314 APPENDIX. 
also other Primitia associated with the foregoing. One resem- 
bles P. ovata, J. and H. They occur more or less abundantly in 
a highly fossiliferous dark-grey limestone. 
Fig. 8 is an inside cast of a right valve, devoid of the test ; the 
main lode and the postero-dorsal angle are broken. Fig. 9 shows 
a perfect left valve; and Fig. 10, a fine right valve, still partly 
imbedded in the matrix along the dorsal edge. In the latter the 
anterior lobe is not divided into two as it usually is. 
Probably these specimens may be the same as the form de- 
scribed by Prof. James Hall and Principal Dawson as B. pustulosa, 
Hall (“ Canadian Nat. and Geol.” vol. v: p. 158, fig. 19, wood- 
cut ; and “ Acadian Geol.” 2nd edition, p. 608, tig. 216, wood- 
cut ; but I find no essential difference between the very fine 
large specimens before me and the Scandinavian specimens of 
B. tuberculata described and figured in the “ Ann. N. Hist.” ser. 
2, vol. xvi. p. 86, pl. 5, figs. 4-9. 
