202 
PALEONTOLOGY OF NEW YORK. 
Diptbrocaris pes-cerv^. 
PLATE XXXV, FIGS. 20, 21. 
Bipterocaris pes-cervcB, Clarke. Amer. Jour. Science, Third Series, vol. xxv, p. 123, figs. 4 and 5. 1883. 
Biptei'ocans pes-cervcB, Jones and Woodward. Geol. Mag., Dec. hi, vol i. No. 8, p. 349. 1884. 
Bipterocaris pes-cerrxB, Etheridge, Woodward and Jones. Second Kept. Committee on Fossil Phyllopoda 
of the Palieozoic Rocks, p. 11. 1884. 
Bipterocaris pes-cervcB, Etheridge, Woodward and Jones. Third Kept. Committee on Fossil Phyllopoda 
of the Palaeozoic Rocks, p. 3. 1885. 
Carapace small, elongate-lanceolate in outline ; isthmus slightly anterior and 
one-fourth as long as the shield. Cephalic cleft short, margins rapidly 
diverging, and making obtuse and rounded angles on the periphery. 
Abdominal cleft long and narrow, its margins making sharp angles at the 
posterior extremity. 
The surface is ornamented as in the preceding species. 
Dimensions of the type specimen, length 11 mm., width 6 mm. 
Distribution. Chemung group. In the lower shales of the group at Dansville, 
Livingston county. 
