PLATE VI. 



FIG. 1. Leptobolus torrentis, n sp. Ventral valve partly exfoliate.l Mag. f from Cold- 

 brook terrane. Dugald brook, Escasonie, N. S. See p. 74. 



FIG. 2. Leptobolus atavus, a Ventral valve ; b ; Mould of interior ; d Dorsal valve ; 

 e Mould of interior ; f Another showing median and lateral septa. All Mag. 

 f ; g Portion of outer surface of the shell, Mag. \. From Assise E. 3e. Du- 

 gald brook, Escasonie, N . S. See p. 106. 



FIG. 3. Leptololus collicia. a Ventral valve ; b Dorsal valve ; c Interior of a broken 

 ventral valve. All Mag. f ; d Another ventral showing callus of visceral cavity ; 

 Mag. ; c Section of two valves, Mag. f. From Assise E. Se. Dugald brook, 

 Escasonie, N. S. See p. 112. 



FIG. 4. Leptobolus atavus, mut. insulce, n. mut. ; a Mould of interior of ventral valve ; b 

 Mould of interior of dorsal valve ; c Dorsal valve. All Mag. f . From Assise 

 " E. 2 (a?) Young Point. See p. 110. 



FIG. 5. Leptobolus atavus, mut. tritavus, n. mut ; a Ventral valve ; b Dorsal valve, 

 exfoliated at the umbo. Both Mag. f ; c A part of the surface enlarged to 

 show the sculpture, Mag. \ ; From Assise E. Id. Boundary brook Escaso- 

 nie, N. S. See p. 109. 



FIG. 6. Linyulella tumida ;a Ventral valve ; b Mould of interior ; c Longitudinal 

 section. All Mag. f ; From Assise E. 3e. Dugald brook Escasonie, N. S. 

 See p. 123. 



