ARTICLE III. 
NOTES ON CAMBRIAN FAUNAS. 
By G. F. Matthew, LL.l)., F.R.S.C. 
Read 6. March 1906. 
In the Transactions of the Royal Society of Canada will be 
found a series of short articles on the Cambrian faunas, two of 
whi^h appeared in the second series, Vol. VIII, Sec. IV, page 93, 
of that publication. The following is a continuation of that 
series : 
No. 9. OSTRACODA. 
Bradorna (?) robusta. — For want of distinctive generic 
characters this species when described was referred provisionally 
to Prof. T. Rupert Jones genus Aparchites. At page 461 of th? 
article on the Cambrian Ostracoda of Gape Breton (see Can. 
Rec. Sci., Vol. VIII, No. 7) we have suggested a possible relation 
to the species falling under the genus Indiana. The following re- 
marks in this connection may be added. 
B. ( ?) robusta in iits large size is parallelled by only two of the 
known forms of the Etcheminian Ostracoda, viz. Leperditia ?? 
rugosa and Bradorna perspicator, mut. maxima. It has much of 
the general outline of the former, but is not so wide in front and 
has a shorter hinge line ; it possesses a similar marked border fold 
behind. But it is a more ventricose shell and is not wrinkled 
along the lower side of the shell. This species has a row of some- 
what distant tubercles around the ventral curve of the valve a 
little way off from the margin ; this ornamentation was not seen 
on a specimen from Hanford Brook. 
Compared with the second form noted above (mut. maxima) 
it appears more rounded at the posterior marginal slope, and has 
a less decided hinge line, this line being shorter and somewhat 
406 
Continued on Page 475. 
