291 



secondary spines on each side are much closer together than the four inner 

 ones and not more than one-half as long. 



" Surface markings unknown. 



" Long Point, at the north east angle of Lake Winnipegosis, just out- 

 side of the northern boundary of Manitoba, J. B. Tyrrell, 1890 : a single 

 and not very well preserved cast of the interior of the dorsal or upper 

 side, in a compact and slightly vesicular dolomite. Although the surface 

 markings are not even faintly indicated, and the characters of the glabella 

 and some of those of the central portion of the thorax are unknown, the 

 whole of the marginal outline of the specimen can be ascertained with 

 considerable accuracy. 



" In the elucidation of its characters the writer has been materially 

 assisted by Mr. L. M. Lambe. 



" The species appears to be of the type of the A. Prevostii of Barrande,* 

 from the Upper Silurian rocks (Etage E.) of Bohemia, but it has a 

 smaller number of short spines on the lateral margins of the two free 

 cheeks, a proportionately broader axis to the thorax, much longer primary 

 spines on the pygidium, and differs from that species in several other 

 particulars.'' 



D.— FROM THE LOWER SASKATCHEWAN. 

 Collected by Mr. J. B. Ttrkell in 1889 and 1890, and by Mr. 



D. B. DOWLING IN 1891. 



The rocks from which these fossils were collected are described on pages 

 144-153E of Mr. Tyrrell's Report on North-western Manitoba, etc., already 

 referred to as published by this Survey. 



ANTHOZOA. 



Tetracoralla. 



PeTRAIA (pYGM^A ? VAR.) OCCIDENTALIS. 



Plate 24, figs. 2, 3, 4 and 5. 



Cfr. PetraiM pygrtum, Billings 1862. Geol. Surv. Canada, Palseoz. Foss., 



vol. I, p. 103, fig. 91 ; and (1866) Cat. Silur. 

 Fobs. Anticosti, p. 33. 



„ Nicholson 1875. Palaeont. Ont., p. 59. 



,1 II Lambe 1900. Contr. Canad. Palieont., vol. IV, pt. 



II, p. 106, pi. 6, figs. 6, 6 a, and 6 b. 



* Syst^me Sihirien du Centre de la Boh^me, Prague et Paris, tome I, 1852, p. 739, pi. 39, 

 figs. 33-41. 

 4 



