148 



the impression which is supposed to represent the body skeleton is forty- 

 five millimetres in length, and nine in its maximum height or depth. 



The specimen figured, which is the only one known to the writer, was 

 collected at Cat Head, Lake Winnipeg, by D. B. Dowling and L. M. 

 Lambe in 1890. 



OOELENTERATA. 



HYDROZOA. 



Climacogeaptus bicornis, Hall. 



Graptolithus bicornis, Hall 1847. Pal. N. York, vol. I., p. 268, pi. 73, 



figs. 2, as. 



Climacograptus bicornis, Hall 1865. Canad. Org. Rem., Dec. 2, p. 112. 



Graptolithus bicornis (Hall), Billings 1863. Geol. Canada, p. 200, fig. 193. 



Climacograptus bicornis (Hall), Miller 1889. N. Amer. Geol. and Palseont., p. 178, 



fig. 153. 



South-east side of Elk Island, Lake Winnipeg, Dr. A. R. C. Selwyn, 

 1872 : one specimen, from a loose piece of limestone. 



Thamnogeaptus appinis. (Nom. prov.) 



Pig. 10. Tha-mnograptus affinis. 

 The only specimen collected, of the natural size. 



Perhaps a var. of T. capiUaris, Hall. 



Cfr. Thamnograptus capillaris. Hall 1859. Pal. N. York, vol. III., p. 520. 



Polypary extremely thin and slender, its main axis linear and almost 

 straight, its branches simple, not perceptibly narrower than the main 

 axis, rather irregularly disposed, but apparently divergent upward and 

 outward at a very acute angle when not obviously distorted. Sicula and 

 hydrothecse unknown. 



