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THREBRATULA Mantize. 
TAB. CCLXXV IT.---Fig. 1: 
Spec. Cuar. Depressed, subtrigonous; with 16 
angular plaits, half of them, on one side, 
elevated ; upper valve convex. 
RNvearty an equilateral triangle, with the front rounded ; 
the beak prominent, and but slightly incurved. 
Collected in Ireland by Mrs. Mant.* It appears to be 
from the Mountain Limestone. 
TEREBRATULA obliqua. 
TAB. CCUXXVIL---Fig. 2. 
Spec. CuHar. Depressed, transversely obovate, 
with 15 angular plaits, the 5 central ones 
obliquely elevated from one side ; beak pro- 
minent. 
A swat Terebratula, remarkable for the form of the 
front, on one side of which about five plaits are turned 
downwards ; then the first of the five central plaits is 
suddenly elevated considerably, the next rather less, and 
so on less and less, until the last is scarcely higher than 
the remaining lateral ones, which are not quite so low 
as those on the other side. 
Found in the Chalk at Ramsgate. 
TEREBRATULA inconstans. 
TAB. CCLXXVITI.---Figs. 3 and A. 
Spec. Car. Globose, with about 26 angular 
plaits, half of them, on one side, elevated ; 
beak incurved. 
A remarxapty globose shell when full grown, one half 
of the edge is turned up, the other down, bat indifferently 
* The scientific Lady of the Rey. Dr. Mant, Lord Bishop of Killaloe. 
