109 



Proetus. (Species undeterminable.) 



Durham, J. Townsend, 1882 : a single well preserved cast of a pygidium, 

 ■which the writer has not been able to identify with any known species. 

 This pygidium is nearly semicircular in outline, with a narrow, flat, smooth 

 margin. Its axis is prominent, conical and marked with ten annulations, 

 -while the pleural ribs on each side are about nine in number. 



EURYPTERIDA. 



Eu^YPTEKTJS BoYLEl, Whitsaves. 



Mirypteni-i Boyhi, Whiteaves. 1884. This volume, pt. 1, p. 42, pi. 7, fig. 3. 



Elora, David Boyle, 1881 : the specimen described and figured in the 

 -first part of this volume. 



H 



