92 THE INTERNAL PAEASITES OP 



worm (Trichina spiralis) has frequently been reared both 

 in the intestines and muscles by experiment. The blood 

 infesting thread worm of Grube and Delafond (Filaria 

 hcematica) is probably a distinct species ; and the same 

 may possibly be said of Gescheidt's small nematode 

 (Filaria trispinulosa) discovered in the eye. There are 

 also the small thread worms found by Mr. T. Mather, 

 V.S., in the liver ducts and substance of the gland, as 

 well as in cysts within the walls of the intestines. Pro- 

 visionally I find it convenient to recognise Mr. Mather's 

 parasites under the distinctive and combined title of 

 Filaria hejoatica. It is a great pity none of the specimens 

 were preserved, but my hope is that fresh examples may 

 be discovered before very long. 



Lastly, there is another canine haematozoon, the males, 

 females, and embryos of which, according to Professor 

 Leiserung, occur in the venous blood of certain parts of 

 the body of the dog. The learned pathologist denominates 

 this parasite Hcematozoon suhulatum. As the very general 

 and generic term here employed is not likely to find 

 acceptance with helminthologists ; and as, moreover, 

 Leiserung' s figure and description of the male seems to 

 connect the parasite with the strongyloid group of worms, 

 I believe that the generic and specific title Strongylus 

 subulatus will be found to be more appropriate. 



I am indebted to Dr. Schliep, of the London German 

 Hospital, for drawing my attention to Professor 

 Leiserung' s discovery and original paper on this subject, 

 which is contained in Virchow's Archiv, for 1865 ; and, 

 as I had no ready means of access to the journal, Dr. 

 Schliep also obligingly furnished me with an abstract of 

 the paper. Professor Leiserung, it seems, at first sup- 

 posed that his minute subulate strongles were identical 



