l66 PALEONTOLOGY OF NEW YORK. 



ECHINOCARIS, Whitfield. 1880. 



ECHINOCARIS PUNCTATA. 

 PLATE XXVII, FIG. 10; PLATE XXVIII, FIGS. 1-7; and PLATE XXIX, KIGS. 1-8. 



s, Hall. Sixteenth Rept. N. Y. State Cab. Nat. Hist., p. 74, pi. i, fig. 8. 1863 

 tatus, Hall. Si Rept. N. V. State Cab. Nat. Hist., p. 72, pi. i, figs. 1-3. 1863. 



. II mi,. Illustrations (if Devonian Fossils, pi. xxiii, figs. 4, 5. 1876. 



tis, Hall. Illustrations of Devonian Fossils, pi. xxiii, fig. 7. 1S76. 

 iitfield. Journal of Science, Third Series, vol. xix, p. 37. 18S0. 



. Mti). Palaeozoic Allies of Nebalia. Amer. Naturalist, p. 952, fig. 12. 1882. 

 . Packard. Monog. North Amer. Phyllopod Crust. Twelfth Ann. Rept. U. S. Geol. 

 Survey, p. 451), fig. 70. 1S83. 

 M og. North Amer. Phyllopod Crust. Twelfth Ann. Rept. U. S. Geol. 

 Survey, p. 451. L883. 

 [BR. Ceratiocaridse from the Chemung and Waverly groups. Second Geol. 



- u-v. P a . vol PPP, p. 6, pi i, figs. 13-16. 1884. 



! - Ji ill Woodwakh Notes on Phyllopodiform Crustacea, referable to the genus 



Magazine, l»ec. iii, vol. i, No. fl, p. 2, pi. xiii, fig. 2. 1884. 

 Woodwabd and Jones. Third Rept. Committee on Fossil Phyllopoda of 

 i he Palaeozoic Rocks, p. 35. 1885. 



Cephalothorax Each valve obliquely sub-ovate, widest posteriorly. Surface 



gently and irregularly convex, most elevated in the postero-lateral region. 



Length to greatesl width as 1.5 to 1. Hinge-line short, somewhat longer 



than one-half the length of the carapace, slightly thickened and elevated, 



n<l upon the posterior half bearing three or four low tubercles. The 



nterior margins of each valve are slightly reentrant at the dorsal line, 



thence abruptly and rounding to the ventral edge in a constantly 



ling are to the postero-lateral extremity; thence forward the margin is 



irj.lv curved for a short distance and slopes to the hinge in a nearly 



Thi posterior reentrant angle thus formed between the valves 



1 deep. The entire margin is normally somewhat thickened 



into a sharp ridge; in specimens from the shales it is 



In well preserved examples, the posterior margin bears 



. which in old individuals are elongated into stout 



