Netv Fossils from the Winnipeg Limestones. 389 



corneous or chitinous structures, of articulations, — of a 

 central virgula, as in the Graptolitidae, or of marginal 

 hydrotheca, as in the hydroids and graptolites. The 

 species may form the type of a new genus of palaeozoic 

 marine algae, for which the name Trichochondrites might 

 not be inappropriate,, and characterised by a continuous 

 frondose thallus, an extremely slender rhachis, and crowded 

 linear lateral ramifications.. 



Chondrites gractllimus. (Sp. nov.) 



Thallus frondose, continuous, pinnately partite, with a 

 slender rhachis, which is nearly a millimetre in breadth 

 about the mid-height, but narrower at and near the base 

 and apex, and. apparently flattened, with no indications of 

 a central axis or virgula. Lateral ramifications simple, 

 unbranched, narrower than the rhachis, averaging about 

 one millimetre apart, the longest about fifteen mm. in 

 length, divergent in the same plane outward and a little 

 upward, but shewing no traces of hydrothecse or cell open- 

 ings on their margins : basal attachment unknown. 



Inmost Island, Kinwow Bay, Lake Winnipeg, T. C. 

 Weston, 1884: one well defined and nearly perfect speci- 

 men, though its minute structure is not preserved. 



This specimen is so similar in general shape to some of 

 the Devonian and. Carboniferous species of Plumalina that 

 the writer has Long been under the impression that it could 

 be referred to that genus. It is also equally similar in 

 general shape to the Buthograptns laxns of Hall, from the 

 Trenton shales of Wisconsin. According to S. A. Miller, 1 

 Ptilophyton, Dawson, is a synonym of Plumalina, and the 

 writer is informed by Sir J. W. Dawson that he has 

 recently ascertained that BiUhograptiis laxus is exactly 

 congeneric with, Ptilophyton. In Hall's original descrip- 

 tion of Plumalina} the specimens described are said to 



1 North American Geology and Palaeontology,. 1S89,. p. 136. 

 2. Canadian Naturalist and Geologist, Vol,. Ill,,, p 175. 



