OLENELLUS AND OTHER GENERA OF MESONACID.E 383 



Elliptoccphala asaphoides Emmons (continued) : page 



10. Enlargement of the reticulated surface of a portion of the outer 

 cheek of an old and large individual. X 6. Locality (27), 

 near Troy, Rensselaer County, New York. U. S. National 

 Museum, Catalogue No. 15413^. 

 Figure 10 is copied from Walcott, 1886, pi. 25, fig. 8. 



Olenellus ?? lualcotti (Shaler and Foerste) 341 



Fig. II. Type specimen from locality (326^) at North Attleborough, 

 Massachusetts. The glabella is crushed so as to make it 

 narrow at the base. 



This specimen was first figured by Shaler and Foerste, 1888, 

 pi. 2, fig. 12; it is redrawn in fig. 11 of this paper. 



Pcedcttiiiias trausifans, new genus and new species (See pis. 25, 32, 33, 



34, 41, and 44) 304 



Fig. 12. Enlargement of the seven posterior segments and pygidium of 

 the specimen represented by fig. i, pi. 33. This clearly shows 

 the difference in thd surface sculpture of the Olenellus thoracic 

 segments and that of the three Pcedeumias rudimentary seg- 

 ments and pygidium. X 3- U. S. National Museum, Cata- 

 logue No. 56808a. 



