Silurian and Devonian Fossils of Canada. 423 



This species appears to be the same as that described by- 

 Edwards and Haime under the name of Streptelasma corniculum. 

 The true S. corniculum of Mr. Hall is a very different species 

 being always shorter and much curved. 



Formation and Locality. — Hudson River group. Snake Island? 

 Lake St. John. 



Collector. — J. Richardson. 



Genus Syringopora (Goldfuss.) 



Generic characters. — The fossils of this genus are fasciculated 

 or composed of large aggregations of long cylindrical corallites 

 somewhat parallel to each other and connected by numerous 

 smaller transverse tubes. The exterior walls consist of a well 

 developed solid epitheca; the cells circular; radiating septa rudi- 

 mentary ; transverse diaphragms infundibuliform or placed one 

 within another like a series of funnels. 



About twenty species of this genus are known, and these are 

 found in the Upper Silurian, Devonian and Corniferous form- 

 ations. 



Syringgpora Dalmanix (Billings). 



Description. — Forming large masses ; corallites long sub-pa- 

 rallel, slightly radiating, occasionally a little fiexuous, annulated 

 one line or rather more in diameter, distant usually half a line 

 occasionally in contact or where flexures occur, more than one 

 iine apart ; connecting processes very short, about two lines distant. 



Formation and Locality. — Upper Silurian, Head of Lake Te- 

 miscaming. 



Collector. — Sir W. E. Logan. 



Syringgpora compacta (Billings). 



Description. — Forming large hemispherical masses of straight 

 parallel or slightly diverging corallites, which are so closely 

 agregated as to compose a nearly solid mass ; about six corallites 

 in two lines. 



This species differs from all others of this genus hitherto 

 described in the eloseness of the corallites. These are so small, 

 straight and closely united that large masses broken in the longi- 

 tudinal direction of the tubes have the aspect of some species of 

 Mon ticulipora. 



Formation and Locality. — Upper Silurian. L'Anse a la 

 Vieille, Gaspe. 



Collector. — Sir W. E. Logan. 



