PLATE 81 C. 



Page 

 Fig. 1. EURTPTERUS ROBUSTCS*. 410* 



1. View of the specimen from the lower side. 



2. The ventral side of another specimen of this species, from the collection of Prof. J. S. 



Gardnkr of Whitesboro" (N.York), showing more distinctly the fracture or dehiscence 

 across the segments, indicating the specimen to have been a cast crustf. 



• A farther examination, with other specimens, has shown that the form referred to E. locust ris, \-&t.robustus, 

 has the characters of a distinct species, 

 f Some copies are without this figure. 



