Carhoniferovi< Trilohites. , 95 



lobe, both of the thorax and i^jgidium, as well as thptsc od the lateral lobes, 

 Wiej are Very sniall and regularly disposed, so as to form a single row on 

 each segrinent. 



" En ti^ length, 1.19 inch; breadth of head, about 0.80 inch; length of 

 pygidium. 0.44 ; breadth of do., 0.56 ; length of thora:^, 0.33 ; breadth of 

 do.. 0.60J 



••This species is remarkable for the structure of its eyes, which instead 

 of being as usuial, covered by the palpebral lobes, have the form and ap- 

 pearance of distinct oval tubercles, with small depress^ palpebral lobes 

 merely connecting with theur inner sides. **»«»," 



LwcitMff (ftml pmtMii. — ^Warsaw, Illinois; Keokuk limestone of the 

 Lower Carboniferous series. 



We have exaiuiined sjjteciimeiis of this species from Warsaw, 

 III., mow m the Mnseum of Matural Kmtprj of Mew York. The 

 pjgidinni of these s|i>e€iimeinis is not a littHe ilatteiaed ;On the axis 

 or furrowed «»ii its sides, bet more roiiied amcH less broad than 

 that given bj Messrs. Meek and Worthen in their fi^re of r the 

 sji>ecnes. 



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