XXXI 1 



SYNOPSIS OF GENERA. 



become necessary to place such as arc now known only from pygidia 

 other association. 



Sub-genus CORONURA, n. s -g. 



Diagnosis. Pygidium large, bearing along its 

 lateral margins a row of long, cylindrical, acute 

 and gently recurved spines. The posterior ex- 

 tremity is crescentic, its margin being smooth or 

 furnished with a row of erect spines. Annulations 

 numerous. 



in some 



Sub-genus CRYPH.1US, Green. 1837. 



I 1 -:','-'. Asaphus, Green. Monog. Trilob. N. America. 



. i sger. Mem. Soc. geol. de France. 

 1835. ( 'nhjii '■"'■ Hceninghaus. Litt. Lithograph. 

 L835. Asaphus, Leonhardt's Jahrb. f. Min. 



]^:;T. Cryph&us, Green. Amer. Jouiti. Science. 



',./'.'. Conrad. Second Aim. Rept. Pal. N. V. 

 1840. . ■ Milne-Edwards. Hist. Nat. Crust. 



1842. Oletms, D'Ari hiac ami De Verneuil. Trans. Geol. Soc. 



1843. ,: Leonhardt's Jahrb. fiir Min. 

 1843 '. Hall. Rept. Fourth nist. N. Y. 



1843. P Us, I" A. Rojmer. Verstein. d. Harzgeb. 



1844. Oh >ius, D'Archiac and De Verneuil. JElt. palseoz. Gebilde im Nord. von Deutschl. und Belgien. 

 1844. /' iiracanthus, C. F. Rcemkr. Rhein. Uebergangsgeb. 



L846. Cryphaeus, Rouault. Hull. soc. geol. de France. 



1846. Phacops, er. Organ, d. Trilobi 



1847. Asteropyge, Meta antlms, Corda. Prodrom. Mon. bohm. Tril. 



1849. CrypltOBiis, McCoy, (non <'r>i/>/,<t i>s. Green). Ann. Mag. Nat. Hist. 



1850. Pliacops, ' heirurus, V. A. Rcemer. Beitr. i. zur Harzgeb. 

 1850. CrypTiwtis, De Verneuil. Bull Soc sjeol. de France. 



Phacops, the Broi i rgi is. Rhein. Schicht. Syst. 



Cryphwus, Dk Bull. Soc. geol. de France. 



I-."l I Zeilkr. Verhandl. des Naturhistor. Vereins. 



'. Richter. Beitr. zur Palseontol. des Thuringerwaldes. 

 1861. Dalmania, Hall. i Rept. N. Y. State Cab. Nat. Hist. 



1864, /' Salt] Monog Brit. Trilobites. 



[Ac, Fischer and Dk Verneuil. In Tehihatcheff 's Asie Mineure. 

 . I-'. A. RfflMER. Beitr. v. zur Harzgeb. 

 ■. De Verneuil. Comptes rendus. 

 Ethkridge. Quart. Jour. G iol. Soc. 

 1868. /'/• uracanthus, I > v. ilque. Prodrom. d'une Descrip. geolog. de Belgique. 

 idullah. Etude geol. . ur ■ i ! phore. 



