ID IE C -A. IP O ID .A. . 

 CARIDIDJE. 



PALilOPALiEMON, Whitfield. 1880. 

 Pal^opal^mon Newberryi. 



PLATE XXX. FIGS. 20-23. 



PdUjBopalcBmon Neicberryi, Whitfield. Amer. Jour. Science, Third Series, vol six, No. 109, p. 41. 1880. 

 Unpublished plate, figs. 1-3; also Palaeontology of Ohio, pi. viii, figs. 19-21 (unpublished). 



Cephalothorax elongate and slender, tapering toward the anterior extremity ; 

 dorsum narrow ; latera narrow in front, rapidly widening behind and sloping 

 from the edges of the dorsum in nearly a vertical plane. Margin inflected 

 on the ventral side, slightly thickened and finely sulcate just within the edge, 

 on the postero-lateral area rounding in a broad forward curve to the poste- 

 rior edge, which is conspicuously reentrant. A sharp carina extends along 

 the axis of the cephalothorax and, bifurcating near the anterior extremity, 

 leaves a gently concave triangular area between its branches, which does not 

 show satisfactory evidence of having been produced into a rostrum. Each 

 branch of the axial carina connects with the anterior extremity of a dorso- 

 lateral carina, and between this and the axial carina the surface is gently 

 concave. The entire surface is ornamented by fine, elevated, venate, fre- 

 quently anastomosing lines, which are more conspicuous on the latera than 

 on the dorsum, and have a general direction upward and backward from the 

 ventral margins. From the anterior extremity on each of the latera a fine, 



