322 E. M. KINDLE 
Russia and Bohemia. There appear to be no authentic records of 
its occurrence in the Silurian faunas of the United States. The 
nearest equivalent of this fauna in eastern America is the, Niagara 
fauna. While none of the species collected are identical with Niagara 
species, Conchidium knighti is very closely related to C. mysius of the 
Niagaran fauna. 
The Kuiu island fauna occurs in the midst of a limestone series 
which appears to be 2,000 feet or more in thickness. Other portions 
of the series which were examined appeared to be barren. Upward 
Fic. 1.—Silurian beds at Freshwater Bay. 
these limestones seem to terminate with volcanic breccias, while 
below they pass into cherts and argillites of undetermined age. 
The later Silurian horizon does not appear to be present in the 
Kuiu Island section. It occurs at Freshwater Bay (4), where more 
than a thousand feet of gray limestones, which precede the beds carry- 
ing Devonian fossils, outcrop along the south side of Freshwater Bay. 
The appearance of the lower portion of this series is shown in the 
accompanying photograph (Fig. 1). The lower two-thirds of this 
series comprises dark-gray, thinly laminated limestones. Leper- 
ditias of an undetermined species occur abundantly in certain beds 
in the lower part of the series. A few fragments of another and 
larger crustacean, probably a Ceratiacaris, are associated with them. 
