K0.2267. A^BTF BRANCUIOBDELLID WORMS— ELLIS. 265 



Plate 11. 



Fig. 1. — Side view of type-specimen of PterodrUus durhini Ellis, from White 

 IJiver, Iroudale, near Anderson, Indiana. 

 2. — Dorsal view of type-specimen of Xironodvilus formosus Ellis, frora 



White River, Irondale, near Anderson, Indiana. 

 3.— Side view of type-specimen of Camharincola inversa Ellis, from Eugene, 

 Oregon. 



Plate 12. 



Fig. 1. — Ventral view of type-specimen of Xironogiton orcgonensis orcgonensis 



Ellis, from Eugene, Oregon. 

 2. — Dorsal view of type-specimen of Xironogiton occidentalis Ellis, from 



Crab Creek, Washington. 

 3. — Ventral view of type-specimen of Xironogiion orcgonensis pectinatus 



Ellis, from Sequallitchew Lake, Washington. 



»r.ATE 13. 



Fig. 1. — Ventral view of Xironogiton instaMlius (Moore) from Queens, West 



Virginia. Contracted specimen. 

 2. — Dorsal view of Xironodritus 'pulclierrimus (Moore), from Right Uand 



Fork of Chenowith Creek, Queens, West Virginia. 

 3. — Ventral view of Xironogiton instatyilius (Moore), from Queens, West 



Virginia. Partly expanded specimen. 



