i} WV. REPORT OK I'U(»(iUKSS. C. K. BKKOHEK. 



Oi:i)Ku PIIYLLOCARIDA, iPAcKAiii), 1879.) 



Family Ckkatiocarid^, Salter, 18(50. 

 Genus ECHINOCARIS, Whitfield, 1880. 



(^wi. Jour. Sci., Vol. XIX, p. S4, 1880.) 



ECIIINOCARIS punctata, 

 Plate I, Figs. 13-16. 



Ceratxocaris ? punctntus, Hall. Sixteenth Rep. N. Y. State Cab. Nat. Hist, 

 p. 74. 1863 



Ceratiocaris armatus, Hall. Sixteenth Rep. N. Y. State Cab. Nat. Hist., 

 p. 72. 1863. 



Ceratiocaris a7-matits, liAX.!^. Illustrations of Devonian Fossils. Explana- 

 tion of PI. 23, Figs. 4, 5. 1876. 



Ceratiocaris {Aristozoe,) punctatus, Hall. Illustrations of Devonian Fos- 

 sils. Ex pi. Plate 23, Fig. 7. 1876. 



Echinocaris pimctatus, (Hall,) Whitfield. Am. Jour. Sci., 3d Ser., Vol. 

 XIX, p. 7. 1880. 



Capapace obliquely subovate in outline ; widest just 

 posterior to tlie middle, width about two- thirds of the 

 greatest length, which is four-fifths of the free segments of 

 the abdomen ; compressed on the anterior half, becoming 

 regularly convex over the posterior portion. 



Dorsal line straight, about equal to the width of the 

 valves, situated anteriorly, so that one-third the lengtli of 

 the valves projects beyond the posterior extremity of the 

 hinge. 



Margins distinctly marked by a thickening of the test, 

 rounded in front, making a broad curve along the lower 

 edge of the valve, more rapidly curving around the lower 

 jjosterior portion, and extending in nearly a straight line to 

 the extremity of the dorsal line. 



The cephalic portion of the caraj)ace is distinctly marked 

 by a fuiTow beginning at a i:)oint a little anterior to the 

 middle of the dorsal line, curving outward and extending 

 to a point on the lower anterior margin of the valve. This 

 area, therefore, occupies the upper anterior portion of each 

 valve, and is of a broad triangular form with curved sides. 

 It is ornamented by a large rounded elevation, narrow 



