CAMBRO-SILURIAN MICRO PAL.'EONTOLOOY. 23 



Chceteicsf clailraluhis, Nicholson, Quait. Journ. Geol. Soc, Vol. XXX., p. 509, 

 pi. XXX., figs. M6, 1874. Pal. Ohio, Vol. II., p. 209, pi. 

 XXII., figs. 2-2b, 1875. Ann. Nat. Hist., ser. 4, Vol. XVIII , 

 p. 91, pi. v., fig3. 9, 9a, 1876. 



Iletcrodichja pavoniaj Ulrich, Cat. Foss. Cincinnati Group, p. 10, 1880. 



rtilodicfya pavonia, Ulrich, Journ. Cincinnati Soc. Nat. Hist., p. 1G3, 1882. 



A single cxamjilo of this beautiful form has been collected, the first 

 found in Canada. It consists of a fragment of the frond measuring about 

 G centimetres in length, about 3-5 centimetres in its greatest breadth, and 

 from 3 to 5 mm. in thickness. 



Locality and Formation, — Ottawa City. Trenton Formation. 



Collector,— '^^\i(^v E. Billings. 



Ptilodictya maculata, Ulrich. 



riilodlclya maculata, Ulrich, Journ. Cincinnati Soc. Nat. Hist , Vol. V., p 103, 

 riate VI., fig. 17, and Plato VIL, figs. 4, 4a, 1832. 



This species appears to bo not uncommon in the lower beds of the 

 Trenton Formation near Ottawa City. The largest specimen in the Survey 

 collection measures about 9 centimetres in length, and about 2-5 centi- 

 metres in its greatest breadth. 



This is doubtless the species referred to by Dr. Nicholson in his 

 description of Ptilodictya falciformis, (Pal. Ontario, p. 13, 1875), where he 

 says he has seen '* examples of what may ultimately prove to be a distinct 

 species, in which the width of the frond greatly exceeds " that of P, 

 falciformis. 



Locality and Formation. — Hull, Que., in the lower beds of the Ti-enton 

 Formation. 



Cotlectors.—W'dhov R Billings, II. M. Ami. 



Stictopora taupera, Ulrich, MS. 



Mr. Ulrich has identified this species, which is associated with Spatio- 

 pora areolata, Foord. 



Locality and Formation. — IIull, Que., in the upper beds of the Trenton 

 Formation (also in the upper Trenton Group of Burgin, Kentucky). 



Collector,— \{. Vx. Billings. 



AUTIIUONEMA TENUE, JamCS, Sp. 



Ilelopora icnvis, James, "The Palrnontologist," Cincinnati, Ohio, No. 1, p. 3, 

 July, 1878. 



