50 
SC ALA III A semicostata. 
TAB. XVI . — Middle figure . 
Spec. Char. Volutions contiguous, spire trans- 
versely striated, ribs numerous, but slightly 
raised, lower part of each volution smooth, 
naked. 
Length half an inch, greatest width three-Sixteenths. 
The ribs scarcely cover two-thirds of each volution. Vo- 
lutions about seven. 
This pretty specimen was among some of the earth ac- 
companying other shells from Barton Cliff, kindly sent me 
by the Rev. W. Bingley. I have hitherto seen only this 
one specimen. The transverse ribs terminate rather abruptly 
a little above the mouth, nearly where there generally is a 
prominent line in some of the species, especially in the next. 
SCALARIA acuta. 
TAB. XVI. — Two lower figures • 
Spec. Char. Volutions rather distant; spire with 
three slight transverse risings, and a fourth very 
prominent one, near the lower part of each turn. 
Ribs recurved, expanded, and acutely angular 
at their upper ends. 
Length eight-tenths of an inch, width four-tenths. Volu- 
tions about seven. The reflected margin of the mouth is 
extended at the upper part into a kind of short flat spine ; 
the ribs unite the volutions to each other, and form a flattish 
space on their upper part. I am glad to present another 
extraordinary novelty and rarity, by favour of Miss E. Ben- 
net, whom I have before mentioned. It is quite a new 
Scalaria from Barton Cliff. That Nature is ever treating 
us with variety and beauty is admirably exemplified in 
this production. The ribs and lowest transverse risings 
particularly distinguish it by their forms, giving a new 
contour to the whole. 
I have observed another larger specimen of this beautiful 
and singular shell in Mr. Bullock’s Museum, and there is 
a smaller one in Miss Bennet’s collection. 
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