284 DB. T. S. COBBOLD ON ENTOZOA IN THE DOG. 



distinctly indicated the presence of this parasite in dogs dying or 

 destroyed in this country ; but it appears to be tolerably frequent 

 in Prance and Grermany. I believe it to be identical with the 

 round- worm, which is known to be common in China and not unfre- 

 quently to cause the sudden death of its canine host. Some years 

 ago a manuscript was placed in my hands, giving a detailed account 

 of the ravages inflicted by these parasites ; but I fear the paper 

 has been irretrievably lost. Dr. Hughes Bennett, of Edinburgh, 

 has in his possession a Chinese dog's heart which had burst 

 during life from the pressure occasioned by a large number of 

 these parasites lodged in the ventricles. In the year 1813 a 

 round worm, probably referable to this species, was found in the 

 heart of a dog at Paris ; and there is some probability that the 

 microscopic hsematozoa, first discovered by Grube and Delafond 

 in the blood of dogs, are genetically related to this species. I 

 shall again have occasion to remark upon this point *. 



3. Dochmius trigonoceplialus . — This small parasite is probably 

 not uncommon in this country, but it is either frequently over- 

 looked or disregarded on account of its apparent unimportance. 

 It is not likely that the migrating progeny are the source of the 

 verminiferous condition of the blood just alluded to. Its pre- 

 valence is certainly very variable in difterent countries or districts ; 

 but the only accurate observations bearing upon this point are 

 those given by Dr. Krabbe in his recent Danish workf- Out of 

 500 dogs which he had examined (after death) at the Royal 

 Veterinary and Agricultural College at Copenhagen, only nine 

 contained this parasite, whilst in 100 dogs dissected in Iceland it 

 was entirely wanting. His experience, as regards its prevalence 

 in other members of the canine race, coincides with that of db- 



* Since this paper was announced I have received a letter from Dr. Jones 

 Lamprey (Surg. 67th Reg.), confirming the facts above mentioned. Writing on 

 the 15th inst., he says: — "I take the Uberty to inform you that I have found 

 some remarkable entozoa in the cavities of the liearts of dogs in China, which I 

 have sent to the Museum of the Army Medical Department at Netley, together 

 with an account of them. I do not believe they have been, as yet, described." 

 I (Dr. C) may also add that since this paper was read I have reexamined Prof. 

 Bennett's preparation, and, by his pei'mission, have removed and retained one 

 of the parasites. It measures exactly 10 inches in length. — T. S. C. 



t Helminthologiske Undersogelser i Danmark og pad Island, med sjeligt 

 Hensyn til Blffireormlidelserne paa Island. Af Dr. med. Krabbe. Kjoebenhavn, 

 1865. [The above facts are taken from the Danish work ; but Dr. Krabbe has 

 since brought out a Erench edition of his treatise, and has likewise, through 

 M, Blanchard, communicated a resume of his researches to the French Academy. 

 ^T. S. C] 



