CANADIAN FOSSILS. 77 



Explanation of Figures. 

 Fig. Iffl. The specimen natural size. 

 16. The same enlarged. 



Locality and Formation. — City of Ottawa. Trenton limestone. 

 Collector. — E. Billings. 



II. Palasteeina eugosa, Billings. 

 Plate IX. Fig. 2a, 2b, 2c. 



(Geological Survey of Canada, Report, 1856, p. 291.) 



Description. — Two inches in diameter ; rays five, acute at their 

 apices and rapidly enlarging to a breadth of four lines at the disc, 

 which is eight lines in width. The specimen shews the upper side 

 of the fossil only ; some of the plates are absent from the centre of 

 the disc, but those which remain are very prominent in their centres, 

 and roughly ornamented with four or five deep crenulations or fur- 

 rows from near the centre to the edges, producing a star-like appear- 

 ance resembling a half-worn plate of Ghjptocrinus decadactylus ; their 

 diameter is from one to two lines. 



The rays are composed (at least the backs and sides of them,) of 

 four rows of plates, which are so very prominent that they appear to 

 be almost globular, and even pointed in their centres ; the central 

 rows are the smallest ; the first four plates of the outer row occupy 

 three lines in length, and of the inner rows nearly as many. To- 

 wards the point of the arm all diminish rapidly in size. 



Beneath the outer rows two others can be seen, which are pro- 

 bably the outer marginal plates of the under side, corresponding to 

 those of P. rigidus. 



Explanation of Fisures. Plate IX. 

 Fig. 2a. Dorsal view of a specimen. 2b. Fragment of another individual. 2c. One of 

 the plates of 2a enlarged. 



Locality and Formation. — Charleton Point, Anticosti. Hudson 

 River Group. 



Collector. — J. Richardson. 



Genus Stenastee, Billings. 



Generic Characters. — No disc ; rays linear, lanceolate or petaloid ; 

 grooves bordered by solid oblong or square adambulacral plates; 

 oral plates triangular and ten in number ; two rows of ambulacral 



