SYNOPSIS OF GENERA. 



xli 



Sub-genus D I C R A NOG M U S , Cord a. 1847 



1846. LicTias (partim), Barrandb. Notice prelim, sur le Syst. sil. Boheme. 



1 s-47. Dicratwgmus, Corda. Prodrom M lt. bohm. Tr 



is">2. Lichas (partim), Barrandk. Syst. Sil. Boheme, vol. i. 



1S7S. Lichas (partim), Angelin. Palreontologia Scandinavica. 



Diagnosis. Dorsal furrows of the glabella 

 parallel, becoming obsolete toward the anterior 

 margin. Second lateral furrows transverse ; 

 second lateral lobes smaller than the first ; 

 third lateral lobes inconspicuous or obsolete 

 Palpebral furrows not conspicuous. 



Family, Pkoktidk. 

 Genus PROETUS, Steininger. 1831. 



1S26. Calymene, Dai.man. Deber PaUeaden. 



1829. Calymene, Holl. Handb. der Peti-efakten. 



1831. Proetus, Steininger. Mem. Soc. g6oI. de Finance. 



1832. Calymene, Goldfuss. Dechen's Handb. 'I. Geognosie. 

 1832. Calymene. Green. Mon. Trilob. North America. 

 is:!7. Calymene, Hisinger. Lethffia Suecica. 



1837. Calymene, Quenstedt. Wiegniann Archiv. 



183S. Calymene, Green. Amer. Jour. Science. 



L839. Calymene, Conrad. Second Ann. Rept. Pal. N. V. 



1839. Asaphus, Mdrchison, Silurian System. 



1839. Asaph ns. Emmrich. De Trilob. Dissert. 



L840. Calymene, Milne-Edwards. Hist. Nat. Crust, fossiles. 



1842. Calymene, D'Archiai ami De Verneuil. Trans. Geol. Soc. L leu. 



1842. Asaphus, Conrad. Jour. Acad. Nat. Sci. 



1843. Qerastos, Goldfuss. Leonhardt and Bronn's Neues Jahrb. fur Min, 



1843. Proetus, 2Eonia, Bl-rmeister. Organiz. d. Trilob. 

 1S43. Calymene, Hall. Kept. Fourth Dist. N. Y. 



1844. Cferastos, C. F. Rojmer. Rhein. Uebergangsgeb. 

 1S4.">. Cferastos, Emmrich. Neues Jahrb. fur Min. 



1845. Proetus, Loven. Ofversigt. af. Kongl. Vetensk Akad. Forhandl. 



1846. Proetus, Barraxde. Notice pr'eTim. sur Syst. Sil. Boheme. 

 1846. Proetus, Beyrich. Untersucbungen iib. Trilob. 



1546. Forbesia, McCoy. Synopsis Sil. Foss. Ireland. 

 1846. Proetus, Rouaolt. Bull. Soc. ge"ol. de France. 



1547. Proetus, Xiphogonium, Corda. Prodrom Mon. bohm r 



184S. Proetus, Phillips ami Salter. Mem. Geol. Surv. Unit. -a Kingdi m. 



1850. Trigonaspis, Cylindraspis, the Brothers Sandbergbr. Verst. 'I. Rhein. Schl Sysl 



1S50. Proetus, F. A. R<emer. Beitr i zur Harzgeb. 



1852. Proetus, Barrandb. Syst. Silur. bohm.. vol i. 



1852. Proetus, Hall. Pal. N. Y., vol. ii. 



