315 



Survey, in 1891. The species seem to have been somewhat gregarious 

 in its habits when living, for upwards of twenty specimens of it are 

 exposed on the surface of a large slab of shale collected by Dr. Ami at 

 this locality, and fourteen upon that of another. It is associated with 

 numerous species of trilobites, brachiopoda, etc., most of which have been 

 described by Dr. Carl Rominger and Dr. C. D. Walcott. All the speci- 

 mens of A. Canadensis are crushed quite flat laterally and occur as 

 obscurely defined and extremely thin impressions of the body segments, 

 with the tail, the latter usually a little twisted, on each of the surfaces 

 exposed by splitting pieces of the shale. 



The generic name Anomalocaris (from chnp-uio-, unlike, — kapiz. a shrimp, 

 i.e., unlike other shrimps) is suggested by the unusual shape of the 

 uropods or ventral appendages of the body segments and the relative 

 position of the caudal spines.'' 



This description was followed by a brief discussion of the supposed 

 relations of Anomaiocaris to other genera of Phyllocarida, but it is not 

 thought necessary to reproduce this discussion here, as Professor T. Rupert 

 Jones and Dr. Henry Woodward have expressed the opinion* that 

 Anomalocaris is probably not a Phyllocarid. The affinities of this genus 

 are still uncertain. In the first volume of his Text Book of Palaeontology, 

 published in 1900, Dr. C. R. Eastman places it provisionally in the 

 Family Branchiopodidse of the Order Branchiopoda. 



B. FROM THE CAMBRO-SILURIAN ROCKS OF QUEBEC 

 AND ONTARIO. 



B. I. From the Levis formation op Quebec. 



Cybtoceras Quebecense, Whiteaves. 



Plate 35, figs. 1 and 1 a. 



Cyrtoceraa Quebecense, Whiteaves 1898. Ottawa Naturalist, vol. XII, p. 120. 



" Shell elongate conical, increasing very slowly in thickness and not 

 much curved ; dorsum slightly compressed, venter and sides rounded. 

 Siphuncle large, cylindrical,dorsal and marginal ; septa apparently rather 

 closely approximated. " 



" Length of the only specimen collected, which is imperfect at both 



ends, about seventy-five millimetres, or three inches ; thickness of the 



same about eleven mm. at the smaller end, and nearly thirty at the larger. 



" Levis limestone at Pointe Levis, opposite Quebec City : a single 



specimen, which seems to be quite distinct from all the species oi»Cyrtoceras 



* In the tenth Report of the Committee on " The Fossil Phyllopoda of the Palaeozoio 

 Rocks," in the Report of the British Association for the Advancement of Science for 1893. 



