I7 , PALEONTOLOGY OF NEW YORK. 



:haracterized by a strong transverse node just behind the 



nucha! furrow, acutely tubercled near the hinge-line, and beneath this an 



node extending from this furrow obliquely backward. A lateral 



ride ■ carina takes its origin near the anterior portion of the carapace and 



ickward in a broad sigmoid curve, becoming obsolete near the 

 posterior region. A.bove this carina the postero-dorsal area is gently rounded 

 and smooth. 



S smooth or minutely punctate. 



A OMEN ami iF.i.so.N unknown. 



Dim Three specimens of this species have been observed, and all 



ipproximately of the same size, viz.: length 9 mm., width 5 mm. 



\tions. Eckinocaris crmdylepis appears in many respects almost a minia- 



ure of Echinocaris punctata of the Hamilton shales. The nodes are essentially 



me in number ami disposition, though less conspicuous; the lateral carina 



s much shorter, hut has the same sigmoid curve; the ridge upon the postero- 



dorsal margin is. however, much more strongly elevated than in the latter 



9 not tubercled or spinose. The general abbreviation of all the 



in which it resembles E. punctata is a persistent character, and it will 



iish the two species, while it may indicate their common 



origin. 



Chemung group, in the soft greenish shales at Philipsburgh 

 (now Belmont), Mleghany county. 



Echinocaris sociaus. 



PLATE XXX, PIGS. 1 12 



1= from the Chemung ana Waverly groups. Second Geol. Surv. 

 1 1'IT. y. 10, pi. i.figs. I 12. 1884. 



• w ward and Jokes. Third Rept. Committee on Fossil Phyllopoda of 



' c Roi i . p. 35 1885. 



■ obliquely sub-ovate in outline, widest posteriorly. Length along 

 •■ to greatest width as I to L.5; to greatest length as 1 to 1.8. 



