40 ROYAL SOCIETY OF CANADA 



it remains, so that when the rock is weathered the fossil stands out as a 

 black object on a light gray ground, making rather a striking display. 



The tubes oï some of the sea-worms, owing to their heavy chiten, are 

 intensely black, and others that are thinner, are only faintly preserved. 

 Similar variations are seen in the condition of the Brachiopodous remains, 

 those that were calcareous are but poorly shown, but the kinds that have 

 best resisted the tooth of time are species with ehitinous and phosphatic 

 shells. 



Faintest of all the more highly organized fossils is the Phyllocarid, 

 Anomaloearis, described by Mr. Whiteavos ; it is only recognizable by a 

 somewhat shining tilm, illuminating faintly the slaty layei-s. 



UEOTHECA,^ n. gen. 



Among the few recognizable organisms of the gray shales beneath 

 the upper limestone bed of the Etchcminian at Smith Sound, are some 

 slender tapering flattened tubes which in form are like a slender Orthotheca, 

 but are of ehitinous substance. Similar forms are found in the shales of the 

 Upper Cambrian beds at Mount Stephen, in British Columbia, in which 

 the ehitinous substance is firmer, but in other respects the forms closely 

 resemble each other. I cannot find that these forms have been anywhere 

 described, and they are therefore noticed here under the above generic 

 title. 



Attenuated ehitinous tubes, beginning in a thread-like, cylindrical 

 distal end, and at one-third or half its course increasing somewhat rapidly 

 to a slowly enlarging cylindrical tube, marked by transverse growth- 

 lines, or smooth ; opening transverse, no projecting lip ; tube often 

 somewhat curved or sinuous. 



One might suppose that Torellella was synonymous with this genus, 

 but it is founded on a phc^sphatic shell, while this appears to be simply 

 ehitinous. The best preserved species, thai from Mount Stephen, in the 

 enlarged part of the tube, shows a structure similar to that of Orthotheca 

 and Hyolithes, in that the lower portion of this enlarged part is more 

 rigid than the distal portion. The long slender proximal end in which 

 the tube begins is peculiar. 



Urotheca flagellum, n. sji. (PI. 1., fig. 2.) 



Slender, gently curved ehitinous tubes. Proximal half of the tube 

 slender, sinuous and very thin ; distal half divided into two portions, of 



' The reasons for referring the succeeding genera to the Worms are given in 

 the article following this one, on the Etcheminian Fauna of Smith Sound. 

 * Oura-theke. 



