472 GASTEROPODA OF THE INFERIOR OOLITE. 



Occurs sparingly in the Yorksliire Dogger. I liave also a specimen from 

 Dorset (? Broad Windsor), which might be thus referred. 



418. AcT^ONiNA (? Striact^onina) humeralis, Phillips, 1829. Plate XLII, 



tigs. 20 a, 20 i. 



1820-35. Action humeralis, PhilUps. Geo). Torks., part 1, pi. xi, fig. 34. 

 1850. AcxiEONiNA nuMERALis, d'Orhigny. Prod., i, p. 2GJ;. 



1885. — — Phillips. Hudlestou, Geol. Mag., 1885, p. 202, 



pi. V, figs. ], 1 a. 



Descri'ption (based principally on the type-specimen, which is somewhat affected 

 by mineralisation) : 



Height . . . . .15 mm. 



Body-whorl to total height . . . 71 : 100. 



Spiral angle . . . . .66°. 



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 is 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. — Actseonina 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-hQ(}i at 

 Bradford Abbas. My " MS." name for this variety is " sub -humeralis.^' This 

 passes by degrees into a distinct form. 



419. AcT^ONiNA suBovALis, sp. nov. Plate XLII, fig. 21. 



Description .• 



Height . . . . . 16 mm. 



Body-whorl to total height . . . . 65 : 100. 



Spiral angle . • . . . . 50°. 



