PLATE XVI. 



FIG. 1. Wcstonia Escasoni ; a Ventral valve ; b Interior of the same ; c Longi- 

 tudinal section of same ; d Dorsal valve ; c Interior of the same ; 

 / Longitudinal section. All Mag. f ; g Enlargement of visceral area of ven- 

 tral valve to show the central group of muscle scars ; (Legend h, Anterior 

 adductor and " k " lateral, k place of the sinew of the pedicle, I soar of the 

 "1" lateral, v Front of the visceral callus.) Mag. y 1 ; h Outer surface. 

 Mag. 2 f- ; i Sculpture of second layer of the shell. Mag. 2 I . All from 

 Band C. 3k, Escasonie shore, East bay, N. S. See p. 206. 



FIG. 2. Monobohna rcfulgcns. Interior of the ventral valve ; b Mould of interior of 

 dorsal valve. Both Mag. J. From Band C 3c, McLeod brook, Boisdale, 

 N. S. (See also PI. xi, fig. 4.) See p. 210. 



FIG. 3. Linnarssonia c.f. Belli. a Ventral valve ; b Mould of interior of same ; 

 c Mould of interior of dorsal valve. All Mag f,. From Band C 3c, McLeod 

 brook, Boisdale, N. S. See p. 209. 



FIG. 4. Beyrich-ia triceps, n. sp. a Right valve ; b Same from the front ; c Same from 

 the ventral edge. All mag. V. From band C 2b, McLean brook, Mira river, 

 N. S. Seep. 219. 



