380 AXNALS OF THE CaRNEGIE MuSEUM. 



Although Batliyurus anoelini, from the Chazy formation of the 

 Ottawa valley, has been included in the descriptions and lists, it is 

 not found in the typical Chazy deposits, and the so-called Chazy for- 

 mation of the Ottawa valley is related to the true Chazy in little except 

 its similar stratigraphic position. So far, only two trilobites are known 

 from those rocks : Bafhyrus a>ii:;eli>ii 2iX\<\ an undescribed Isotehis which 

 is frequently referred to under the name AsapJiiis canalis. The fauna 

 of the lower sandstones is principally molluscan, although a species 

 of Camarota'chia and an Or/his are abundant in one layer low in the 

 section, and there is a layer of Lingukc near the top. In the upper 

 or limestone member the Ostracoda predominate, accompanied by 

 several species of Mollusca and a Camarota'chia. This formation, 

 which contains very few truly Chazy species, should be distinguished 

 in some way and might take its name from the town of Aylmer, 

 Quebec, where an excellent development of the Tower Aylmer, sand- 

 stone and shale, and Upper Aylmer, limestone, is shown. 



Other formations which have a similar stratigraphic position to the 

 Chazy are the Saint Peter sandstone, part of the Stones River in cen- 

 tral Tennessee, and the limestone at Tenoirs, in east Tennessee. 



The Saint Peter has yielded Sardeson no trilobites, nor have Ulrich 

 and Bassler re])orted any as a result of their recent work in the central 

 Tennessee region. In east Tennessee the writer has collected three 

 species of trilobites at Tenoirs, which include an Isotcliis allied to 

 Isotelits liarrisi, a larger Isoteliis with a uniformly convex pygidium, 

 and an Ilhcnus, probably identical with llla-iuis glohosus. 



BIBLIOGRAPHY. 

 In this list are given all species of trilobites described from Chazy up to 1904. 

 Amphion coiiaJfiisis liillings. 



1859. Canadian Naturalist and Geologist, volume IV, page 381, figure 12a, 12b. 

 1863. Geology of Canada, page 133, figure 69. 

 1865. Paleozoic Fossils of Canada, volume i, page 28S, figure 278. 

 Arionelhis piistitlahis Walcott. 

 See Glaphnnts pustulatus. 



Asaphiis canalis Conrad. 



See te.xt on Isoteliis ha7-risi, page 343. 



AsapJuis canalis Billings. 



See text on Isoteliis harrisi, page 343. 



AsapIiHS iiiarginalis Hall. 



1847. Paleontology of New York, volume I, page 24, plate 4 bis, figure 15. 



