New Species of Sponges. 



65 



In the shales containing the above species, the only other 

 fossils observed were slender fucoids, a small Obolella and a 

 minute Cystidean or Crinoid, as foliows : — 



Obolella Ida f Billings. 

 I refer the specimens of Brachiopods found to this species, 

 which belongs to the L(6vi8 division of the Quebec Group. 

 The valves are mostly pyritized, but sometimes flattened 

 and then represented by a mere carbonaceous film. Mr. 

 Whiteaves, to whom I have shewn these shells, agrees 

 with me on their probable reference to one of Mr. Billings' 

 smaller species from the Quebec Group. 



Cystitesf 

 A small-jointed stem one centimetre in length, with an 

 elongated, flattened, oval mass at one end, in which, how- 

 ever, no distinct plates can be discovered. 



Buthotfephis per gracilis. S. N. 

 Stems very long and flexuous, about one millimetre in 

 diameter, and obscurely striate longitudinally ; sending oft' 

 at their extremities short alternate or opposite branches. 

 Allied io B. gracilis, Hall, of the Siluro-Cambrian, but 

 much more elongated and slender. These plants are 

 replaced by pyrite. 



Note on Cyathophycus reticulatus. Walcott. 

 In the collection of minerals of the late J. S. Miller, Esq., 

 of Ottawa, purchased for the University, are a few fossils, 

 some of them Canadian, others from the phosphate deposits 

 of South Carolina. Among the former are a few specimens 

 of Utica slate fossils, which, from their appearance I sup- 

 pose, have been collected in the beds of that formation near 

 Ottawa, though it is possible that some of them may have 

 been obtained from the United States. They include 

 a specimen of the above species, which Mr. Ami, who 

 has collected extensively in these beds at Ottawa, informs 

 me has not yet occurred to him. The specimen is a small 

 slab of the ordinary Utica shale, having an impression of a 



A 



