ECTILLAENUS SALTER, 1867. Ectillaenus perovalis (Murchison), M. Ordovician, Cefu-Maen, Llewyd Farm, S Wales (x8.3). External impression, whitened with magnesium oxide. (RLS coll. gift by Robert J. Kennedy)

Family Cheiruridae Salter, 1864 PLATE 149

Subfamily Cheirurinae Salter, 1864

CERAURUS Green, 1832. Ceraurus pleurexanthemus Green, M. Ordovician, Bobcaygeon Formation, Carden, Ontario, Canada (x2.3). (Photographed by the author through courtesy of Dave Douglass.)

Ceraurus pleurexanthemus Green, same origin as preceding plate (x2.3). Specimen whitened with magnesium oxide. (Photographed by the author, through courtesy of Pio Pezzi.)

Family Odontopleuridae Burmeister, 1843

Subfamily Selenopeltinae Hawle and Corda, 1847

SELENOPELTIS Hawle and Corda, 1847. Selenop eltis buchii (Barrande), U. Ordovician, Erfoud, Morocco (x 0.24). Detail of a spectacular assemblage of more than twenty-five complete individuals, ptepared by Flavio Bacchia. (RLS id., photogtaphed by the author, through courtesy of David C. Rilling, now at the Academy of Natural Sciences of Philadelphia.)

Family Pterygometopidae Reed, 1905

Subfamily Chasmopinae Pillet, 1954

PlATE 152

CHASMOPS M'Coy, 1849, Chasmops externa (xl. 8). Ordovician, Oslo region, Norway. (Original at Paleontologisk Museum, University of Oslo.) Cast, whitened with magnesium oxide. The prominent schizochroal eyes of this trilobite are missing in this particular specimen.

Flavio Bacchia

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