ACTAONINA. 475 
1851. Acrmonina Giaanrea, Deslongchamps. Morris and Lycett, Grt. Ool. 
Moll., part 1, p. 119, pl. xv, 
fig. 13. 
1885. — = — Hudleston, Geol. Mag., 1885, 
p. 203. 
1895. — — —_— Cossmann, Gast. Terr. Jur., p. 22, 
pl. ii, figs. 12, 13. 
Syn. — Destonecuampsil, d’Orbigny. Terr. Jur., vol. ii, p. 171, 
pl. eclxxxvi, fig. 11. 
Bibliography, §c.—The Normandy specimens (Bathonian) are mainly casts. 
The very large specimens from the Inferior Oolite of the Yorkshire coast are 
broader than the French types. This is one of the few species for which the 
generic name, Actxonina, is retained by M. Cossmann. 
Description.—The specimens from our Inferior Oolite are variable as to size 
and shape. ‘The Yorkshire specimen figured by Morris and Lycett has a height 
of 40 mm., whilst the specimens figured in the accompanying plate do not exceed 
25mm. The spiral angle may be said to range from 52° to 60°, whilst the body- 
whorl is generally less than two-thirds the total height. 
The shell is oval, thin, and smooth, whorls (seven or eight) rather flattened at 
the sides, sub-convex, with the posterior tabulation slightly rounded off; aperture 
narrow above, dilated below, and about three-fifths the entire length. 
Relations and Distribution.—This may be taken as an average representative 
of the genus Actxonina, closely related to the cylindro-conical forms (Cylindro- 
bullina), yet passing by protraction into such forms as Acteonina acuta, d’Orb. 
Besides the Yorkshire specimens, there are some from the Parkinsoni-zone 
of the Cotteswolds (fig. 2), which are rather short in the spire and approaching 
Act. Scarburgensis. This variety of Act. gigantea I have noticed on several 
horizons and localities of the Inferior Oolite; it is an intermediate form. 
Fig. 38 from the Dean and Chapter Pit at Lincoln (Murchisonx-zone) may be 
taken as a small but more typical representative of the species; whilst in Fig. 4 
(specimen also from Lincoln), where the spiral angle is reduced to 45°, we have 
the variety attenuata, which might almost be regarded as a distinct species. 
423, Acrmonina ovaTa, Lycett, 1850. Not figured. 
1850. Acrmonrna ovata, Lycett. Ann. Mag. Nat. Hist., 2nd ser., vol. vi, p. 41S. 
18538. -- — — Proc. Cotteswolds Nat. Club, vol. i, p. 79. 
This species is not enumerated by Morris nor by Hudleston and Wilson. 
There is one very poor specimen in the Jermyn Street Museum, from the Inferior 
