Proto, 



780 



H. S. Williams Am. J. S. [3] xxx, 1885, page 46, figs. 1-3.) 

 Mem. Nat.. Acad. Sci. 1886, p. 150, figs. 11-13.— Hall, Pal. N. 

 Y., Yol. 7, .1888, page 153, plate 27, fig. 1, a view of the belly 

 surface, from the original cast ia sandstone, {^g, 2^ omitted here. 

 a diagram of it lettered to explain the parts of this earliest 

 known '•'King-crab "); the cast is in very high relief, upon a 

 block of fine-grained, compact, olive grey. Upper Chemung 

 sandsto7ie^ from LeBoeuiF, Erie Co., Pa. If the specimen came 

 from the ZeS^ewTf quarries rock, which J. 0. White makes Third 

 Oil Sand, its age is early Catskill, or very late Chemung ; the 

 age in which so many interesting species of Eurypterids also 

 lived. See Eurypterus. — VIII-IX, 



Protonopsis horrida, Cope, Pal. Ohio, Vol. 2, 1875, page 

 363, woodcut. 



Protospongia coronata, Dawson. This and the following 



Trans. A*. S. CctnMll^fplS . 



species were first described by Dawson & Hinde in Preliminary 

 notes on new species of Fossil Sponges from Little Metis, Pro- 

 vince of Quebec, Canada, Peter Eedpath Museum, McGill 

 University, Montreal, Dawson Bros., 1888; and afterwards in 

 Sir J. William Dawson's paper on New Species of Fossil 

 Sponges from the Si] uro- Cambrian at Liftle Metis on the Lower 

 St. Lawrence, with notes by Dr. G. J. Hinde, in Trans. R. S- 

 Canada, Vol. VII, sect. 4, 1889 ; page 41, woodcut 8, restora- 

 tion of the sponge; 10, internal cavity; also, plate 3, fig. 4, ap- 

 pearance of the fossil on a piece of slate, as a mesh of needles 

 turned into pyrites, forming the skeleton of the sponge, either 

 free and held by the soft animal tissue as Prof. Sollas thinks, 

 or cemented together at their points of contact, or connected 

 by a spicular membrane as Prof. Hinde believes. The sponge 

 was anchored in the mud by larger spiculge or rods; for a re- 



