212 EOCENE MOLLUSCA. 
Southampton, Shenfield, Clarendon Hill, Primrose Hill, Haverstock Hill, and Alum 
Bay (No. 4, Prestwich). In the variety credrilinea, from Shenfield, the body-whorl is 
short, and rather suddenly contracted in front, and the lineation is very fine and nearly 
equal. 
No. 138. Prevurotoma crassa. Ff. #. Edwards. Tab. XXVI, fig. 1 a—d. 
P. testa elongato-Susiformi, longitudinaliter costulatd, spiraliter fasciatd ; spird elevata, 
acuminata: anfractibus convexis, antice subito coarctatis ; marginibus posticis concavis, 
concentrice granuloso-lineatis, ad suturam incrassatis, oblique plicatis ; suturis perspicuis ; 
fasciis spiralibus numerosis, plus minusve latis, crassis, cum lineis concentricis filiformibus 
alternantibus, lineis incrementi per-asperatis : apertura oblongo-oval ; labro leviter arcuato ; 
sinu lato sub-triangulari in media margine collocato ; canali antico, longo, recto. 
Shell elongate, fusiform, longitudinally ribbed, and spirally banded: spire elevated, 
being nearly as long as half the shell, and poimted: whorls many (9—11), convex, 
rather suddenly contracted, and much produced in front; the posterior margins 
hollowed out, thickened and strongly plicated by the prominent lines of growth on 
the sutural edge; the ribs rounded, moderately distant, rather oblique and short, 
not extending, even in young shells, much in front of the shoulder, and lost on the 
last whorl of the fully grown shell. Several coarsish concentric lines traverse the 
margins of the whorls, and are decussated by the lines of growth; two or three on 
the sutural edges are thicker and more elevated than the others, and from the deep 
decussation assume the appearance of a double row of coarse granulations: the bands 
over the middle and front of the whorls are more or less broad, prominent, rather 
closely set, and separated by strong, thread-like lines, the whole much roughened by 
the lines of growth: the body whorl is produced in front into a long, moderately wide, 
and nearly straight canal. The aperture is of an oblong, ovate shape; the outer lip 
arched, but not much; and the sinus, which is placed in the middle of the margin, is 
wide and subtrigonal. Occasionally specimens occur in which the shell is wider, and 
the spire not so much produced ; but in all other respects agreeing with the typical 
form. 
Size.—The large specimen figured would be, if perfect—axis, 4 inches and 3-1! 2ths; 
diameter, 1 inch and 4-12ths. 
Localities.—-Clarendon Hill, Southampton, Shenfield. 
No. 139. PLEUROoTOMA PLANETICA. F. #. Edwards. Tab. XXVI, fig. 3. 
P. testa elongato-fusiformi, sub-turritd, undique spiraliter lineata ; spird elevatd, acumi- 
