Bull. U. S. F. C. 1899. (To face page 492.) 



Plate XV. 



\ \ W . V 190 



186 



192 



^,, - ^~-^. 197 



196 



194 



185. Ai^cnris, up. immature, from Lophiits pi^cxUoriitn. VeiUnil view of 



head, x 300. 

 18*;. rpperlip. >: 300. 

 1H7. I'ostorior end, lateral view, x 300. 

 18.S, Fiiaria rubra Leidy, from Cf.niropristaf striutus. Lat^Tal vit-w of 



head, x 75. 

 1^9. Optical section of same. X 200. 



190. opposite side of same, x 200. 



191. Posterior end. x 200. 



192. Filn rla serrafa sp. nov.. irom Phi/ci-'i 



end of female, x 300. 



193. Head of male, x 300. 



191. Posterior end of same, sliowinj,- l<i 



plate-s. X 240. 

 195. Copulatory spines, x 240. 

 19(i. Plan of anal papilla;. 

 197. Spiroplera pccthiifcr sp. nov.. from 



male, x 300. 

 19JS. Posterior end of same, lateral view. 



Umiiis. Head 

 ngitudinal m 



and anterior 

 rrate rnu>i of 



Splif/nia zyjifiia. Head of 

 X (>-5. 



