PARASITES OF ANIMALS. 337 



In the worst cases the accumulation of worms and ova in 

 the huig tissue produces an extensive inflammation of these 

 organs and renders all treatment unavailing. This has been 

 treated by blistering, wine, &c., but rarely with any measure 

 of success." 



The Strongylus of the E.og's Intestines ^ (^Sclerostomum denta- 

 lum Rud.) See p. 241, Report for 1870. 



In the last report this species was erroneously described as 

 a true Slrongylus, owing to the probable occurrence of two 

 different but related species in the hog's intestine, one of 

 which is probably a true Strongylus and the other a Sclerosto- 

 nmm. The original species described by Rudolphi appears 

 however to belong to the genus ScWostomum. According to 

 Diesing, it had the following characteristics, some of which 

 differ from the description given in the Report for 1869. 



Head truncate ; border of the mouth with ten or twelve 

 small recurved teeth. Body straight, tapering to both ends. 

 Bursa of the male three-lobed, the intermediate lobe smaller ; 

 rays three, undivided. Caudal extremity of the female 

 straight, subulate, the genital aperture above the apex of the 

 tail. Length of the male, 5 or 6 lines ; of the female 6 to 7 

 lines ; diameter one-fourth of a line. 



The '■^Kidney-ivorm''^ or ^^ Lard-ivorm^^ of the Hog. (^Slephan- 



urus dentatus Diesing, or Sclerostoma pingiiicola V, 



Report for 1870, p. 248.) 



Since the publication of the last report much additional 

 information has been obtained concerning this destructive 

 pnrasite, which proves to be one of the most abundant and 

 widely diffused of all those infesting domestic animals. It is 

 also probable that it annually causes greater pecuniary loss 

 than any other parasite. 



Soon after the publication of my description of this worm 

 in the last report, and also in the American Journal of Science, 

 my attention was called to several other cases in New England. 

 In one of these, numerous large specimens were found in the 

 leaf-lard of a pig raised in Litchfield county, in this state. 

 22 



