PLATE

CERATONURU.S Prantl and Pribyl, 1949. Ceratonurus n. sp. Ormiston, 1968, Haragan Formation, L. Devonian, Coal County, Oklahoma (x4.1). The exposure and preservation of the long, freestanding genal spines and occipital ring spines are an outstanding feat of modern airabrasive techniques. The stalk of a bryozoan encroaches the anterior pleural spines on the right-hand side. (RLS id.; photographed by the author, through courtesy of David C. Rilling.)

DICRANURUS Conrad, 1841. Dicranurus hamatus elegantus (Campb ell), Haragan Formation, L. Devonian, Coal County, Oklahoma (x3.2). Another example of the extravagant spinosity of the Odontopleurids. (RLS id.;

photographed by the author, through couttesy of David C. Rilling.)

Dicranurus monstrosus (B arrande), Megrane Formation, Devonian, Pragian, Oulmes, Morocco (xl.7). A monstet indeed, as witnessed by the hottified exclamation on the part of my wife, who opened the box containing this specimen, kindly loaned by David C. Rilling. The specimen was prepared by Flavio

Bacchia. This black trilobite, which could not be whitened, is better pottrayed in the negative print shown, obtained from a color slide.

Another example of Dicranurus monstrosus (Barrande), same origin as preceding plate (x2.9). This individual i< partially enrolled and is shown from a viewpoint that emphasizes the retorted occipital ring spines. The specimen was prepared by Flavio Bacchia. (Photographed by the author, through courtesy of David C. Rilling.)

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