176 
PALEONTOLOGY OF NEW YORK. 
Post-abdomen consisting of a short, triangular caudal plate, which is produced 
into a slender, carinate telson, having a length somewhat greater than that 
of the abdomen. The cercopods have about the same length. 
Dimensions. A single specimen of average size retaining the parts in con¬ 
junction affords the following measurements ; 
Body. Coplialothoi-ax. Abdomen. Post-abdomen. 
Length_ 29 mm. 9 mm. 9 mm. 11 mm. 
Width__ 6 mm. 2 mm. _ 
This very distinctly defined Echinocarid finds no close ally among the known 
species. Some points of similarity in general form and outline are suggested 
by the species E. pustulosa and E. sublavis, Whitfield, but specific differences 
in the number and disposition of the carinae and the shape of the nodes are 
readily apparent. Its comparative abundance, at the single locality where it is 
known to occur, is interesting and in consonance with the known gregarious 
habits of both fossil and recent forms of such crustaceans. 
Distribution. Chemung group. “ In the shales at the base of this group as 
exposed at Warren, Pa.; belonging to the upper strata of the series when 
considered in relation to the entire thickness of the group in New York and 
Pennsylvania.” (Beecher, loc. cit.) 
EcHINOCARIS SUBLiEVIS. 
PLATE XXIX, FIGS. 11-13. 
Eehinocaris siMevis, Whitfield. New Forms of Fossil Crustacea, etc. Am. Jour. Science, 3d ser., vol. xix, 
No. 109, p. 36, pi. (unpublished), figs. 4, 5 and 6. 1880. 
Echhwcaris suUevis, Packard. Palieozoic Allies of Nebalia. Am. Naturalist, p. 952, fig. 11. Dec. 1882. 
Echhiocaris sublevis, Packard. Monog. N. Amer. Phyllopod Crustacea. Twelfth Rept. U. S. Geol. Surv., 
pp. 450, 451, 6g. 71b. 1883. 
Eehinocaris sublevis, Beecher. Ceratiocaridie from the Chemung and Waverly groups, etc. Second Geol. 
Surv. Penna., vol. PPP, p. 5. 1884. 
Eehinocaris sublCBvis, Jones and Woodward. Notes on Phyllopodiform Crustaceans referable to the genus 
Eehinocaris, etc. Geol. Mag. Dec. iii, vol. i. No. 9, p. 2. pi. xiii, figs. 3, 4 and 5. 1884. 
Echiiwcaris sublwvis, Etheridge, Woodward and Jones. Third Rept. Com. on Fossil Phyllopoda of the 
Palaeozoic Rocks, p. 35. 1885. 
Cephalothorax. Outline obliquely sub-ovate, length to width as 3 to 2. 
Surface irregularly convex in front, evenly convex behind. Hinge-line 
