22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



Levis. Unfortunately no other identifiable fossils were recovered from 

 this bed, although trilobite fragments presumably representing Ole- 

 nellids were observed. Lower Cambrian strata are known from this 

 general area, and were designated by the writer (Rasetti, 1964) the 

 Charny formation, to avoid the confusion associated with names pre- 

 viously in use. The easternmost occurrence of identified Lower Cam- 

 brian beds in place (the Botsfordia pretiosa shale) previously reported 

 was about 20 miles northeast of Levis ; hence Mr. Hubert's finding 

 extends the known presence of Lower Cambrian strata 40 miles north- 

 east. Lower Cambrian fossils at many other localities farther east are 

 only found in boulders in Lower Ordovician conglomerates. 



It should be pointed out that the only Lower Cambrian Eodiscid 

 trilobites previously known from the Charny formation (Rasetti, 

 1945) belong to the family Pagetiidae. The same applies to the forms 

 described (Rasetti, 1948) from conglomerate boulders. However, 

 Raymond (1913) mentioned the presence of a blind Eodiscid, 

 Serrodiscus speciosus, in the boulders at Bic. The writer, who col- 

 lected thousands of Lower Cambrian trilobite specimens from that 

 and nearby localities, was unable to find this species or any other 

 blind Eodiscid. Search in the collections of the Geological Survey of 

 Canada and the U.S. National Museum failed to yield any such 

 material from the Bic locality. Hence the writer (1948) did not 

 include Serrodiscus speciosus in the list of species from the Lower 

 Cambrian of the Quebec conglomerates. 



Recently two good specimens of Serrodiscus speciosus, one cepha- 

 lon and one pygidium, bearing labels of the Bic locality and pre- 

 served in the characteristic, light-gray limestone prevailing in those 

 conglomerates, were discovered in the collections of the New York 

 State Museum. The writer was able to examine these through the 

 courtesy of Dr. Donald W. Fisher. It is thus now ascertained that 

 there are at least two blind Eodiscids in the Lower Cambrian of 

 Quebec. 



Type. — Holotype: Geological Survey of Canada No. 19887. 



Genus CALODISCUS Howell, 1935 

 T)rpe species. — Agnostus lohatus Hall. 



CALODISCUS FISSIFRONS Rasetti, new species 



Plate 9, figures 17-21 



Available material. — A few cephala, mostly fragmentary, and 

 two tentatively assigned pygidia. 



