Notes on Cambrian Faunas. 249 
tinuous or nearly continuous eyelobe and the olenoid 
pleure. 
It differs from Olenellus by its free cheeks, from Para- 
doxides, Olenoides and Zacanthoides by its conical glabella, 
from Olenus by its continuous eyelobes, from Anomocare 
by its narrow rim and numerous thoracic segments, from 
Solenopleura by its less tumid cheeks, depressed anterior 
margin, long eyelobes and olenoid pleure, from Conoce- 
phalites (sens. strict.) by its long eyelobe, short posterior 
extension of the dorsal suture and its olenoid pleure. 
Two Acadian species (P. elegans and P. paradoxoides) of 
this genus are known and are described in Bulletin X. of 
the Natural History Society of New Brunswick. (See also 
figures 1 a-b and 2 a-d, with this paper.) 
HLLIPSOCEPHALUS (Zenker). 
This genus has long been known in Europe, but on this 
side of the Atlantic, except a broken head-shield found near 
the base of Band 6 of the St. John group, and provisionally 
referred to this genus, it has not been recognized, As 
limited by Linnarsson to its typical forms it has but a nar- 
row range in the lowest Cambrian beds. Its latest species 
appears to be H. Hoffi (Fig. 6), of Bohemia, found there 
with Paradoxides (P. Bohemicus). Another species, 1. poly- 
metopus, is found with the oldest type of Paradoxides in 
Sweden (P. @landicus), which is also the oldest type in 
Eastern Canada (P. lamellatus.) A third species (LH. 
Nordenskjoldi) is found in Europe (Norway and Sweden) 
with the Olenelloid trilobite, Holmia Kjerulfi. From these 
facts we gather that the range of the genus (sens. strict.) 
is in the top of the Olenellus zone and the lower half of 
the Paradoxides zone. The genus has not been recognized 
in America anywhere west of the Acadian region. 
ELLIPSOCEPHALUS GALEATUS, Dn. Sp. Figs. 4 a-e. 
Head shield subelliptical, with rounded corners, strongly 
vaulted, the front slope nearly at right angles with the 
posterior part of the shield. 
