DE. T. S. COBBOLd's STKOPSIS 01!" THE DISTOMIDiE. 



publicity was early given to its existence by Dr. Budd in the second 

 edition of his well-known treatise on " Diseases of the Liver." My 

 attention having been directed to this worm by Professor Busk 

 during the delivery of his lectures at the Royal College of Surgeons in 

 the summer of 1857, I have given the above description for the most 

 part in accordance with the specimen then and there exhibited. Von 

 Siebold has applied the term crassum to a trematode infesting Hirundo 

 urbica, but the species has, I believe, never yet been described. 



3. DiSTOMA HETEROPHYES (Sicbold). — CorpMS ovato-oblougum, sub- 

 tus planum, supra leviter convexum. Collum continuum. Os sub- 

 apicale terminale. Acetabulum ore majus, ventrale paululum ante 

 medium situm, globosum. Porus genitalis post acetabulum ven- 

 trale situs. Longit. ^ts^yo unc. ; latit. y^ unc. 



Distomum heterophyes, Bilharz and Siebold, Zeitsch. fiir Wissenschaft. 

 Zool. vol. iv. 1852, p. 62 and p. 455 ; also by Kuchenmeister with 

 details and figs. ; Diesing, Revis. p. 28. 



Hab. Dr. Bilharz of Cairo, in April 1851, discovered this minute tre- 

 matode in the small intestine of a boy, and again on a second occa- 

 sion under similar circumstances, when he collected several hundred 

 specimens. The part infested displayed a multitude of reddish points, 

 due to the presence of dark-coloured ova in the interior of the worms. 



4. DiSTOMA OPTHALMOBIUM, Dicsiug. 



D. ocuU liumani, Gescheidt. 



D. ophthalmobium, Diesing, Kuchenmeister, i. p. 222. 



Hab. Gescheidt found four individuals in the eye of a child five months 

 old, born with lenticular cataract. They were situated between the 

 lens and its capsule, and could be recognized as so many dark spots on 

 the surface of the lens. These are the only specimens that have ever 

 been seen. 



5. DiSTOMA LANCEA, Dicsing. 



D. lancea, Diesing, Syst. Helm. i. p. 334 ; et in Denkschrift. der k. 



Akad. der Wissensch. x. p. 64, cum figs. 

 Hab. Natterer found numerous examples of this elegant worm in the 



biliary ducts of a male Delphinus Tachuschi in December 1833, at 



Barra do Rio Negro in Brazil. 



6. DiSTOMA RUBENS, Dujardiu. 



D. rubens, Dujardin, Hist. Nat. des Hehninthes, p. 411 ; Diesing. 



D. exasperatuml Rudolphi. 



Hab. Found by Dujardin in the intestine oi Sorex fodiens (Daube7itoni) 

 in October, and in Sorex tetragonurus in April. If Rudolphi's fluke 

 be identical, as is probable, Bremser originally discovered this species 

 in the Square-tailed Shrew. 



7. DiSTOMA TENUICOLLE, Rudolphi. 



D- tenuicolle, Rudolphi, Dujardin, Diesing. 



