149 



Cat Head, Lake Winnipeg, T. 0. Weston, 1884: a single specimen 

 which is imperfect at both ends. All the branches on its right hand side 

 look as if they had been abruptly and abnormally bent backward near the 

 main axis, and then forward or forward and outward, prior to fossilization. 



With only one specimen for comparison, and that one partially distorted, 

 it is impossible to be at all certain whether this fossil is merely a local 

 variety of T. capillaris or a distinct species. As compared with Hall's 

 original figure of 1'. capillaris, the specimen from Cat Head would seem 

 to differ in the much more acutely angular divergence of its branches 

 from the main axis, and in the circumstance that these branches do not, 

 apparently, bear any short secondary branches. 



Inocaulis Canadensis. (N. Sp.) 

 Plate 17, fig. 4. 



Polypary large, thin, nearly flat or slightly undulated, widely expanded 

 and composed of very numerous narrow radiating branches, which diverge 

 or divide, reunite and anastomose in every direction, at short and frequent 

 intervals, in such a way as to form a close and finely meshed network. 

 Meshes longer than wide, varying in outline from subrhomboidal to almost 

 lanceolate, and usually pointed at one or both ends. Branches averaging 

 from about one-fifth to one-third of a millimetre in breadth, though the 

 largest are as much as two-thirds of a millimetre broad, and apparently 

 bearing on their celluliferous surface two or three longitudinal rows of 

 rounded cell apertures or pores, with intervals between thfem of about 

 twice their length or more, though the only specimen which shews this 

 feature is very imperfectly preserved. Surface markings not clearly 

 ascertainable, base of attachment and free extremities of the branches 

 unknown. 



A few large but imperfect specimens of this graptolite were collected 

 in or around Lake Winnipeg, at Inmost Island, Kinwow Bay, by T. C. 

 Weston in 1884; at Cat Head by D. B. Dowling and L. M. Lambe in 

 1890; and at Clark's Point, about eleven miles north of the Little 

 Saskatchewan, by D. B. Dowling in 1891. The largest of these specimens 

 is three inches high, nearly two inches and a half broad, and was 

 evidently much larger than this when entire. 



This species is provisionally referred to Inocaulis, Hall, because it 

 would seem to be most nearly related to the /. arbuscula of Ulrich* from 

 the Hudson River or Cincinnati group of Ohio, which is still retained in 

 that genus by Dr. Gurley in his recent paper on North American 



•Journal of the Cincinnati Society of Natural History, vol. II., 1S79, p. 28, pi. 7, 

 figs. 27 and 27a. 



