CRUSTACEA. 55 



CO 11 V CEPHAL LIS. v s.-g. 

 Dalmanites (Corycephalus) regalis. 



PLATE XI, FIGS. 1 1. 

 Dalmanites regalis, Hail. Illustrations of Devonian Fossils, pi. xi. IS76. 



Cephalon large, outline lunate or semi-ovate; length (axial) to width as 1 to 2. 

 Border narrow and vertical in front, becoming broader on the sides, and 

 produced at the genal angles into long incurving -pirns, which equal in 

 length the axial length of the shield. The margin is ornamented by a 

 series of quadrate denticulate processes, which are short in front of the 

 glabella, but become broader ami longer on the sides. These processes 

 are somewhat constricted toward their liases, hollow and sub-cylindrical in 

 front, flattened at the sides. On the anterior margin they slope outward 

 with about the same inclination as the frontal area, but at the sides they 

 stand almost at right angles with the nearly vertical genal area, Nineteen 

 of these processes are visible upon one-half of the most perfect example, a 

 portion of those on the other half being broken away; this would make 

 thirty-eight around the entire margin of the head. 



Facial Sutures apparently normal, lying in deep sulci in their course over 

 the cheeks. 



Glabella sub-hexagonal; surface convex in front, depressed behind; widest 

 across the tips of the first pair of lobes; length and width about equal. 

 Anterior lobe large, sub-pentagonal, transverse on the anterior margin ; lateral 

 margins short and nearly parallel to the axis: postero-lateral margins rapidly 

 approximating. Surface convex, sloping almost vertically to the anterior 

 margin, more gently to the sides, and is nearly horizontal posteriorly. The 

 first lateral furrows are broad and shallow, inclined backward: the first 

 lateral lobes are elevated and nearly transverse; the second lateral fur- 

 rows are distinctly impressed at their inner extremities, becoming obsoles- 

 cent outward, giving the first and second lobes the appearance of coalescing 

 for the outer one-third of their length ; third lateral furrows narrow and 



