PLATE XAIX—Continued. 
Echinocaris SUBL^VIS. 
Page 17^. 
Fig-. 11. The type specimen; di-awn from a gntta-iiei'cha impression of the intei-nal surface of the left valve, 
^■■1 the posterior portion being islightly restoi-ed; showing the number and arrangement of the 
il-'i: ■ 111 nodes, the character of the carina and of the surface ornamentation. : - . .jii; 
Fig. 12. The same, enlarged.to two diameters. ' •’ * , ntis v/o-rird 
Erie shalesi (Portage group..) Paine's Cfeek, Lake county,, Ohio.- rtsa p.- 
Fig. 13. A portion of the abdomen and post-abdomen belonging to the. carapace; showing the i-elatively 
short somites, their conspicuous lateral and faint dorsal spines, the elevated caudal plate and 
comparatively short caudal spines. Enlarged to two diameters./ i, , 
Erie shales. (Poi-tage group.) Paine's Creek, Lake county, Ohio. 
EoHIjNOOARIS condylepis. 
Page 173. 
Fig. 14. The expanded valves of the carapace, natui-al size. 
Fig. 15. The same, enlarged to three diameters, showing the outline of the valves, the number and disposi¬ 
tion of the nodes upon the surface, and the character of the lateral carinse. " 'i'-'’ 
Chemung gi-oup. Belmont, Alleghany county. -n-j in 
Fig. 16. A left valve somewhat comin-essed at rig-ht angles to the axial line and ha-ving the anterior extremity 
slightly liroken. 
Fig. 17. The same, enlarged to four diameters, showing the nodes to be somewhat elongated on account 
of distortion. 
Chemung group. Belmont, Alleghany county. 
Echinocaris multinodosa. 
Page 180. . 
The type sx^ecimen of the species, showing the features of the dorsal surface of the carajiace. 
The lateral carina, which apxiears to be of similar character to that in E. sublwvis, is not well 
preserved, as the specimen has suft'ei-ed some distortion about the ventral margins. 
Erie shales. (Portage grouji,) Paine's Creek, Lake county, Ohio. 
An imiierfect specimen, showing- with gi-eat distinctness the character of the nodes and oi-namenta- 
tion about the hinge. 
Erie shales. (Postage group. ) Paine's Creek, Lake county, Ohio. 
Echinocaris Whitfieldi. 
Page 172. 
The left valve of the carapace, showing the outline and x>roi)Ortions, the low, indistinct nodes ux)on 
the surface and the short antei-o-lateral carina. The fine scaly surface markings about the 
cephalic nodes is not shown. 
This is the tyjie specimen and is enlai-ged to two diameters. 
Poi-tage group. Naples, Ontano county. 
An imxiei-fect specimen, natural size, j-etaining the caudal plate and two of the caudal sjiines ; 
showing the strongly tuberculose surface. 
Portage group. Naples, Ontario county. , l-> 
Fig. 20. 
-....nlc 
Fig. 21. 
Fig. 18. 
Fig. 19. 
