10 SAN niEOO SOCIETY OF NATURAIi TTISTORY 



BEECHER (Charles E.)— Continued 



Compound paired e}es absent; simple eyes may occur on each fixed cheek singly 

 or in pairs. 



Including the families Agnostidae Dalman, Fam. 2, Harpeididae Barrande, Fam. 3, 

 Trinucleidae Barrande. 



The first family includes the genera Agnostus Brongniart and Microdiscus (Em- 

 mons) Salter. 



The second family, the genera Harpes, Goldfuss, Harpina Novak and Harpides 

 Beyrich. 



The third family, Trinucleus Lliwyd, Ampyx Dalman, Dionide Barrande, Endy- 

 mionia Billings, Lonchodomas Angelin, Raphiophorus Angelin and Salteria \V. 

 Thompson. 



Order B Opisthoparia. 



Free cheeks generally separate, always bearing the genal angles. 



Facial sutures extending forwards from the posterior part of the cephalon within 

 the genal angles, and cutting the anterior margin separately, or rarely uniting in front 

 of the glabella. 



Compound paired holochroal eyes on free cheeks, and well developed in all but tlie 

 most primitive families. 



Fam. 4, Conocoryphidae Angelin, including tlie genera and subgenera. 



Conocoryphe Corda Aneucanthus Ang. Atops Emmons, Avalonia W'alcott, Bailiella 

 Matthew, Bathynotus Hall, Carausia Hicks, Carmon Bar. 



Ctenocephalus Corda, Dictyocephalites Bergeron, Eryx Aug., Harttia Wale, and 

 Toxotis Wallerius. 



Family 5, Ulenidae Salter, including the genera. 



Olenus Dalm. and the following genera and subgenera, which should fall into 

 several sub-family or even family groups. 



Acerocare Ang., Acrocephalites Wallerius, Agraulus Corda, Angelina Salter. 



Anomocare Ang., Anopolenus Salter, Asaphelina Bergeron, Bavarilla Barr. 



Bergeronia Matthew, Boeckia Brogger, Ceratopyge Corda, Chariocephalus Hall. 



Corynexochus Aug., Crepicephalus Owen, Ctenopyge Linnarsson, Cyclognathus Linrs, 

 Dikelocephalus Owen (Centropleura Ang.), Dorypyge Dames. 



Elli,p«ocephalus Zenker, Elliptocephala Emmons, Euloma Ang., Eqrycare Ang., 

 Holmia Matthew, Hydrocephalus Barr. (young Paradoxides), Leptoplastus Aug., 

 Liostracus Ang., Loganella Devine, Menocephalus Owen, Mesonacis Wale, Micmacca 

 Matthew, Neseuretus Hicks, Olenelloides Peach, Olenelkis Hall, Olenoides Meek, 

 Oryctocephalus Wale, Paloeopyge Salter, Parabolina Salter, Parabolinella Brdgger, 

 Paradoxides Brong., Peltura Ang., Plutonides Hicks, Proceratopge Wallerius, Prota- 

 graulos Matthew, Protolenus Matthew, Protopeltura Brogger, Protypus Wale, 

 Pterocephalia Roemer, Ptychaspis Hall, Ptychoparia Corda, Remopleurides Portlock, 

 Sao Barr., Schmiditia Marcou, Solenopleura Aug., Sphaerothalmus Ang., Telepus Barr., 

 Triarthrella Hall, Triarthrus Green, and Zacanthoides Wale 



A number of genera have been made the types of family divisions, as Paradoxides, 

 Olenellus, Remopleurides, Ellipsocephalus, Ptychoparia, etc. 



Family 6, Asaphidae Emmrich, including the genera and subgenera. 



Asaphus Brong., Asaphellus Callaway, Asaphiscus Meek, Barrandia McCoy, Ba- 

 silicus Slater, Bathyurellus Billings, Barthyuriscus Meek, Bathyurus Bill., Bolbocephalus 

 Whitfield, Brachyaspis Salter, Bronteopsis W. Thompson, Dolichometopus Ang., 

 Gerasaphes Clarke, Holasaphus Matthew, Homalalopecten Salter, Isotelus Dekay, 

 Megalaspides Brogger, Megalaspis Ang., NIobe Ang., Og\'gia Brong., Ogygiopsis 

 Wale, Phillipsinella Novak, Platypeltis Callaway, Ptychopyge Ang. and Stygina. 



The author includes under Illaenidae the genera Illaenus Dalm., .Eglina Barr., 



