EXPLANATION OF THE PLATES. 
42:? 
Fig. a. Acrotreta gemmula^ x l^x 1 mm. Mag. Y; — a Ventral 
from behind ; — b Same from the side ; — c Ventral, mould 
of interior ; — d Dorsal, interior. From Protolenus Beds, 
Hanford Brook, N. B. See p. 395. 
Fig. 5. Acrotreta cf. socialis, v. Seebach 3x3x2 mm. Mag. ^ 
(except e. and k.) ; — a Ventral valve; — b Same from 
the side ; — c Mould of interior ; — d Same from the side ; 
— e Apex of the mould, mag. | ; —f Dorsal valve ; — g 
Same from the side ; — h Mould of interior ; — i Same 
from the side ; — k Enlargement of surface sculpturing, 
mag. Y- From Lingulella radula Zone, (St. John Gr : 
C.2c), McNeill Brook, Mira, N. S. See p. 392. 
Plate XVI. 
Fig. 1. Acrotreta Baileyi, 3^ x 4 x 1 mm. Mag. \ ; — a Ventral, 
mould of interior ; —b Same from the side ; — c Dorsal, 
mould of interior ; — d Same from the side. (C. 1<^) Lower 
Paradoxides Beds, King’s Co., N. B. See p. 395. 
Fig. 2. Acrotreta bisecta 3 x 3| x 3^ mm. Mag. f ; — a Ventral valve ; 
— b Mould of interior from the side ; — c Same seen from 
above ; — d Dorsal valve ; — e Mould of interior from 
behind ; — / Same from the side ; — g Same from above. 
From the Dictyonema Beds, (C. 3c) McLeod Brook, Boisdale, 
N. S, See p. 394. 
Fig. 3. Acrothele abavia n. sp., x x f mm. Mag. ^ ^ Ven- 
tral valve, interior, the umbo is filled with a plug of fine 
sand; — b Same from the side ; — c Dorsal valve, interior, 
the shell is broken away at the umbo ; — d Same from the 
side. From Assise E.3 g (Upper Etchemin.) at Dugald 
Brook, Escasonie, N. S. See p. 398, 402. 
Fig. 4. Acrothele abavia n. sp., 5^ x 6 x 1mm. Mag . \ a Ventral 
valve, interior ; — b Dorsal valve, interior. From Assise 
E.36 (Upper Etchemin.) at Dugald Brook, Escasonie, 
N. S. See p. 398. 
