324 THE ANIMAL PARASITES OF MAN 



LITERATURE. 



BALBIANI, G. Rech. sur le dev. et le mode de propagat. du Strangle geant. (Journ. 



de 1'anat., 1870, vii., p. 180. Compt. rend. soc. biol., Paris, 1874 [6], i., p. 125.) 

 BLANCHARD, R. Nouv. observ. de Strongle geant chez 1'homme. (Ibid., 1886 [8], 



iii., p. 379.) 

 MAGUEUR. Strongle geant du rein expulse en partie par le canale de 1'uretre chez 



un enfant de deux ans et demi. (Journ. med., Bordeaux, 1887-88, p. 337.) 

 TRUMBULL, J. A Case of Eustrong. gigas. (Med. Record, 1897, Iii., No. 8, p. 256. 



Ref. C. f. B. u. P., xxii., p. 619.) 

 STILES, Ch. W. Notes on Paras. 49. (Ibid., 1898, liii., No. 14, p. 469. Ref. C. f. 



B., P. u. I., xxiv., p. 505.) 

 ROTHSTADT, J. Ueb. d. York. v. Eustr. gig. i. Hund. d. Stadt Warschau. (Arb. 



zool. Labor, d. Kais. Univ. Warschau, 1897, Russ.) 



Gen. 9. Strongylus, O. F. Miiller, 1780. 



The mouth has six small papillae ; the male has a bursa copulatrix and 

 two spicules ; the female has two ovaries, the posterior extremity is pointed. 

 The vulva is situated in the posterior half of the body. 



Strongylus apri, Gmelin, 1789. 



Syn. : Gordius pulmonalis apri, Ebel, 1777 ; Ascaris apri, Gmelin, 1789 ; 

 Strongylus suis, Rud., 1809 ; Strongylus paradoxus, Mehlis, 1831 ; Strongylus 

 elongatus, Duj., 1845; Strongylus longevaginatus, Dies., 1851. 



The male measures 12 25 mm. in length ; the bursa copulatrix 

 is two-lobed ; there are five ribs in each lobe ; the spicules are 

 thin and about 4 mm. in length. The females measure 50 mm. 

 in length, the anus is close in front of the posterior extremity, 

 which is recurved like a hook; the vulva is close in front of the 

 anus. The eggs are elliptical, 0*05 0*1 mm. in length, 0*039 

 0*072 mm. in breadth ; when the eggs are deposited the embryo 

 is already formed. 



Strongylus apri frequently lives in the bronchial tubes usually 

 the smaller ones of the pig 1 and wild boar ; it is also found occa- 

 sionally in sheep and in man ; in young pigs it is apt to set up 

 a bronchitis, which frequently causes death'. 



1 The reports of the city inspection of meat in Berlin state that Strongylidce in 

 the lungs of pigs are by no means rare ; therefore, the lungs of 1,941 pig? were con- 

 demned between 1885-86, of 1,641 between 1886-7, of 3,237 between 1887-8, of 4,855 

 between 1888-9, ol 7> X 97 between 1889-90, and of 5,574 pigs between 1890-1, &c., &c. 

 Ostertag found Strongylus apri in 60 per cent, of the pigs examined in the Berlin abat- 

 toir ; Meyer in Leipzig found the parasite in 15 per cent, of the native pigs and in 52 

 per cent, of the Hungarian pigs. 



