shell: it is narrow behind, wide in 
front; outer lip straight and thin, columellar lip smooth and without plications. 
Relations and Distribution—Acteonina humeralis is not uncommon in the 
Yorkshire Dogger, though good examples are scarce. Many specimens also are 
much smaller than the one figured. 
A narrow and perfectly glabrous variety occurs in the Concavus-bed at 
Bradford Abbas. My ‘‘ MS.” name for this variety is ‘ swb-humeralis.’ This 
passes by degrees into a distinct form. 
419. ACTEHONINA SUBOVALIS, sp. nov. Plate XLII, fig. 21. 
Description : 
Height ; 5 : é ~ li6amm: 
Body-whorl to total height ; : . 65:100. 
Spiral angle. : ; oe rams 
