330 EOCENE MOLLUSCA. 
much arched, and is smooth within; and that the columellar folds are more oblique, 
more unequal, and not so prominent. 
Size-—Axis, 4-12ths of an inch; diameter, rather less than 2-12ths of an inch. 
Locality.—Barton, where, apparently, it is rare. 
No. 252. Borsonia tingata. fF. 2. Edwards. Tab. XXXII, fig. 14, a, 4. 
B. testa parva, ovato-fusiformi, sub-turritd, lineis spiralibus costellisque longitudinalibus 
sese decussantibus, omnino clathratad: anfractibus convexis, postice sulco concentrico pro- 
Sunde exaratis, ad suturam lineato-marginatis ; lineis spiralibus elevatis, irregularibus ; cos- 
tellis numerosis, angustis, pliciformibus, arcuatis: apertura oblongo-ovali, antice in canali 
brevi, latiusculo, exeunte ; labro sub-recto, postice profunde sinuato, intts plicifero ; colu- 
nella parum tortuosd, biplicatd. 
Shell small, ovately fusiform, sub-turreted, and ornamented with concentric lines 
and longitudinal ribs, imparting to the surface, by their decussation, the appearance 
of a fine lattice-work ; the spire is of equal length with the aperture, and is rather 
thick and pointed. The whorls, five or six without the pullus, are convex; the 
posterior margins slope very gently backwards, and are traversed by a deep, but not 
very wide, furrow, feebly crenulated; the sutural edge is bordered either by a single, 
rather thick, elevated line, sometimes granulated, or by a narrow band, formed of two 
elevated lines, separated by a shallow, but perspicuous furrow ; the longitudinal ribs, 
which are subordinate in character to the concentric lines, are not very prominent, 
but numerous, narrow, fold-like, oblique, slightly arched, and sharply defined at their 
posterior extremities by a concentric line, which borders the marginal furrow and 
gives an angulated appearance to the shoulders; in front of this are two equal, closely 
set, not very prominent lines, and to these succeed other sharp, equal, transverse 
lines, which become gradually more distant until they reach the anterior canal, over 
which the transverse lines again approach more closely. The aperture is of a rather 
narrow, oblong-oval form, and is produced in front into a short, moderately wide, canal ; 
the outer lip is nearly straight, and presents, at the posterior margin, a deep, semi- 
elliptical sinus ; the columella is slightly twisted, and bears at the middle two oblique 
and nearly equal folds. 
This well-marked species is found at Highcliff; it is somewhat rare. 
Stze.—Axis, 7-24ths of an inch; diameter, 2-12ths of an inch. 
