237 



is the character mainly relied upon by Dr. Clarke to distinguish that 

 species from L. Trentonensis, but it is doubtful whether this distinction 

 between these two forms can be maintained. 



LiCHAS (CoNOLiCHAs) COENUTUS, Clarke. 



ConoUchas cornutus, Clarke 1894. Lower Silur. Trilob. Minn., p. 749, 



figs. 72 and 73. 



Lower Fort Garry (St. Andrews), Dr. R. Bell, 1880 : a well preserved 

 and characteristic though imperfect pygidium. The identification of this, 

 specimen has been corroborated by Dr. Clarke. 



Haepes. (Species undeterminable.) 



Deer Island, Lake Winnipeg, J. B. Tyrrell, 1889 : a crushed and dis- 

 torted specimen, which is too imperfect to admit of a satisfactory specific 

 determination or description. 



INCERT^ SEDIS, 



SoLENOPOEA coMPACTA, BiUings. (Sp.) 



Stroinalopora compcccti, Billings 1862. Geol. Siirv. Canada, Pal. Foss., vol. 



I., p. 55. 

 Tetradium Peachii, Nichclson and Etheridge.1877. Ann. and Mag. Nat. Hist., ser. 4, vol. 



XX., p. 166. 

 Solenopora spongioides, Dybowski 1877. Die Chtetetiden der ostbaltisoh. Silur. 



form., p. 124, taf. 2, figs. 11, a-b. 

 Teira'iiHmPmcAM', Nicholson and Etheridge.1880. Mon. Silur. Foss. Girvandistr. Ayrs., 



p. 31, pi. 1, fig. 3, and pi. 2, figs. 1, a-b. 

 Tetradium Peachii, vsLT. Canadensis, Foord . .1S83. Geol. Surv. Canada, Contr. Micro- 

 Pal. Silur. rocks, &c., p. 24, pi. 6, figs. 1, 



and ] , a-f. 

 Solenopora compacta, Nicholson and Ethe- 

 ridge 1885. Geol. Mag., Dec. 3, vol. II., p. 529, 



pi. 13, figs. 1-11. 



A few well preserved and characteristic specimens of S. compacta were 

 collected by Mr. Weston in 1884 at Big, Deer and Punk islands, at Big 

 Grindstone Point, at Washow Bay, and at Dog Head, Lake Winnipeg. 



The systematic position of this well known species, which is so abun- 

 dant in the Trenton limestone at Ottawa and other localities in eastern 

 Canada, is still an open question. Zittel, in the first volume of his 

 Handbuch der Palseontologie, published in 1883, places it, with doubt, 

 with some other genera, at the end of the Cyclostomata, in the Bryozoa ; 

 and Nicholson & Lyddeker, in the first volume of their Manual of Palae- 

 ontology, published in 1889, refer it provisionally to the Hydrozoa. 

 More recently, however, Dr. A. Brown, in a paper published in the 

 Geological Magazine for April and May, 1894, claims that it is a calcare- 



