276 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



(S.) AcTiNOSTROMA Tyrrellii, Nicholson. 



Acliiwtronia Tyrrellii, Nicholson. 1891. Ann. and Mag. Nat. Hist., vol. VII, 

 sixth series, p. 317, pi. viii, figs. 4 and 5, and wood cut, 

 fig. 1. 



Lake Winnipegosis, at five localities on the sliore and islands of the 

 southern portion of Dawson Bay, J. B. Tyrrell and D. B. Dowling, 1SS9 ; 

 apparently not uncommon and in fine condition at each of these localities. 



(S.) ACTINOSTEOMA FENESTRATUM, NicholsOn. 



Actinoxiromafenentralum, Nicholson. 1889. Mon. Brit. Stromatoporoids, Pt. II, 

 p. 146, pi. xvii, tigs. 8 and 9. 



Nicholson. 1891. Ann. and Mag. Nat. Hist., vol. VII, 

 sixth series, p. 322, pi. x, figs. 3 and 4. 



Lake Manitoba, north-west side, at Pentamerus Point, three miles and 

 a half north of the mouth of Crane Piiver, J. B. Tyrrell and J. F. Whit- 

 eaves ; several specimens. Lake Winnipegosis, on two small islands at 

 the southern end of Dawson Bay ; also on the south-western shore of 

 Dawson Bay, a little to the west of Salt Point, and at the south end of 

 Rowan Island, in the western portion of the )jay, J. B. Tyrrell, 1889 : one 

 specimen at each locality. 



ECHINODERMATA. 



CRINOIUEA. 

 (S.) Ctenocrinus. (8p.) 



Cfr. Ctrno''riNif^ fleradarfylus, {(-Joldf. sp.) G. and V. iSandl)crger. 18.50-.^t). Die Yvv- 

 steiner. des Rheinischen syst. in Nassau, p. 396, 

 pi. XXXV, fig. 1.5. 



C'fr. also, C'/awc7-inv« /ypvx, (Bronn.) Zittel. Handbuch dcr I'ula'ontologie, vol. I, 

 p. 372, fig. 260. 



Although portions of the stems of crinoids are not infrequent in the 

 Devonian rocks of Lakes Manitoba and Winnipegosis, only two specimens 

 have as yet been obtained in which any portion of the calyx or dorsal cup 

 is preserved. These were collected by Mr. Tyrrell in 1889, one on a small 

 island on the east side of Dawson Bay and the other on a small island at 

 the south end of the bay. The more perfect of these two specimens has 

 ten of the calycinal plates i)reserved and not quite two inches nf the 

 column. Each (jf these calycinal plates is hexagonal, slightly convex ex- 

 ternally, smooth in the centre, but crenulated round the margin. The 

 column is thick, averaging about se\enteen millimetres, or about three 



