l72 PALEONTOLOGY OF NEW YORK. 



ECHINOCARIS WHITPIELDI. 

 PLATE XXIX, FIGS. 20, 21. 

 ike. Bull. U. S. Geol. Sum , No. L6, Higher Devonian Faunas of Ontario 

 inty, N. Y-, p. ••''■ pi- >'. fi £S- 3 > 4 - 1SS5 



w elongate, irregularly hemicordate ; length of each valve some- 

 what less than twice the width, greatest width through the center; margin 

 distinctly elevated. Hinge-line long, straight, scarcely equal to the greatest 

 length of the carapace; curving gently outward toward the anterior extrem- 

 ity, whence the margin is abruptly deflected in a straight line for a short dis- 

 tance, and then sharply curved to the anterolateral edge, which is also nearly 

 straight, rounding to the ventral margin which is sub-parallel with the hinge, 

 the posterior margin being truncate and slightly incurved. 



'ml furrow indistinct on account of the flattening of the specimen. 



I halic region relatively small, having less than one-third the width of the 

 carapace; its surface is almost wholly occupied by a low node, well defined 

 on it< posterior margin, but becoming obsolete toward the hinge. The surface 

 of this node bears a number of elongate pustules. Close upon the hinge are 

 two small tubercles, tic posterior of which probably represents the eye- 

 node 



Tie Thoracic region, near the hinge-line and just behind the nuchal furrow, 



hears three parallel, elongate tubercles, one above the other; and behind them, 



ituated more ventrally, an indistinct transversely elongate node. A short 



ridge or carina takes its origin at the base of the cephalic node, near the 



ero-lateral margin, and passes obliquely backward nearly parallel to this 



mai oming i apidly obsolete. 



'lie is marked by numerous low, scattered tubercles on the ventral 



postero-dorsal areas. On the cephalic region the finer sculpture is 

 tely squamose, a feature not exhibited in other species of this genus. 



■ unknown. 



tie fragmenl of shale which contains the carapace also 



