Drs Lewis and McConnell’s description of the worm is too long to be quoted in full. The parasites measure 1/5″ to 1/3″ in length, by 1/8″ to 1/6″ in breadth. Science is much indebted to these eminent observers for having unearthed the museum specimens and for recording the facts they could gather. From a zoological point of view the most interesting fact connected with Lewis’s amphistome is the existence of a gastric pouch. This structure brings these human _Masuri_ into close relation with the equine parasite which I have named _Gastrodiscus Sonsinoii_, and which will be found illustrated in this work (fig. 62). In short, Lewis’s worm appears like a transition form; the absence of gastric supplementary suckerlets separating it from the new generic type. BIBLIOGRAPHY (No. 11).--_Lewis, T. R., and McConnell, T. F. P.,_ “_Amph. hominis_; a new parasite affecting Man,” ‘Proceedings of the Asiatic Society of Bengal,’ Aug., 1876. _Bilharzia hæmatobia_, Cobbold.--This remarkable parasite was discovered by Bilharz in 1851. It was subsequently found by myself in an ape (1857); other species of the same genus having since been detected by Sonsino in the ox and sheep (1876). The human examples were originally obtained from the portal system of blood-vessels. Afterwards they were obtained by Bilharz, Griesinger, and others, from the veins of the mesentery and bladder. It was shown that they were not only associated with, but actually gave rise to a formidable and very common disease in Egypt. In 1864 Dr John Harley made the interesting announcement that he had discovered specimens of this singular genus in a patient from the Cape of Good Hope. He also showed that the entozoon was the cause of the _hæmaturia_ known to be endemic at the Cape. Harley believed his parasites to represent a new species (_Distoma capense_), but in this view I showed that he was mistaken. His admirable contribution, nevertheless, served not only to establish the wide range of this parasite on the African continent, but also to throw much light upon the subject of endemic helminthiasis. As this worm forms an almost altogether exceptional type of fluke-structure, it became necessary to supersede the original nomenclature proposed by Bilharz and Von Siebold (_Distoma hæmatobium_). Accordingly I proposed the term _Bilharzia_, whilst other helminthologists subsequently proposed various titles (_Gynæcophorus_, Diesing; _Schistosoma_, Weinland; _Thecosoma_, Moquin-Tandon). On various grounds, and chiefly on account of priority, most writers have at length definitely accepted the nomenclature which employed the discoverer’s name for generic recognition. [Illustration: FIG. 7.--The blood fluke (_Bilharzia hæmatobia_). The lower end of the female is withdrawn from the gynæcophoric canal of the male. After Küchenmeister.]