DESCRIPTION OF PLATES 
Plate I 
Fig. i. Filaria cypseli. Nov. sp. $ and 9 : natural size. 
Fig. 2. F. cypseli. Nov. sp. Head end of 9 • a -> alimentary tract ; oesophagus ; c, opposite 
vaginal orifice ; d, uterus full of ova; e, vagina. The nerve collar is indicated by the 
dark band across the anterior portion of the oesophagus. 
Fig. 3. F. cypseli. Tail end of 9 • <*■> position of anus ; />, uterus. 
Fig. 4. F. cypseli. Head end of <? . a, oesophagus ; b, intestine. 
Fig. 5. F. cypseli. Tail end of $ . The worm has been ruptured near the extreme end, where 
the body contents are extruded, a, alimentary tract ; />, opposite position of anal 
orifice ; c, spermatic tube ; d, spicules. 
Plate II 
Fig. I. Filaria spiralis avium. Nov. sp. $ and 9 : natural size. 
Fig. 2. F. spiralis avium. Anterior end of 9 ■> an d portion of first spiral, a, alimentary tract ; 
b, oesophagus ; c, opposite the position of vaginal orifice ; el, uterus ; e, vagina. 
Fig. 3. F. spiralis avium. Posterior end of 9 > ar) d portion of last spiral, a, alimentary canal ; 
b, opposite the anal orifice, which is seen to be surrounded by five delicate lips, giving 
a rosette appearance; c, the lateral ridge as seen in the concavities of the coils; 
d, uterus, full of ova. 
Fig. 4. F. spiralis avium. Posterior end of the 9 > s 'de view ; a, alimentary canal ; />, opposite 
the position of anal orifice : seen here as a baying in the cuticle ; c, the lateral cuticu- 
lar ridge as seen on the convexities of the spirals ; d, uterus. 
Fig. 5. F. spiralis avium. The embryo : stained specimen of the blood (x 250). The dark spots 
round the worm are the nuclei of the red corpuscles. The sheath of the worm is 
distinctly shewn both at the head and tail ends of the worm. 
Plate III 
Fig. I. Filaria spiralis avium. Tail end of $ shewing its shape ; a, opposite the position of the 
anal orifice ; b, alimentary tract ; c, spermatic tube. 
Fig. 2. F. spiralis avium. Shews the spicular arrangement of the male. The two spicules are 
seen extruded through the wide crater-like anal orifice, situated on a low papilla. 
Behind is indicated the lateral cuticular flange which here comes to the ventral surface, 
to form with the one of the other side a sort of hollow cone at the bottom of which 
is the anal orifice. 
Plate IV 
FlG I. Filaria fusiformis avium. Nov. sp. $ and 9 : natural size. 
Fig 2. F. fusiformis avium. Anterior end of 9 shewing its shape, and a, the position of the 
vaginal orifice. 
