XXXll 
SYNOPSIS OF GENERA. 
become necessary to place such as are now known only from pygidia in some 
other association. 
Sub-genus C 0 R 0 N U 11 A, 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 
furni.shed with a row of erect spines. Annulations 
numerous. 
Sub-genus CRYPHtEUS, Green. 1837. 
1832. Asagliiis, Green. Moiiog’. Trilob. N. America. 
1833. Olvnus, Steininger. Mem. Soc. geol. cle France. 
1835. Calymene, HaiNiNGHAus. Lilt, Lithogi-aph. 
1835. Amplms, Golufuss. Leonhardt’s Jalirb. f. Min. 
1837. CrypTiWtis, Green. Arnei’. Journ. Science. 
1839. Cryphceiis, Conr.ad. Second Ann. Kept. Pal. N. Y. 
1840. FleurcumitJiua, Milne-Edwards. Hist. Nat. Crust. 
1842. Oleims, D’Archiac and De Vbrneoil. Trans. Geol. Soc. 
1843. Asaphufs, Goldfuss. Leonhardt’s Jahrb. fiir Min. 
1843. Cryphwiis, Hall. Kept. Fourth Dist. N. Y. 
1843. Paradoxides, F. A. RfflMER. Verstein. d. Harzgeb. 
1844. Oleiins, D’Archiac and De Vbrneuil. Hilt, palieoz. Gebilde iin Nord. von Deutschl. und Belgien. 
1844. Pleuracanthus, C. F. Rcemer. Rhein. Uebergangsgeb. 
1846. Ct-ypliauLS, Rouault. Bull. soc. geol. de France. 
1846. Phacops, Burmeister. Organ, d. Trilobiten. 
1847. Asteropyye, Metacanthus, Corda. Prodrom. Mon. bohm. Tril. 
1849. CryphdBus, McCoy, {non Vryj^lxBua, Green). Ann. Mag. Nat. Hist. 
1850. Phacops, Chelrurns, F. A. Rcemer. Beitr. i. zur Harzgeb. 
1850. Cryphwus, De Verneuil. Bull. Soc. geol. de France. 
1850. Phacops, the Brothers Sandberger. Rhein. Schicht. Syst. 
1850. Cryphcms, De Verneuil. Bull. Soc. geol. de France. 
1854. Phacops, Wirtgen and Zeiler. Verhandl. des Naturhistor. Vereins. 
1856. Palmanla, Richter. Beiti-. zur Palseontol. des Thiiringerwaldes. 
1861. Dalmania, Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist. 
1864. Phacops {Cryphwus), Monog. Brit. Trilobites. 
1866. Cryphwus, D’Archiac, Fischer and De Verneuil. In Tchihatcheff’s Asie Mineure. 
1866. Cryphwus, F. A. Ro-jmer. Beitr. v. zur Harzgeb. 
1867. Cryphwus, De Verneuil. Comptes rendus. 
1867. Phacops, Etheridge. Quart. Jour. Geol. Soc. 
1868. PleuracanPfUS, Dbwalque. Prodrom. d’une Descrip, geolog. de Belgique. 
1ST3{^).Cryphwus, Abdullah. Ftudes geol. sur le Bosphore. 
