ART. 6 NEW FORMS OF NEMATODE WORMS CHANDLER 9 



posterior end, terminatino: in a narrow fingerlike tail with bluntly 

 rounded end. Cuticle with coarse annulations set about 12^ apart 

 in the esophageal region and gradually becoming more widely spaced 

 to intervals of 25/x to 30m in the posterior part of the body; annulations 

 provided with numerous small recurved spines. Mouth cavity 

 (fig. 14) rectangular, about 25/x broad and 15/x deep with a further 

 interval, w^ith a narrow lumen, between the floor of the capsule and 

 the anterior end of the esophagus. Anterior border of esophagus 

 projecting slightly toward median line, giving the appearance of a 

 pair of hawklike- jaws in optical section. Head bounded by an 

 inconspicuous ridge. Esophagus a straight narrow tube about 875m 

 long with a diameter of about 55m; nerve ring about 450m from the 

 anterior end. The intestine has the same diameter as the esophagus, 

 the demarcation between the two being very indistinct; it continues 

 back to the anus as a straight narrow tube; the anus is about 155m 

 from the posterior end. The posterior end of the body (fig. 13), 

 gradually narrowing, curves S-like, ending in a ventrally curved, 

 fingerlike tail with nearly parallel sides, about 55m in diameter. At 

 the anus it widens out to a diameter of about 85m- Vulva 390m from 

 the anterior end, situated on a distinct prominence. Vagina an 

 elongated saclike structure, about 1.4 mm. in length, gradually 

 widening out to a diameter of about 155m near its bluntly rounded 

 end. The uteri open into the vagina by a narrow tube about 35m in 

 diameter; the two uteri split apart almost immediately and continue 

 almost straight to the posterior part of the body where they abruptly 

 narrow, ending in two slightly coiled ovaries. 



Host. — Argus pheasant {Argusianus argus). 



Location. — Peritoneal cavity. 



Locality. — Calcutta Zoological Garden, Calcutta, India. 



Type specimens. — United States National Museum Helmintholog- 

 ical Collection No. 8011. 



EXPLANATION OF PLATES 

 Plate 1 



Fig. 1. Protofilaria furcata. Posterior end of male. 



2. Protofilaria furcata. Posterior end of female, showing posterior extremi- 



ties of ovaries. Anus in cleft at end, intestine not shown. 



3. Dirofilaria digitata. Vulval region, showing vagina and union of esoph- 



agus and intestine. 



4. Dirofilaria digitata. Tail of female, showing anus and posterior digi- 



tations. 



5. Aproctoides lissum. Tail of male, showing spicules, intestine and sperm 



duct. 



6. Aproctoides lissum. Head of male, showing esophagus and anterior end 



of testis. 



