PLATE

ODONTOCHILE Hawle and Corda, 1847. Odontochile spimferum B arrande, H am a r Laghdad Formation, Devonian, Pragian, Alnif, Morocco (xl.3). This large trilobite is associated, at the lower right, with a specimen of Cheirurus (Crotalocephalina) gibbus (Beirich). Specimen whitened with magnesium oxide. (RLS id., photographed by the author, through courtesy of David C. Rilling.)

HUNTONIA Campbell, 1977. Huntonia (Huntonia) lingulifer (Ulrich and Delo), Haragan Formation, L. Devonian, Coal County, Oklahoma (x2.5). (Negative loaned through courtesy of Leon Theisen, who prepared the specimen.)

Huntonia (Huntonia) huntonensis (Ulric h and Delo), Haragan Formation, L. Devonian, Coal County, Oklahoma (xl.5). This species of Huntonia is distinguished from H. (H.) lingulifer (see preceding plate) primarily by the larger width of the anterior cranidial process, longer genal spines, and shorter pygidial spine. The outline of the pygidium is more rounded, less triangular posteriorly.

(Photographed by the author, through courtesy of Robert Carroll, who prepared the specimen.)

ODONTOCEPHALUS Conrad, 1840. Odontocephalus aegeria Hall, Onondaga Limestone, M. Devonian, Perry County, New York (x2.6). The anterior tesselation is damaged. Note the doughnut-shaped intralensar bowls near the margin of the right eye. (Photographed by the author, through courtesy of Pio Pezzi.)

Devonian Families J 0 9

Subfamily Asteropyginae Delo, 1935

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