ONCHOCERCIN.E 



417 



Dirofilaria magalhaesi, R. Blancharcl, 1895. 



Syn. : Filaria bancrofti, v. Linstovv, 1892 ; Filaria bancrofti, P. S. de Magalhaes, 



1892 (nee Cobbold, 1877). 



The male measures 83 mm. in length by 0*28 to 0-40 mm. in 

 breadth. The anterior extremity is rounded, and has no papillae (? 6) ; 

 the posterior extremity exhibits a double curve, 

 with four pre-anal and four post-anal papillae on 

 each side. These are large and have a villous 

 appearance. The mouth is round and unarmed, 

 the pharynx measures i mm. in length, is cylin- 

 di ical, very muscular, and its hinder part is 

 dilated. The anus is situated 0*11 mm. in fron 

 of the hind end. There are probably two 

 unequal spicules; one only, however, is known 

 apparently the shorter one the length of 

 which is given as 0*17 to 0*23 mm. 



The female measures 155 mm. in length 

 and o'6 to 0*8 mm. in breadth ; the rings of 

 the cuticle are 0*005 mm. apart (in the male 

 0*003 mm. apart) ; the anterior extremity is 

 slightly thickened and club-like, the posterior 

 extremity is slender, and terminates obtusely ; 

 the lateral line is 0*127 mm. in breadth (that of 



the male 0*007 to 0*008 mm.); the anus opens 0*13 mm. in front of 

 the hind end, the vulva is 2*5 mm. distant from the mouth, the ovaries 

 are two much convoluted tubes. The eggs measure 38 p by 1 1 p. 



This species was first discovered at a post-mortem, in the left ventricle, by J. P. 

 Figueira de Saboia in Rio de Janeiro, and has been described by P. S. de Magalhaes. 



D. immitis occurs in the right ventricle of the heart of the dog in Europe and 

 the Tropics. 



D. repens is also a common subcutaneous Nematode in dogs in Annam. 



Sub-family. Onchocercinae, Leiper, 1911. 

 Cuticle with spiral thickenings. 



Genus. Onchocerca, Diesing, 1841. 



Male with four pre-anal papillae. Female with vulva situated 

 anteriorly. 



Onchocerca volvulus, R. Letickart, 1893. 



Syn. : Filaria volvulus, R. Leuckart, 1893. 



The adult male measures 30 to 35 mm. in length by 0*14 mm. in 

 breadth. The body is white, filiform, attenuated at both ends. The 

 head is rounded and has a diameter of 0*048 mm. The cuticle 



FlG. 300. Dirofilaria 

 magalhaesi : posterior ex- 

 tremity. (After v. Lin- 

 stow.) 



