176 



PALEOZOIC TIME. 



Besides the remains of Crustaceans, there are, at Beanharnois, in 

 Canada, and elsewhere, tracks called Protlchnites (Fig. 258), which 

 Fig. 258. Fig. 259. 



Protichnites 7-notatus (X Jg) Track of a Trilobite 



are supposed to have been made by large Crustaceans having stout 

 legs like the modern Limulus : they need further explanation. A 

 very different kind of track, also first made known by Logan (Fig. 

 259), occurs in the same Canada rocks. It is six and three-quarter 

 inches wide ; and one trail is continuous for thirteen fee,t. It was 

 probably made by the clusters of foliaceous swimming or crawling 

 organs of one of the great Trilobites. 



Characteristic Species. 



1. Acadian Epoch. 



1. Plants. 



Algae. — Several Fucoids ; also Eophyton Linnceanum (a fossil of doubtful character, 

 first described in Sweden), from near Quebec, and in the auriferous rocks of Nova. 

 Scotia. 



2. Animals. 



1. Radiates — None yet described. 



2. Mollusks a. Bryozoans. — None are known. 



b. Brachiopods. — Fig. 248, Lingulella Matthewi Hartt., St. John, N. B. ; L. f 



ib. ; Obolella transversa Htt., ib. ; 249, Discina Acadica Htt., ib. : 250, Orthis Billingsh 

 Htt., ib. 



c. Of undetermined relations. — Aspidella Terranovica B., from supposed Huronian 

 in S. E. Newfoundland. 



3. Articulates a. Worms. Scolithus f ; Arenicolites spiralis? Lovell, 



from S. E. Newfoundland, with Eophyton. 



b. Crustaceans: all thus far known are Trilobites. — Fig 252, Conocoryphe (Cono- 

 cephalites) Matthewi Htt., besides 14 other species of the genus, from St. John, N. B. ; 

 253, Agnostus Acadicus Htt., and also another species, ib. ; Paradoxides lamellatus 

 Htt., with four other species, from St. John: P. Bennettii Salter, St. Mary's Bay, 

 Newfoundland; 251, Paradoxides Harlani Green, Braintree, Mass.; Bathyurus grega- 

 rius B., St. Mary's Bay, Newf. 



2. Potsdam Epoch. 



Some of the Vermont fossils of this epoch are identical with those from Anse ail 

 Loup, on the north shore of the Straits of Belle Isle, Newfoundland. 



