EXPLANATION OF PLATE -XXIV. 



Figures 1-4 DALMANITES VIGILANS Hall p. 276 



1-2, Dorsal and lateral views of an incomplete cephalon, from 

 near Lemont. (Pal. Coll. Walker Museum, No. 9,879. Col- 

 lected by L. H. Hyde.) 3, Dorsal view of an incomplete 

 cephalon, from Joliet. (Pal. Coll. Walker Museum, No. 

 9,909, Van Home Collection.) 4, Dorsal view of a nearlv 

 complete pygidium,from near Lemont. (Pal. Coll. Walker 

 Museum, No. 10,747.) 



Figure 5 DALMANITES ARKANSANA v. Ing p. 278- 



Dorsal view of a nearly complete cephalon, from Romeo. (Pal. 

 Coll. Walker Museum, No. 10,748. Collected by J. H. 

 Handwerk.) 



Figures 6-7 PHACOPS HANDWERKI n. sp p. 271 



6. Dorsal view of a nearly complete cephalon. 7, Dorsal view 

 of a nearly complete individual. Both specimens from near 

 Lemont. (Pal. Coll. Walker Museum, No. 10,749. Collected 

 by J. H. Handwerk.) 



Figures 8-11 ENCRINURUS EGANI S. A. M . .p. 257 



8, Dorsal view of a nearly complete cephalon, preserving the 

 elongate eye-stalks, from near Lemont. (Pal. Coll. Walker 

 Museum, No. 9,901. Collected by J. E. Webb.) 9, Doisal 

 view of a nearly complete individual, from near Lemont. 

 (Pal, Coll. Walker Museum, No. 9,905, Van Home Collec- 

 tion.) 10-11, Dorsal and lateral views of a nearly com- 

 plete pygidium. (Pal. Coll. Walker Museum, No. 10,750, 

 Van Home Collection.) 



Figures 12-13 ENCRINURUS TUBERCULIFRONS n. sp p. 259 



12, Dorsal view of an incomplete cranidium. 13, Dorsal view 

 of a pygidium. Both specimens from near Joliet. (Pal. 

 Coll. Walker Museum, No. 10,751.) 



Figure 14 DEIPHON AMERICANUS n. sp p. 268. 



Dorsal view of a nearly complete cephalon, from near Lemont. 

 (Pal. Coll, Walker Museum. No. 9,899.) 



Figure 15 STAUROCEPHALUS OBSOLETUS n. sp. . , p. 270 



Dorsal view of the type specimen, a nearly complete cephalon, 

 from near Lemont. (Pal. Coll. Walker Museum, No. 9,870. 

 Collected by L. H. Hyde.) 



Figures 16-19 SPHAEREXOCHUS ROMINGERI Hall p. 266 



16, Dorsal view of a complete cranidium. 17-18, Ventral and 

 lateral views of a complete cephalon. Both specimens from 

 near Lemont. (Pal. Coll. Walker Museum, No, 5,270.) 19, 

 Dorsal view of a pygidium. (After Hall.) 



Figures 20-21 CERAURUS NIAGARENSIS Hall p. 263 



20, Dorsal view of a nearly complete cranidium. 21, Dor- 

 sal view of a nearly complete pygidium. Both specimens 

 from near Lemont. (Pal. Coll. Walker Museum, Nos. 9,874 

 and 9,875. Collected by L. H. Hyde.). 



Figure 22 CERAURUS HYDEI n. sp p. 264 



Dorsal view of a nearly complete individual, from near Le- 

 v mont. (Pal. Coll. Walker Museum, No. 9,873. Collected by 

 L. H. Hyde.) 



