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long, and as thick as a swan quill, inhabits the duodenum especially, although it is found in other parts of the canal, sometimes in the large intestines. It attaches itself to the mucous membrane by the aid of its armed head, making numerous punctures, which are indicated by small swellings. When several worms exist in the intestines, the effects on the pig's constitution are very marked. The animal becomes emaciated, and in the morning, before feeding time, it exhibits signs of pain, groaning and restlessness being the chief symptoms. Probably the affected pig will feed with the others, but shows irritability by biting them if they molest it ; and, if attacked in return, it quickly falls exhausted. As to the degree of prevalence of the echinoryncus in swine in this country it is difficult in the absence of direct evidence to form any 8 opinion. The parasite is well known in France and Germany, and has been detected in pigs from the United States ; but even if it exists largely among pigs in this country it is not likely that it would be looked for. A nematode of considerable size, Ascaris suilla, is sometimes found in the small intestines of the pig. The worm very closely resembles the Ascaris lumbicoides of man, but is more slender. Two rare nematodes of small size, ^sophagostoma dentatum and Globo- cephalus mucronatus are referred to by some writers, but they are not recognised in this country. TKICOCEPHALUS CRENATUS is not uncommon in the cseclum and large intestines of the pig, and is only distinguished from the variety which is com- mon to the sheep by the presence of small spines on the spicule. The eggs contain embryos in a well developed form ; and, according to Leuckart, if they be introduced into the digestive canal of the pig, they are rapidly developed, and aquire the adult character in about four weeks.