ADDENDA. 107 
genus is seen in A. oliveformis, Tab, XLL, figs. 4, 4 a, which may be compared with that 
_ given in Tab. VIII, fig. 14, part 1. 
Actrontna Suxssna, Lyc. Tab. XLV, fig. 29, 
Testa ovato-elongata, spira elevata, apice acuminata anfractibus (7) angustis, subangu- 
latis, superne concavis anfractu ultimo basi attenuato ; apertura obliqua subreniformi, labro 
interno incrassato, 
Shell ovately elongated; spire elevated; apex pointed; volutions (7) narrow, convex, 
subangulated, their upper surfaces concave, their upper borders strongly impressed with 
a slightly tumid band; the last volution attenuated towards the base; the aperture 
oblique, and somewhat reniform; the inner lip conspicuous and thickened; the lines of 
growth are very conspicuous upon the spire. 
Geological Position and Localities. ‘The Forest Marble at Farleigh, Laycock, and 
Pound Pill; in the collection of W. Walton, Esq. 
Actgonrina Fascrata, Lyc. Tab. XLIV, fig. 15. 
Testa parva, ovato-elongata aut sub-cylindrica, spira magna elevata, anfractibus (7) 
angustis, superne convexis, inferne planatis, ultimo anfractu, valde elongato, apertura basi 
elliptico curvato, postice angusto ; superficie liners plicisque perpendicularibus crebris et 
‘irregularibus notatis. 
Shell small, ovately elongated or subcylindrical, the two extremities being somewhat 
pointed ; spire large, lengthened, consisting of seven narrow volutions, which have their 
upper portions inflated and their sides flattened ; the last volution is much elongated and 
sub-cylindrical ; the aperture has its anterior extremity curved elliptically, its posterior 
position narrow and lengthened ; the surface of the shell, with perpendicular, crowded, 
irregular plications and lines. 
The test is delicate, and all the specimens are more or less broken. Length of the 
largest specimen, 6 lines ; breadth, 24 lines ; length of the aperture, 4 lines. 
Geological Position and Locality. The Forest Marble of Laycock ; in the collection of 
W. Walton, Esq. 
Acrgontna Wintonensis, Lyc. Tab. XLV, fig. 25. 
Testa parva, sub-fusiformi, ovato-elongata, spira elata, anfractibus (5—6) sub-convenis, 
anfractu ultimo ovato, apertura elliptica, basi angusto ; superficie lineis perpendicularibus, 
tenuissimis, crebris notatis. 
