235 



EURY. 



E. Hall, Proceedings of American Philosophical Society, Phila- 

 delphia. Found by Mr. Mansfield in his Kittanning (Darling- 

 ton) coal bed roof shales. (Q, 56, 72.) XIII, 



Eurypterus {Anthraconectes) mazonensis. (Meek and 



WlMt — — 1^/, PI. 37. 



Worthen. Amer. Jour. Science, Vol. 46, 1868, page 21 ; Illinois 

 Keports, Vol. 3, 1868, page 544.) Oollett's Indiana Et., 1882, 

 page 168, plate 37, fig. 1, natural size, outline (indistinct) ; a. 

 J, c, crushed and broken legs; AA, impressions of the angular 

 ends of the back half of the body segments ; m, hypostoma 

 (under lip) in place ; ^, an imperfect paddle (natural joint at 

 ^ -^j ; ^^? basal segments of paddles ; M, mesial appendage of 

 operculum; 1, 2, 3 its apparent joints ; x, x, tt, its side wings; 

 0, place of the mouth. Fig. 2, the hypostoma enlarged. Fig. 

 3, part of paddle enlarged to show how its surface is sculptured. 

 — This unique little crustacean had larger cousins in the Goal 

 era; but their time was nearly past; for the real age of these 



