100 PARASITES OP MAN 



Tania nana, Siebold. As regards the dwarf tapeworm, 

 unless Spooner's case be genuine, there is but one solitary 

 instance on record of its occurrence in the human body ; more- 

 over, we have no evidence of its having existed in any other 

 host. It was discovered by Dr Bilharz, of Cairo, at the post- 

 mortem examination of a boy who died from inflammation of 

 the cerebral membranes. Prodigious numbers existed. The 

 largest specimen measured only one inch in length. To the 

 naked eye these worms resemble short threads, and conse- 

 quently they might very readily be overlooked. The head is 

 broad and furnished with a formidable rostellum armed with a 

 crown of hooks. These hooks have large anterior root-processes, 

 which, extending unusually forward, impart to the individual 

 hooks a bifid character. By far the best account of this worm 

 is furnished by Leuckart, to whom I am indebted for a 

 specimen. 



BIBLIOGRAPHY (No. 17). Colloid, ' Entozoa/ p. 244. 

 Davaine (1. c. f Bibl. No. 2), p. 574. Heller, 1. c., s. 606. 

 Kuchenmeister, 1. c., Eng. edit., p. 141. LeucJcart, 1. c., Bd. i, 

 s. 893. Von Siebold and Bilharz, in Von Sieb. and K611. 

 Zeitschr., Bd. iv. Spooner, f Amer. Journ. Med. Sci./ 1873. 

 Van Beneden, ' Iconographie/ 1. c., pi. iii, fig. 17. Weinland, 

 * Diplacanthus nanus,' 1. c., p. 85. 



Tania Madagascariensis, Davaine. This appears to be a 

 well-defined species although the head has not yet been seen. 

 It probably forms the type of a distinct genus. Dr Grenet, 

 stationed at Mayotte (Comores), twice encountered single 

 specimens passed by two young children, eighteen and twenty- 

 four months of age respectively. The proglottides have their 

 genital pores uniserially arranged, and they show, in their 

 interior, remarkable egg-capsules, from 120 to 150 in number 

 in all, each containing from 300 to 400 eggs. These give a 

 long diameter of gj/ 7 for the outer envelope and ~^' for the inner, 

 or shell proper. The embryo measures only the ^ of an inch. 



A full account of this parasite, with figures, is given by 

 Davaine (' Les Cesto'ides/ 1. c., Bibl. No. 2, p. 577 et seq.). 



Tania marginata, Batsch. Although I possess no certain 

 evidence of the occurrence of this parasite in its adult condition 

 in the human bearer, yet there is a tapeworm in the Edinburgh 

 Anatomical Museum referable to this species, which was said 

 to have been obtained from the human body. This worm is 

 very common in the dog. 



