149 
SCALARIA frondosa. 
TAB. DLXXVII.—fig. 1. 
Spec. Cuar. Conical, elongated, costated, smooth; 
costee membranous, recurved, their upper parts 
produced into concave spines; volutions dis- 
tinct, but close, about seven. 
A very distinct and extremely beautiful shell. The 
very thin coste are very uniform; there are about twelve 
upon each whorl: it is rather a shorter shell than the 
S. acuta. 
The unique specimen figured is from Crag. It graces 
the splendid collection of the Rev. G. R. Leathes. 
—  — 
SCALARIA acuta. 
TAB. DLXXVII.—fig. 2. and TAB. XVI. 
Var. mutica: coste thick, sharp-edged, reflected, 
unequal, not produced above into a spine. 
Asouvrtan inch long and four-tenths wide. The volutions 
are ventricose, with about sixteen coste upon each. 
Collected in the London Clay in Alum Bay, Isle of 
Wight, by G. E. Smith, Esq.—It was not until the plate 
was finished that I discovered this to be only a variety. 
ee 
SCALARIA interrupta. 
TAB. DLXXVII.—/fig. 3. 
Spec. Cuar. Subulate? transversely striated, cos- 
tated, with one large varix upon each whorl ; 
cost numerous, obtuse, slightly elevated, 
united at both ends by transverse ridges ; 
whorls united, convex. 
‘Tue most remarkable character in this Scalaria is the 
union of all the ribs together by two transverse ridges, 
forming the exact resemblance to a spirally curved rope 
ladder. 
The only specimen we have seen of this consists of 
about two whorls: it is preserved by H. J. Goodhall, 
Ksq., who brought it from Barton Cliff. 
