53^ F athological Significance of Nematode Hcematozoa. [part hi. 



cordis* we find it stated (in addition to the various anatomical details common to 

 the Filaridae, among others that the caudal extremity of the male is provided with 

 ''a row of five tubercles and a narrow ala upon each side") that the length of the 

 female is 10 inches, and the breadth i a line ; length of male 5 inches, and the 

 breadth :^ of a line. The Professor continues — " Mr, Joseph Jones lately presented to me 

 two specimens of the heart of a dog, in the right ventricle of one of which there 

 were five of the Filarise just described. In the other specimen the right auricle and 

 ventricle and the pulmonary artery in its ramification through the lungs are literally 

 stuffed with Filarise," A portion of the blood of this dog contains a great number of the 

 young of the Filarise. Both these animals are referred to as being very lean — one is 

 described as being " so thin as to resemble a skeleton, and it was impossible to 

 benefit his condition with the most liberal supply of food."t 



Mr. Leidy does not give the minute anatomy of these Filarise, nor does Schneider, 

 whose description generally coincides with that of Leidy, and accurately so with 

 reference to the caudal extremity of the male }) ; but the omission as to the micro- 

 scopical characters of the worm has been so exhaustively supplied by Dr. Welch, 

 Assistant- Professor of Pathology at Netley,§ and by Professor Cobbold,|| that there can 

 be no possible excuse for future workers in this field of research to confound totally 

 distinct Entozoa. 



It should be noted that the mature worms discovered in France, China and 

 America are described as being found in the cavities of the right side of the heart 

 and vessels of the venous circulation. 



Dr. Cobbold has also recently called the attention of English readers to a paper 

 in Virchow's Archiv for 1865, by Professor Leiserung, on the existence of minute, 

 though mature, parasites in the venous blood of certain parts of the circulation of 

 dogs— males, females and embryos being found. The female worms (presumably 

 larger than the male) did not exceed y^th of an inch in length and the free embryos 

 averaged y^g'^th. Dr. Cobbold considers the parasites to belong to the strongyloid group 

 of worms and has given other particulars concerning them in his lately published 

 excellent manual " On the Internal Parasites of our Domesticated Animals," — a work 

 which I regret, is not at present in my possession, as I am thus obliged to fall back 

 upon the few hasty notes which were made whilst perusing the volume a few weeks 

 ago for the particulars just given of Leiserung's observations. 



The foregoing paragraphs contain the leading features of all the information 

 which I have been able to glean with reference to the existence of Hsematozoa in 

 dogs: I could find no allusion whatever to any such condition being manifested by 

 dogs in India. 



* Proc, Acad., Nat. Science, Philadelphia, vol. V, 1850-51, pp. 17, 18. 

 t Op. at., vol. Vin, 1856, p. 55. 

 X Monographic der Nematoden, 1866, p. 87. 

 [/ § Monthly MicroscopicalJournal, October 1873, pp. 157— 170. 



II Proc, Zoological Society, T>ondon, November 1873, pp. 738—741. 



