110 



the whole diameter ; the tabulae thm, much undulated, three or four in the 

 width of one line ; the outer area filled with small cells, which curve up- 

 wards and outwards, the rows leaving the inner area at an angle of 45° or 

 somewhat less, and cutting the outer surface at an angle of from 60° to 

 90°, or thereabout. There are from 120 to 150 radiating septa, most of 

 which reach the inner area. In worn specimens the surface is stongly sul- 

 cated longitudinally by the septal striae, and the transverse walls of the 

 cells which fill the intermediate spaces are seen closely crowded together, 

 there being four or five in one line. They present the pecuhar zigzag ar- 

 rangement seen in most species of Heliojyhi/Uiun. 



In size this species resembles 0. aiu/imtiim (Lonsdale), but in that spe- 

 cies the vesicular tissue forms on the surface, where seen in the interseptal 

 spaces, " regular square cells," whereas, in this, they form zigzag transverse 

 lines. 



Length, from 4 to 8 inches. Diameter of cup, from 2 to 2| inches. 



Locality and Formation. — South-west Point, Anticosti ; in Division 4, 

 Anticosti group. Middle Silurian. 



Collector. — J. Richardson. 



Cyathophtlltim Eurtone. (N. sp.) 



Description. — Turbinate, curved at the base, expandiag to a diameter 

 of one inch at the height of from one to one and a half inches, then be- 

 coming cylindrical ; radiating septa about one hundred ; cup with a fiat or 

 gently convex bottom, which is in width about half the whole diameter ; 

 inner area full half the whole width, with flat or convex tabulae ; outer 

 area with the cells ascending in lines which meet the exterior at an angle 

 of about 45° ; the vesicles acutely oval, from one to one and a half lines 

 in length, with a thickness of one-third or one half a line. Surface, in a 

 worn specimen, strongly sulcated by the septal stri«, of which there are 

 four or five in one line. 



Of this species I have seen only one specimen, of which the length is 

 3 inches, and the diameter 1 inch. 



It occurs in the same formation with 0. Anticostiense, but differs there- 

 from in the form of the cup, which has a flat bottom instead of being 

 conical ; and also in the greater diameter of the inner area. 



Locality and Formation. — The Jumpers, Anticosti ; in Division 4, An- 

 ticosti group. Middle Silurian. 



Collector. — J. Richardson. 



