Page:Second Geological Survey of Pennsylvania Report of Progress PPP.djvu/36

Tropidocaris bicarinata,Beecher.
Page 16
Fig.3.	A carapace with the valve opened and the test somewhat broken, showing the eye-tubercles and a pair of longitudinal ridges on each valve.
" 4.	The right valve of a smaller individual.
" 5.	Two segments of the abdomen with a. portion of the telson attached, showing the form and ornamentntion of the somites. Chemumg group ; Warren, Pa.
Tropidocaris interrupta,Beecher.
Page 18.
Fig.6.	A right valve of this species showing the form and ornamentation. Chemung group , Warren, Pa.
Tropidocaris alternata, Beecher.
Page 19.
Fig. 7.	An imperfect left valve. preserving the longitudinal ridges, and showing the tubercles and optic node on the cephalic portion.
" 8.	A fragment of a large left valve, bearing the impress of the plates of an echiuoderm. Waverly group ; Warren, Pa.
Mandibles.
Page 9.
Fig. 9.	A specimen preserving the mannbrium, and showing the number and character of the denticles.
" 10.	The inner edge of a smaller example.
" 11.	The crown of a large specimen with the denticles well-preserved and showing its arched and lunate form. Hamilton group; New York.