TEREBRATULA globata. 
TAB. CCCCXXXVI .—fig. 1. 
Spec. Char. Subglobose ; front elevated with 
two obtuse folds, and slightly produced ; 
surface often minutely punctated. 
A double sinus is formed in the lesser valve to receive 
the elevated front of the other, whose angles are obtuse ; 
in the young state, as is usual throughout the genus, the 
lolds or sinuses are less conspicuous ; the whole surface 
is minutely and elegantly punctated ; in most specimens 
the punctums are very conspicuous, but in some, whose 
surfaces have not been at all worn, they are indistinct ; 
and when the outer coat is worn away, they are seen to 
unite into undulating lines : they result from the pe- 
culiar tissue of the shell, such are often to be met 
with in other species but not generally so near to the 
surface. The lower valve is regularly convex, with 
hardly any furrows leading from the sinuses in the front ; 
the other valve has two slightly prominent ridges, that 
go a little way towards its centre. 
Rather common at Nunney, near Frome ; the Rev. J. 
Ireland has kindly supplied specimens. 
t 
TEREBRATULA perovalis. 
TAB. CCCCXXXVI.-; figs, 2 and 3. 
Spec. Char. Ovate, convex, with two elevated 
sinuses at the front, which is depressed 
between them ; beak incurved. 
T he two valves are equally convex and smooth ; the 
margin obtuse; the sinuses produce three very obtuse 
ridges, two in the upper valve, and one in the front of 
