xviii DESCRIPTION OF PLATES 
Fig 3. F. funformh avium. Posterior end of 9 shewing its shape ; a, alimentary tube ; near 
the termination of the uterine tube. 
Fig. 4. F. fusiformis avium. The embryos : a specimen of stained blood shewing the embryos 
inside, partly and completely out of their sheaths, also an emptv sheath. The position 
of some of the 'spots' is also seen ( x 350). 
Plate V 
Fig. 1. Filaria spiralis major avium, Nov. sp. 9 ar >d $ : natural size. 
Fig. 2. F. spiralis major avium. Anterior end of 9 . a, opposite the anal orifice ; b, uterus; 
f, vagina. 
Fig. 3. F. spiralis major avium. Tail end of 9 • a -> opposite the anal orifice. The cuticular 
knobs are well seen on the convexities of the spirals. 
Fig. 4. F. spiralis major avium. Anterior end of $ . a, oesophagus ; b, alimentary canal ; 
c, spermatic tube. 
Fig. 5. F. spiralis major avium. The strongly incurved tail of the $ . a, opposite the position 
of the anal orifice and spicules. 
LATE 
VI 
Fig. I. Filaria spiralis major avium. The embryo in a specimen of stained blood, shews the 
position of some of the 'spots' and the characteristic wire nail shaped posterior end 
(x 250). 
Fig. 2. F. shekletonii. Nov. sp. The embryo in a specimen of stained blood. The position 
and characters of the 'spots' are well marked, as well as the sharply pointed tail 
(X250). 
Fig. 3. F. shekletonii. 9 : natural size. 
Fig. 4. F. shekletonii. Head end of 9 • «■> oesophagus ; b, the alimentary tract ; c, opposite 
vaginal orifice ; d, uterus. 
Fig. 5. F. shekletonii. The posterior end of 9 • "■> intestine; b, opposite anal orifice; e, uterus. 
Plate VII 
Fig. 1. Filaria fa lei for mis. Nov. sp. $ and 9 ■ natural size. 
Fig. 2. F . faleiformis. Nov. sp. Head end of 9- «, oesophagus ; b, intestinal canal ; c, opposite 
vaginal orifice ; <7, vagina ; e, uterus. 
Fig. 3. F. faleiformis. Tail end of 9- a i position of anal orifice; b, ovary; c, uterus; d, the 
corrugated cuticle. 
Fig. 4. F. faleiformis. Head end of $. oesophagus; b, intestine; e, opposite position of 
nerve collar crossing the oesophagus. 
Fig. 5. F. faleiformis. Tail end of $ shewing the spicules a and b extruded through the wide 
anal orifice ; e, papillae ; d, base of spicules. 
LATE 
VIII 
Fig. I. Filaria faleiformis. Tail end of $ shewing spicular arrangement not extruded; 
numerous spermatozoa are seen. 
Fig. 2. F. faleiformis. The embryo in a specimen of stained blood ; shews the characteristic 
'spot' ( x 250). 
