SYNOPSIS OF GENERA. xxxiii 
1876. Bahnanites, Hall. Illustrations of Devonian Fossils. 
1876. Cryphwus, C. F. Rosmer. Lethaea palseozoica. 
1878. CrypTusus, Kayser. Abhandl. z. Specialkarte Pr. und d. Thiir. St. 
1879. Cryphwus, Lossbn. Zeitschr. der deutsch. geol. Gesellschaft. 
1881 Cryphwus, Schlubtbe. Sitzungsb. niederrh. GeselL in Bonn. 
1883. Cryphwus, Kayser. Jahrb. der Konigl. Preuss. geol. Landesanst. und Bei'gakad. 
1884. Cryphwus, Beushadsbn. Abhandl z Specialkai-te Pr. und d. Thiir. St. 
1885. Cryphwus, Zittel. Handb. d. Palseontologie. 
1886. Cryphwus, Madrer. Fauna rechtsrhein. Unterdev. 
1886. Cryphwus, Matuschka. Dachschiefer von Berleburg. 
Diagnosis. Genal angles produced into long, 
often laterally compressed and narrow spines. 
Posterior thoracic segments produced and acute. 
Pygidium with five annulations and five pairs of 
marginal lobes or spines. Terminal lobe more or 
less developed. 
Sub-genus ODONTOCEPHALUS, Conrad. 1840. 
1832. Asaphus, Eaton. Geological Text-book. 
1832. Calymene, Green. Mon. Trilob. N. America. 
1840. Odontocephalus, Conrad. Third Ann. Kept. Pal. N. Y. 
1842. Odontocephalus, Vanuxem. Geol. Kept. Third Dist. N. Y. 
1843. Odontocephalus, Hall. Geol. Rept. Fourth Dist. N. Y. 
1845. Odontocephalus, 'EiWiiRiCR. Leonhardt and Bronu’s Neues Jahrb. fiir. Min. ■ 
1861. Bahiiania, Hall. Fifteenth Rept. N. Y. State Cab Nat. Hist. 
1868. Odontocephalus, Meek and Worthen. Geol. Surv. Illinois, vol. iii. 
1876. Dalmanites, Hall. Illustrations of Devonian E'ossils. 
1885. Odontocephalus, Zittel. Handb. d. Palseontologie. 
Diagnosis. The frontal border of the cepha- 
lon bears a series of incisor-like denticulations, 
which lie in contact at their distal extremities. 
These are longest in front and become obsolete 
about half way from the anterior extremity to 
the tips of the genal spines. Pygidium usually 
with two more or less developed terminal spines. 
