RECENT WORKS ON THE ENTOZOA. 341 



Trematoda, three on the Nematoidea^ one on the Acanthocephalaj and 

 two on the Cestoidea. Thus Part I. is completed. 



Part II., entitled 'Special Helminthology,' is devoted to "an 

 outline of the anatomical peculiarities, origin, mode of development 

 and propagation of the Entozoa infesting Man ; with a particular 

 account of the injurious effects they produce, including a brief notice 

 of the remedies employed in medical practice." This Part occupies 

 the greater moiety of the volume. 



The internal parasites of man were estimated by Professor Owen,* 

 in 1855, as *' not fewer than eighteen " in number, fourteen of 

 these being " good and well-established species of Entozoa.*' 



Three years later, Dr. Weinland, in his '* Systematic Catalogue 

 of all Helminthes found in Man,"f enumerated so many as thirty- 

 two species of human Entozoa. Six, however, of these were charac- 

 terised as " doubtful," and twelve others, as " imperfectly known," 

 so that there remained, as in Professor Owen's estimate, but four- 

 teen admissible specific forms. 



The following is Professor Owen's list,}: in a slightly revised 

 form : — 



1. Echinococcus hominis. 



2. Tcenia solium j 



(including Cysticercus ceUulosce.) 



3. Bothriocephalus latus. 



4. Distoma hepaticum. 



5. Distoma lanceolatum. 



6. Trichina spiralis. 



7. Filar in medinensis, 



8. Eilaria oculi humani. 



9. Filaria hroncldalis. 



10. Trichocephalus dispar. 



11. Sjnropter a hominis. 



12. Strongylus gigas. 



13. Ascaris lumbricoides. 



14. Oxyuris vermicularis. 



With the exception of Spiroptera hominis, which the recent re- 



* Second Edition of his Lectures on the Invertebrate Animals. 



•j- Forming the "Appendix" to his "Human Ccsioides — An Essay on the Tape- 

 worms of Man," 1858. 



X We have compiled this list from his * Lectures.' An earUer catalogue will be 

 found in the article ♦ Entozoa,' — Todd's Cyclopeedia (Vol. IL} 



