What if! the OJenellns Fauna? — Jfatthew. 401 
beds, and it is especially abundant in the Lower Paradoxides 
beds; neither in Europe nor America do we know of it below 
this horizon, and it is so prominent a genus of this zone that 
Angelin, disregarding the Paradoxides, called the zone. Region 
of ConoGoryphes. 
Conocoryplie shows considerable subordinate variation of 
form, under which several species have been established, but 
Emmons' species, in its sharply cut glabella furrows and 
other particulars, comes nearer to C striata of the P. tessini 
sub-zone in Bohemia, and to a form from the P. dacidis sub- 
zone in Newfoundland than to the older Conocoryphes of New 
Brunswick and Sweden; thus its nearest allies are in the 
Middle Paradoxides beds. 
Another genus which occurs in the Olenellus beds of east- 
ern New York is Microdiscus. There are two forms of this 
genus in the Paradoxides beds, one Math ribbed side lobes to 
the pygidium, the other with smooth; both have long occipi- 
tal spines. The form with smooth side lobes is the later of 
the two, and belongs to the Middle Paradoxides beds. It is 
to this latter that the species (J/, connexus) which occurs in 
the New York Olenellus beds is related. 
Three species of Agnosti are reported from these beds in 
New York, which also is a link with the Paradoxides beds, as 
no Agnosti are known in Cambrian measures older than those 
which contain Paradoxides. The species described by Ford is 
of the Laevigatas section of Agnosti, which is not found lower 
down than the Middle Paradoxides beds. Walcott says this 
species is a Microdiscus; it is cei-tainly difllcult to understand 
us an Agnostus but more so as a Microdiscus. This ma^- be 
due to imperfection of the figure, or obscureness of the original 
specimen. The type is lost, and the author of the "Olenellus 
Fauna'" retains it where Ford placed it. 
The other two species of Agnosti are referred to the Fallax 
section of that genus, a section ranging upward through and 
above tlie Paradoxides beds, but not known below them. 
Another fossil which is very common in the Paradoxides 
beds and occurs also in eastern New York, is Linnarssonia 
(L. taconica). This shows ver}'^ little diiference from L. 
transversa and L. sagiftalis, the corresponding forms of the 
Paradoxides beds on the two sides of the Atlantic. 
