6/4 



NEMA THELMINTHES 



an indistinct ventral lobe. There is a slight ventral enlargement 

 just posterior to the point at which the bursa joins the body-wall. 

 The costa dorsalis is divided at its base into two diverging branches, 

 which are bipartite. The common base of the costa dorsalis and 

 costa dorsalis externa is very short, while the latter ray is long, 

 slender, and clavate. The costa lateralis externa is closely joined 

 to the costa lateralis media. Two small precaudal papillae can be 

 seen anterior to the ventral rays. The spicules are long and slender, 

 0*92 millimetre in length, and terminate in barbed points. 



Female is 9 to I2'6 millimetres in length; vulva in the anterior 

 half of the body, but near the equator. Eggs 577 to 80 /i by 35 

 to 52-5 jn; average, 66 by 40 jn. 



Life-flistory. — This is the same as Ancylostoma duodenale. 



Zoological Distribution. — Man and the gorilla. 



Pathogenicity. — It causes ankylostomiasis in certain regions. 



Synonym. — (?) AncylosLoma braziliense Gomez de Faria, 1910. 



Definition. — Ancylostoma with one large tooth at the anterior 

 edge of the mouth capsule, and below and behind this a very small 

 tooth towards the middle line. Lobes of bursa almost as broad as 

 long. 



Remarks.— This worm was found in cats and dogs in India, and 

 is the same as that found in the civet cat in Ceylon, and in man 

 in Bengal by Clayton-Lane, and called A. ceylanicum. 



It has also been found by Darling in a Tamil and a Chinese in 

 Kuala Lumpur, and also in dogs, in which they were frequently 

 found. 



Clayton-Lane suggests that the genus Ancylostoma should be 

 divided into two subgenera— viz :— 



G. de Faria maintains that A. braziliense and A. ceylanicim are 

 probably not the same, because of the character of the oral capsule 

 and bursa] rays. 



Nematoda with simple mouth, and a cuticular bursa in the male 

 without rays. One spicule. 



Eustrongylidae with unarmed mouth; bursa copulatrix without ribs or 

 bands. Genus: D/oc/o^^yme CoUet-Megret, 1802. 



Ancylostoma ceylanicum Looss, 191 1. 



f A . duodenale. 

 \A . caninum. 



. (A. ceylanicum. 

 \A. Malay anuM. 



PSEUDOSTRONGYLES Leiper, 1912. 



Family 15: Eustrongylidid^ Leiper, 1912. 

 Subfamily Dioctophymin^ RailHet. 



