STRONG YLIDJ2 273 



while those having an armed mouth are in the subfamily Sclerosto- 

 minae (Ancylostoma, Necator, Triodontophorus, (Esophagostoma, 

 Physaloptera). 



Eustrongylus gigas (Strongylus renalis). -This is the largest round 

 worm infecting man; it is usually found in the pelvis of the kidney 

 (giant strongyle). 



Two or more worms may so distend the kidney as to convert it into a mere shell. 

 Pain, haematuria and other symptoms of pyuria, together with the finding of the eggs, 

 make the diagnosis. There seem to be seven authentic and eight doubtful cases 

 of infection in man. 



The females are about 40 inches (i m.) long and about 1/3 of an inch (8 mm.) 

 in breadth while the male is about 10 inches (25 cm.) long. 



The collar-like copulatory bursa of the male distinguishes it from Ascaris as 

 does also the dark red color. The source of infection is unknown but it has been 

 suggested that the larval stage may exist in fish. 



Many of the reported cases were simply fibrinous clots from ureters or wandering 

 round worms. 



The very characteristic ova, with gouged-out oval depressions, may be found 

 in the urine, and are diagnostically confirmatory. 



Strongylus apri. This nematode is common in the lungs of hogs, producing 

 a bronchitis in young animals but apparently harmless for adult ones. It has been 

 reported once from the lungs of a six-year-old boy. The male is about i inch (25 

 mm.) long with two long spicules. The female is about 2 inches long and has a 

 sharply hooked posterior extremity with the vulva just beyond the bend. The mouth 

 has six lips. The eggs contain embryos when laid. 



Trichostrongylus instabilis. This is a small strongyle formerly known as Stron- 

 gylus subtilis. The male is about 1/6 of an inch (4 mm.) long, and the female about 

 1/4 of an inch (6 mm.). Anteriorly it tapers to a pointed head end which is only 

 about one-tenth the thickness of the posterior extremity. The male has a bursa 

 and two prominent equal spicules. It has been found in the upper part of the small 

 intestine of inhabitants of Egypt and Japan. It does not appear to produce symp- 

 toms. Ova like hookworm ones (63 X 4 1 ft) 



Triodontophorus deminutus. This is a small round worm with three forked 

 teeth taking origin from the pharyngeal lobes. The collar-like mouth orifice is 

 made up of 22 rounded plates just inside the round mouth opening. They are less 

 than 1/2 inch long and have once been found in the intestinal canal. 



(Esophagostoma brumpti. Six young females were found in a cyst of the colon 

 in an African negro. They were about 1/3 inch (8 mm.) long. The anterior end 

 presents an ovoid protuberance with a second cuticular inflation just below it. The 

 buccal capsule is very shallow and surrounded by about a dozen chitinous plates. 

 The mouth has six papillae. 



This species has recently been reported by Thomas in a native of Brazil. 



Physaloptera caucasica. Mouth with two equal laterally placed lips, each hav- 

 ing three papillae and three teeth. The male has a lancet-shaped posterior extremity 

 and is about 1/2 inch long (14 mm. by 0.71 mm.). Female is about i inch long 

 18 



