NOTES ON CAMBRIAN FAUNAS 
475 
NOTES OF CAMBRIAN FAUNAS. 
Continued From Page 406. 
curved; the valve also is more ventricose 'toward the ventral and 
the posterior sides. 
These two fossils are of nearly the same size and a fuller col- 
lection of examples might show variations sufficient to unite them 
under one species. 
The Ostnacoda referred ito art: page 454 of the above named 
article as Aparchites conchiformis is identical with Bradorona 
( ?) robusta. 
This species is of larger size than those referred to the genus 
Indiana, and the valves are more angular in outline, showing a 
more decided hinge line and a somewhat triangular outline. 
Indiana (?) secunda. — This species recorded from the 
upper part of Assfse 3 of Band b (Protolenus Zone) under the 
name Aparchites sccunda, has been found also in the lower part 
of that assise and in the Cambrian sandstone of Band b on Long 
Island in Kennebecasis Bay. The species approaches a Bradorona 
in form, but is proportionately longer, and although the outline is 
too strongly angulated at the end of the cardinal line to be a 
typical Indiana, we have thought it better to place it here than in 
Bradorona. It is intermediated in form 'between Indiana lip pa 
and Bradorna obscrvator, mut. ligata. 
10. Trilobita. 
A further study of material of die Protolenus Zone enables 
me 4 o add something ito what is known of the species of 
Proitolenus. 
Protolenus p aradoxoides. — There are two var- 
ieties (perhaps sexual) of this speoies, the type (described in 
Trans. Roy. Soc. Can.) with flat narrow cheek, long glabella 
and narrow interior margin is the narrow form. The sculpture 
consists of numerous scattered tubercles. The other with tumid 
fixed cheek and broad interior margin, has a shell densely beset 
with small tubercles. 
