149 
SCALARIA frondosa. 
TAB. DLXXVII.— -^g. 1. 
Spec. Char. Conical, elongated, costated, smooth; 
costae 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 costae 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. DLXXVIL— /g. 2. and TAB. XVI. 
Yar. mutica : costas thick, sharp-edged, reflected, 
unequal, not produced above into a spine. 
About an inch long and four-tenths wide. The volutions 
are ventricose, with about sixteen costae 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. 
SCALARIA interrupta. 
TAB. DLXXVII.-/g. 3. 
Spec. Char. Subulate ? transversely striated, cos- 
tated, with one large varix upon each whorl ; 
costas numerous, obtuse, slightly elevated, 
united at both ends by transverse ridges ; 
whorls united, convex. 
The 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, 
Esq., who brought it from Barton Cliff. 
