Somers ( \ & y 
as i ‘ 
- x’ (> dbp ee F Dat 
PLATE XV.—(Continued.) 
PSEUDOSPHAEREXOCHUS TRENTONENSIS Clarke...... eet! 
Figs. 24,25. Dorsal and lateral views of an incomplete eeiatiiaent Le 
Jacksonburg, Locality 174 A.° y 
ENGRINURUS, TRENTONENS!S Wale... . 5. =<2-s<s 3-2 | 
Fig. 26. Dorsal view of a nearly complete pygidium. Jacksonburg, 
Locality 174 A™ (x2). 
27. The same in outline. Natural size. 
CERAURUS PLEUREXANTHEMUS Green............ Pee 
Fig. 28. An incomplete cranidium. Jacksonburg, Locality 174 A.° — 
PTERYGOMETOPUS CALLICEPHALUS (Hall).............. 
Fig. 29. An incomplete head. Jacksonburg, Locality 176 A. 
30. A complete pygidium. Same locality. 
351. A nearly complete pygidium of larger size. Jacksonburg, 
Locality 174 A 
32. A complete individual (after Billings). 
Fig. 33. An incomplete pygidium. Jacksonburg, Locality 174 At 
(410) = 
