314 



one-third the length from the front, tapering towards both 

 • ■lids: flat, furrowed, abruptly deflected pleura; regularly 

 and evenly rounded margin of pygidium ; pustulo.se surface. 



Found in almost all the beds, from near the top of the 

 Moscow shales to the Marcellus shales (often abundant). 

 Especially common in the Trilobite beds of Section 8, on the 

 Lake Shore and in Avery's Creek. 



Gems DALMANITES. Barrande 



Sub-oenls CRYPPLEUS. Green. 



[Ety. : Krypltniis. hidden.] 

 (1837: Journ. Acad. Nat. 8ci.,Vol. VII., p. 217.) 



"Genal angles produced into long, often laterally com- 

 pressed and narrow spines. Posterior thoracic segments 

 produced and acute. Pygidium with five annulations and 

 five pairs of marginal lobes or spines. Terminal lobe more 

 or less developed." ( Hall : Pal. X. Y., Vol. VII., p. xxxiii. ) 



Cryph^es boothi. Green. (Fig. 257.) 

 (Pal. X. Y. 3 Vol. VII., p. 42, Pis. XVI., 

 XVI. A.) 



D is t ing ui's h i n g Characters. — La rge 

 cephalon, with broad, thin, blunt genal 

 spines, which normally reach the sixth 

 thoracic segment: large pear-shaped or 

 sub-pentagonal glabella ; pygidium with 

 eleven fimbriae or spines, which are stout, 

 flat and pustulose. 



Found in the lower three or four feet 

 of the Moscow shales, at Sections 4 and 

 5 (rare) ; in the Encrinal limestone at 

 Section 5 (rare); in the Lower shales of 

 Sections 5 to 8, and on the Lake Shore, 

 it is sparingly represented, occurring 

 /..!.'"'/ti 257 p'ygid^ ,lce en s usually with Phncops raua; in the 



la^ed. (after Hall and Trilobite be(]s Q f Section 8, etc., it is 



Fir;. 257. Gryphon us 

 boothi. Outline of an 

 average adult specimen 

 (after Hall and Clarke). 



