628 



NEMA THELMINTHES 



Pathogenicity. — ^The specimens were found in the papules, and 

 also in the blood at the beginning of the illness, but not in the isdces, 

 urine, or sputum. 



Life- History . — Unknown . 



LeptoderaDujardin, 1845. 



Anguillulidse with mouth guarded by two, three, or six lips. Male with 

 or without bursa, which, when present, never surrounds the point 01 the tail. 

 Two equal spicules, and three pre-anal papillae. Female with the tail pro- 

 longed into a long unsymmetrical point. 



Leptoderapellio Schneider, 1866. 



Synonyms. — Pelodera pelUo Schneider, 1866; Rhahditis genitalis Scheiber, 

 1880. 



Leptodera pellio is merely an occasional parasite in man. Infection arises 

 in rather a peculiar manner. The larva lives in the earthworm [Lumbricus 

 tevrestris), while the adults exist in decomposing matter in the soil. 



The Hungarian peasants use soil for making poultices, from which the 

 little worms apparently make their way into the vaginae of women and live 

 there. Oerley has shown experimentally that they will live in the vagina 

 of a mouse. 



Morphology. — Male, 0*8 to i-os millimetres in length, with a bursa supported 

 by seven to ten ribs on each side. Spicules, which are not quite alike, measur- 

 ing 27 to 33 /X in length. Female, 0-9 to 1*3 millimetres in length, with a vulva 

 slightly posterior to the middle of the body. 



Pathogenicity.— Nil. 



Family 3. Angiostomid^. 



Nematoda characterized by heterogony, each species having a 

 free-living bisexual rhabdite form and a parasitic hermaphrodite 

 filarial form. 



Strongyloides Grassi, 1879. 

 Synonyms. — Pseudorhabditis Perroncito, 1881 ; Rhabdonema Leuc- 

 kart, 1882. 



The parasitic form has an unarmed mouth, long cylindrical 

 oesophagus, which reaches nearly to the middle of the body. The 

 free-living stage has a small mouth, short oesophagus with a double 

 dilatation, in the hinder part of which are small teeth. The male 

 spicules are of equal size. 



Strongyloides stercoralis Bavay, 1877. 



Synonyms. — Anguillula intestinalis et stercoralis Bavay, 1877; 

 Leptodera intestinalis et stercoralis Cohhold ; Pseudorhabditis stercoralis 

 Perroncito, 1881; Rhabdonema strongyloides Leuckart, 1883; 

 R. intestinale Blanchard, 1886. 



History,— This little worm, which is not uncommonly met with 

 in faeces, was first described in 1876 by Normand in the faeces and 

 the intestine of French soldiers just returned to Toulon from Cochin 

 China. 



At first it was thought that there were two species — one in the 

 faeces {Anguillula stercoralis) and the other in the bowel {A. intes- 



