166 



F. R. Coicper Reed — Evolution of Chcirurus. 



Chcirurus 



Chcirurus 



seas, str.) Gotlandicus (Lindstrom). 



) propinqnus (Minister). 



) subulatus (Linnarsson) . 



) keisleyensia (Reed MS.). Keisley Limestone. 

 ?) gelosinosus (Portlock sp.). British only: Bala; 

 ?) Hawlei (Barrande). [Girvan ; and Ireland. 



?) conformis (Angelin). 



(« 



Group II. 



,, ) bimucronatus (Murchison sp.). 



,, ) bimucronatus var . o, bimucronatus (Salter). British 



only : Bala to Ludlow. 

 ,, ) bimucronatus var. j3, centralis (Salter). British only : 



Bala to Ludlow. 

 „ ) bimucronatus var. acanthodes (Marr and Nicholson). 



Stockdale Shales. 

 ,, ) insignis (Barrande). 



,, ) Quenstedti (Barrande). 



,, ) Quenstedti var. precursor (Freeh). 



,, ) Beyrichi (Barrande). 



,, ) brevimucronatus (Miinster). ? Ireland ; Bala. 



,, ) obtusatus (Corda). 



„ ?) cancrurus (Salter). British only: Bala. 



,, ?) bifurcatus (Barrande). 



otalocephalus) Sternbergi (Boeck). Middle Devonian, Lummaton. 



) Sternbergi var. interrupta (Kayser). 



) gibbus (Beyrich). 



) gibbus var. interrupta (Barrande). 



) pauper (Barrande). 



) my ops (Roemer). 



) articulatus (Miinster). ? British. Devonian. 



) Lenoiri (Bergerson). 



) Pengellii (Whidborne). British only. Mid. Devonian. 



) Cordai (Barrande). 



Doubtful Position. 



Cheirurus fortis (Barrande). 

 ,, vinculum (Barrande). 

 ,, radiatus (Barrande). 



Cheirurus minutus (Barrande). 

 ,, dubius (Pompecki). 

 ,, ? decacanthus (Angelin) 



The description of these new species will shortly be published. 



GENERAL SCHEME OF RELATIONSHIP OF SUB-GENERA 

 OF CHMRURUS. 



Crotalocephalus 



Pseudosphcerexochus tneirurus 



Nieszkowskia Sphcerocoryphe Cyrtometopus 



y 



Eccoptocheile 



V X 



Anacheii~urus. 



