NEMATODA 211 



des reins, 1841. Rayger, ' Sur un serpent qui sortit du 

 corps d'un homme apres sa mort ' (quoted by Davaine, 1. c., 

 p. 272), 1675. Schneider, ' Monographie der Nematoden/ 

 1866, s. 50. Idem (mit Peters), quoted by Leuckart, 1. c., 

 s. 382. Stratton, in 'Edin. Med. and Surg. Journ./ p. 261, 

 1843. 



Dochmius duodenalis, Leuckart. Much time might be occu- 

 pied and wasted over the nomenclature of this parasite. In 

 my previous treatise, and for reasons there stated, I placed it 

 under the genus Sclerostoma. On rather slender grounds 

 Dubini formed the genus Anchylostoma for its reception, but 

 Yon Siebold thought that, on account of the absence of sym- 

 metry in the arrangement of the so-called dental organs, 

 Dubinins genus might very well be allowed to remain. Bilharz, 

 Diesing, Kiichenmeister, Wucherer, and others have retained 

 the genus as either Ancylostoma or Anchylostomum. Schneider 

 keeps it amongst the Strongyli ; but after all that has been said 

 and written there can, I think, be no doubt that if Dujardin's 

 genus Dochmius is to be retained at all, Dubinins worm 

 must be placed in it. The comparisons instituted by Leuc- 

 kart afford sufficient proof of the intimate alliance as between 

 Anchylostoma and Dochmius. Professor Molin thought to 

 meet the difficulty by calling the worm Dochmius anchylos- 

 tomum, but the specific term, duodenale, should certainly be 

 retained. 



This worm was discovered by Dubini at Milan, and though 

 at first thought rare, it is now known to be tolerably common 

 throughout Northern Italy. The worm has also been recently 

 found by Dr Kundrata at Vienna, in an Austrian subject. 

 According to Pruner, Bilharz, and Griesinger, it is abundant in 

 Egypt. Griesinger believed that about one fourth of the 

 people of that country suffered from anaemic chlorosis, solely in 

 consequence of the presence of this worm in the small intes- 

 tines. From Wucherer's observations especially, we know that 

 Dubinins worm is not limited to the localities above mentioned, 

 for it occurs in the western tropics, in Brazil, and even in the 

 Comoro Islands. 



The worm may be described as a small nematode, the males 

 measuring f " or rather more, whilst the females extend to very 

 nearly " (12 mm.). The head is pointed and tapering, 

 and bent forward, having the mouth directed towards the 

 ventral aspect. The oral opening is armed with four asym- 



