408 PARASITES OF ANIMALS 



amongst the layers of fat in a Chinese race of Sus scrofa 

 domestica. The males measure from ten to thirteen lines long, 

 the females from fifteen to eighteen lines, the former being 

 scarcely a line in breadth at the middle of the body, whilst the 

 latter are almost a line and a half in thickness. The curved 

 body thickens towards the tail, is transversely annulated, and 

 viewed with a penetrating lens is seen to be furnished with 

 integumentary pores. The oral aperture opens widely. It is 

 almost circular, and is supplied with six teeth at the margin. 

 Two of these standing opposed to one another are larger and 

 stronger than the rest. The tail of the male, when spread out 

 evenly, is surrounded by a coronet of five lancet-shaped flaps ; 

 the combined flaps being connected together from base to apex 

 by means of a delicate transparent membrane. The single 

 spiculum situated at the extreme end of the tail projects slightly 

 forward and is surrounded by three skittle- shaped bodies. 

 The tail of the female is curved upon itself, rounded off, and 

 drawn out at the extreme end into a straight beak-shaped 

 point; whilst to both sides of the stumpy caudal extremity of 

 the body short vesicular prominences are attached. The female 

 reproductive outlet occurs at the commencement of the second 

 half of the body. Thus, judging by its external characters this 

 genus is most closely allied to Strongylus." In reproducing 

 Diesing's description I have here rendered the translation 

 somewhat more freely than in my previous record of the dis- 

 covery given in 'Nature' (1871). The original description is 

 supplemented by a brief account of the internal anatomy of 

 the worm. 



So far as I am aware no subsequent notice of this entozoon 

 appeared until the year 1858, when Dr J. C. White gave some 

 account of a " find " made in the United States. This re-dis- 

 covery was reported in the sixth volume of the ' Proceedings of 

 the Boston Natural History Society/ Dr White says : " The 

 worms were found in the leaf-yard of an apparently healthy hog, 

 in the adipose tissue near the kidney. They occupied a space of 

 the same about the size of a man's fist and had burrowed through 

 the mass in every direction, forming canals three or four milli- 

 metres in diameter, which terminated in cysts. On cutting open 

 these cavities, which did not communicate with each other, they 

 were found filled with pus, and in each were two worms, male 

 and female." Dr White expresses his opinion that the worms 

 gained access to the tissues " by boring through the circulatory 



