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A Netu Loiver Cantbriaii Fauna. — Burr. 43 
however, to call attention to the region as probably contain- 
ing fossiliferous rocks of Cambrian age. 
In the latter part of November the writer again visited the 
locality. xAgain the ledges yielded nothing. A fragment, 
however, was found, which bore a small but clearly recog- 
nizable pygidium of the genus Microdiscus. A few days later 
a careful search was made, following the clue yielded by the 
character of the material in which the Microdiscus was found. 
This resulted in the discovery of the fossiliferous beds. These 
beds occur in the darker and sandier portions of the slate. So 
far as is known they are limited to a single outcrop, (map, i), 
having a total length along the strike of some thirty feet. 
Since the discovery, the locality has been worked with some 
care, and a considerable amount of material has been col- 
lected. Up to the present time ten species have been iden- 
tified, all of them typical Lower Cambrian forms. 
The fauna includes the following, species: 
Olenellus (Holmia) broggeri Walcott. 
Olenellus broggeri Walcott, 1888. "Nature" vol. 38, p. 551, 1888. 
This species is represented by one large head, a consider- 
able number of genal spines, many fragments of pleurae, -sev- 
eral portions of the dorsal spine, the hypostomae of three in- 
dividuals, and portions of the doublures of five. A very per- 
fect small head is believed to be that of a young individual of 
this species. 
The large head is not complete, but is suflficiently perfect 
to show the characters of the form. The medial portion, in- 
cluding the glabella and the right eyelobe, is complete to the 
frontal margin. The position of the left eyelobe is barely in- 
dicated. The lateral cheeks are lacking on both sides. The 
glabella has the form peculiar to this type. It is broadest 
just behind the anterior termination of the eyelobes, and nar- 
rows rapidly nearly to a point in front. It has a maximum 
width of 16 m m. The estimated width of the whole head 
is 80 m m., while its length is 50 m m. 
The small head is, in general, much like that figured by 
Walcott, (loth Ann. Rep. U. S. G. S. PI. xcii. fig. 19) but 
