SYNOPSIS OF GENERA. xxiii 



transverse frontal suture. Hypostoma small, elongate-sub-quadrate; sides 

 gently concave; posterior edge emarginate. 



Thorax composed of thirteen broad segments; axis tapering backward. 



Pygidium bearing six to eleven distinct annulations; axis regularly tapering 

 from the thorax. 



Genus HOMALONOTUS. K(enig. 1825. 



1822. Asaphus, Bronqniakt. Hist. Nat. Crust. Fossiles. 



1S2"). Homalonotus, Kcenig. [cones foss. sectiles. 



1S25. Asaphus, Deslongchamps. Men.. Sue. Linn, du Calvados. 



L828. Asaphus, Dalman. Vet. Acad. Arsberatt. 



1S32. Dipleura, T, Ireen. Monog. Trilob. X. America. 



1S35. Homalonotus, Bronn. Lethsea Geognostica. 



1S37. Trimerus, Green. Amer. Jour. Science. 



L839. Homalonotus, Emmrich. De, Trilob. Dis 



1S30. Homalonotus, Murchison. Silurian System. 



1840. Homalonotus, Milne-Edwards. Hist. Nat. Crustaces. 



1840. Homalonotus, Bronn. Leonhardt's Jahrb. fiir Min. 



1841. Homalonotus, Phillips. Palaeoz. Foss. Cornwall, Devon and Somer et. 

 1S42. Dipleura, Conrad. Jour. Acad. Nat. Sci. 



1842. Homalonotus, D'Archiac and Da Verneoil. Trans. Geol. Soc. 



1542. Dipleura, Vanoxem. Rept. Third Dist. N. Y. 



L843. Homalonotus, Dipleura, Hall. Rept. Fourth Dist. N. Y. 



1843. Dipleura, Hi ;, Goldfdss. Neues Jahrb. fur Min. 



1543. Homalonotus, Castelnau. E^s. sur le Syst. Sil. <le I'Amer. Sept. 

 1843. Homalonotus, Goldfuss. Neues Jahrb. fiir Min, 



1843. Homalonotus, F. A. Rcemer. Verstein. des Harzgeb. 



1844. Homalonotus, Sedgwick ami Murchison. Silt, palaeoz. Geb. im Norden von Deutschl. und Belgien. 



1844. Homalonotus, Eichwald. Sil. Syst. in Esthland. 

 1846. Homalonotus, Burmeister. Organ, der Trilob. 



1845. Homalonotus, Emmrich. Neues Jahrlmch fiir Min. 

 1S47. Plassiacomia, C'orda. Prodr. Monog. bohm. Trilob. 

 1S40. Homalonotus, Rouault. Bull, de la Soc. geol. de Frail 



1849. Homalonotus, Salter. Ann. and Mag. Nat. Ilist. 



1850. Homalonotus, the Brothers Sandberger. Verst. Rhein Sch. Svst. 



1850. Homalonotus, De Verneuil. Bull. Sue. geol. de France. 



1851. Homalonotus, McCoy and Sedgwick. Synopsis Brit. Pal. Fos . 



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



1852. Homalonotus, Barrande. Syst. sil. Bohfime, vol. i. 



1852. Homalonotus, V. A. Rcemer. Beitr. ii, zur Harzgeb. 



1854. Homalonotus, Wirtgen and Zeiler. Verhandl. d. Naturhist. Vereins. 

 1S55. Homalonotus, F. A. Rcemer, Beitr. iii. zur Harzgeb. 



1855. Homalonotus, Angelin. PalEeontologia Scandinavica. 



1858. Homalonotus, Hoffmann. Trilob. Russlands. 



185S. Homalonotus, BrGSBY. Quart. Jour. Geol. Soc, vol. xiv. 



1859. Homalonotus, Hall. Pal. N. Y., vol. iii. 

 1SB0. Homalonotus, Eichwald. Lethsea Rossica. 



1860. Homalonotus, Hall. Canad. Nat. and Geol. 



1862. Homalonotus, Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist. 



