781 



Proto. 



markable and beautiful example of which see (under Hyalo- 

 stella metissica^ Dawson & Hinde), in the Appendix. — Found, 

 1887, at the head of Little Metis bay, south shore of the St. 

 Lawrence river, in black slates of Quebec Group {Lower Silur- 

 ian) age, II, 



Protospongia cyathiformis, Dawson. Trans. R. S. Can- 



//. ^- 



jDawson , 

 T,RSZ, 



VoLVn , jilcUre 5 , 



ada, Yol. 7, 1889, page 43* wood cut 13, a restoration of this, 

 Cambro- Silurian sponge; plate 3, fig. 6, photograph of its ap- 

 pearance on a specimen of Metis hlack slate, II, 



Protospongia delicatula, Dawson. Trans. R. S. Canada, 

 Vol. VII, sect. 4, 1889, page 43, wood cut 15 a^ restored ; J, 

 enlarged portion of the base of the sponge. For figures see 

 under P, poly nem.a- — II, 



Protospongia mononema, Dawson. Trans. R. S. Canada, 



TransM^SXan 



VII, p. 40, wood cut 5, a restoration of the sponge ; pi. 3, fig. 

 3, its aspect on a fragment of Lower Silurian slate, II. 



