04 EXTOZOA OF RATS AND MICE. 



but regarded it as Trichocephalus nodosus. the whij) Avorin 

 which frequents the caecum, as did Kitt in 1880. In 1889 

 Railliet gave an account of the lesions and the eggs as well 

 as of a series of experiments carried out with the latter with 

 a view to tracing the life history. He believed that the 

 ])arasite w^as a Trichosotna jjeculiar to the liver and distinct 

 fi'om the species of the genus which were known to occur 

 in the intestine of Muridje. 



In the same year he and Lucet (Railliet and Lucet 

 1889) investigated the ver)ninous tumours of the liver of the 

 hedgehog, Erinaceus europceus L. and fomid them to be 

 due to the presence of a Trichosoma distinct from those 

 then known from that host. 



In 1889 Bulloch referred to the presence of eggs in the 

 liver of a rat in the United States and believed them to 

 belong to Trichocephalus dispar. In 1893 Perugia* wrote 

 upon the Trichosoma, while in the following year Dr. T. L. 

 Bancroft published his account of the Avorm (which he named 

 Trichocephalus hepalicus) and gave an interesting account of 

 his efforts to trace the life history. He also desci'ibed the 

 pathology of the infection. 



In 1898 Magalhaes referred to the })resence of eggs of 

 a Trichosoma in verminous tumours *of the liver of Mus 

 decumanus in Brazil (1898, p. 316). In the same year 

 Railliet labelled the parasite as Trichosoma hepatica 

 (Bancroftf.) A little later Bossuet (1902, p. 192) gave an 

 account of the Avork done by Railliet l)ut did not add many 

 new facts. 



In 1901 Galli-N'^alerio referred to the presence of the 

 parasite in tAvo Mus decumamfs in SAvitzerland.J and in 

 1903 gaA'e a short account of the pathology of the invasion 

 (1903, p. 88). In 1905 he referred to the occurrence of 



*Peiugia. Sul Trichosoma del fegato dei iiuiridi. Atti Soc. Ligiist. 

 di sc. nat., Gcnova, 4, 1893, pp. 20(5-210 (quoted by Hall, J 910). 



■f Railliet. Rectification de la iiuiiienclatiiie d"apies jcs liavaux 

 receats. Roc. ined. vet. Paris, To, 1898. ]>]). 171-174. ((]>ioted hy Hall, 

 1910). 



|Galli-Valerio B. La collection de parasites dn jaboratoire d" hvgiene 

 et de parasitologic de 1' Universite de Lausanne. Bull. Soc. \'aud. d. sc. 

 lat. Lausanne, (140), 37, 1901, pp. 343-381. 



