l7g PALEONTOLOGY OF NEW YORK. 



the length of the lasl three somites of the abdomen. The cercopods are 

 curved near the 1k.sc of attachment, and have a slightly greater 

 _th than the telson. 



Dimensions. The carapace of this species measures 17 mm. in length and 

 12 mm. in greatest width. The three somites of the abdomen and the telson 

 have a length of 13 mm.: of this the first somite measures 1.5 mm. in 

 length ; the second l.S mm.; the third 2 mm.; the telson to the apex of the 

 spine 7 mm. 



D trihutiun. In the calcareous concretions of the Erie shales, a formation 

 approximately equivalent to the lower Portage shales of New York. LeRoy, 

 hake county, Ohio. 



EcHINOCARIS PUSTULOSA. 



PLATE XXIX, FIGS. '.', 10. 



,'. Whitfield. Amer. Jour. Science, Third Series, vol. xix, No. 109. p. 88, pi. (unpub- 

 lished), fig-. 7. LS80. 

 'ackard. Monog. N. Amer. Pbyllopod Crustacea. Twelfth Ann. Rept. U. S. Geol. 

 Surv., i'. 451. iss;:. 

 i ieratiocaiidse from the Chemung and Waverly groups, etc. Second Geol. 

 Surv. Penna . vol. PPP, p. 5. 1^-1. 



Notes on Phyllopodiform Crustaceans referable to the genus 

 Geol. Mag. Dec. iii. vol. i, No. 9, p. 2. pi. xiii, tig. 6. 18S4. 

 .i . Woodward and Jones. Third Rept. Committee on Fossil Phyllopoda of 

 I' i!:i nzoic Rocks, p. 35. 1885. 



uothorax small, longitudinally sub-ovate; length to width as 3 to 2. 



Surface irregularly convex Hinge-line short, straight, length less than 



ffo-thirds the length of the carapace. The anterior extremity is broken 



the original specimen, but judging from the position of the nodes 



the thoracic portion of the carapace and the indications afforded by 



ten edge, the anterior margin had probably about the same curvature 



species Echinocarii sublavis, although in the original figure it is 



as strongly incurving near the hinge. The ventral margin is 



at the posterior extremity, bending somewhat abruptly to 



