NEMA THELMTNTHES 



It does not appear to have the central viscus seen in microfilaria 

 of F. hancfofti. In stained specimens there is an area free from 

 nuclei anteriorly, a transverse break at 34 ^, a V-spot at 49 ^u, and 

 the tail-spot at 125 (jl. 



A short t3rpe, measuring 90 to 100 has been noted. There 

 is no periodicity in its appearance in the peripheral blood. It 

 never occurs in large numbers, but it is always there day and night. 



Many unsuccessful attempts have been made to trace its life- 

 history. Its larvae are said to have been found in the thorax in 

 Panoplites [africanus ?), Stegomyia fasciata, and TcBniorhynchus 

 fuscopennatus. It will not develop in a large number of blood- 

 suckers — e.g., species of Anopheles, Culex, Pulex, Pedwulns, and 

 Uranotcenia. Wellman and Feldham claim to have found its 

 development in a tick {Ornithodoros mouhata), as first suggested 

 by Christy. According to Leiper, however, these are spermato- 

 phores ! 



It is to be noted that it only occurs in areas covered with dense 

 forest and possessing swamps, which indicates that the host prob- 

 ably requires shade in the day and water to lay its eggs in. 



Pathogenicity. — Nil. 



Dirofilaria Railliet and Henry, 1911. 



Filariidae with very long filiform body, with a striated cuticle 

 unprovided with bosses, mouth unarmed, with six cephalic papillae. 

 Males with a spiral tail. Female with vulva in anterior hundredth 

 of body. Viviparous. 



TypQ,~Dirofilaria immitis Leidy, 1856. 



Dirofilaria magallisesi Blanchard, 1895. 



Synonym. — F. bancrofti Magalhaes, 1892, nec Cobbold, 1877. 



In 1887 Magalh^s described male and female forms of a Filaria 

 found by Figeira de Saboia in the left ventricle of the heart of a 

 child in Rio de Janeiro. 



For a time it was mistaken for F. bancrofti, but in 1894 Manson 

 pointed out that it was a different species, and in 1895 Blanchard 

 gave it the present name. 



Morphology.- — The worms were white, opalescent, and trans- 

 versely striated, the head club-shaped and simple, mouth terminal, 

 oesophagus with a bulb, and there was a rounded tail. The male 

 measured 83 millimetres in length and 0-28 to 0-4 millimetre in 

 breadth, and possessed a rounded tail, with a cloaca o-ii milli- 

 metre from its tip, with two spicules and four pre-anal and three 

 post- anal pairs of papillae. 



The female was 155 millimetres in length, and o-6 to o-8 milli- 

 metre in breadth, with a vulval opening 2-56 milhmetres behind the 

 mouth, and an anal opening 0-13 millimetre in front of the tip of 

 the tail. 



hii e-History and Pathogenicity.— Unknown. 



