225 



Eris. 



Erisocrinus ? 



in Decker's creek shale under Maho- 



ning sandstone, at Morgantown, W. Va. a.nd in Fayette Co. coal 

 measures (L, 36 ; KKK, 309).— X//Z 



Erithizon cloacinum, Cope. Proc. A. P. S. 1871, p. 93, fig. 

 19, nat. size, found in the Port Kennedy cave, Chester Co., Pa. 

 Post-tertiary (Pre-glacial ? Post-glacial?). 



Escharopora recta. Hall, Pal. N. Y. Vol. 1, Trenton; 

 found by C. E. Hall, at Tyrone forges, Huntingdon Co. (00, 

 p. 232). Specimens 212-2 {a) poor fragments; 212-3 {h) frag- 

 ments in fair condition; 211-7 (a) good specimens; 211-8 

 (eleven specimens). — Trentoyi^ II c. See Appendix, 



Estheria, See Posidonia. VIII. 



Estheria ? See figures, natural size, and magniiied to show 

 sculpture, under Leperditia okeni, XI, 



Ethmophyllum minganense. Walcott. Bulletin, U. S. G. 



Uo(- S , No. 30, 



p. 77; wood 

 cut, fig. 6, 

 is a speci- 

 men of this 

 cy a th o - 

 phylloid 

 sponge fig- 

 ured by 

 Billings as 

 ArcheeoGy- 

 athusmin- 

 ganensis ; 

 figure 7, a 

 piece of 



Walcott 



the surface enlargecl to show the pores; fig. 8, the needles 

 (spiculge) enlarged fifty times. (Fig. 2, on Walcott's plate 4 

 (described page 87), is a diagrammatic vertical section through 

 the center on the line of the septa, to show the writer's view 

 of the poriferous system. If the outer wall is removed, the 

 large pores on the line of the septum would be shown as in fig. 

 1, pi. 4, and fig. 2, pi. 5. The inner wall is perforated by 

 smaller openings, and fewer of them, than the outer wall." 

 L^wer Camhrian. L. (Z 

 15 



