20 PARASITES OF MAN 



spine or tooth, and it is most probable that the higher larvae 

 are similarly armed. 



BIBLIOGRAPHY (No. 4). Kichner (see Leucltart) , quoted above. 

 Cobbold, 'Entozoa' (p. 187). The case byBucholz (reported 

 as one of Fasciola hepatica) is given by Jordens in his work 

 (quoted by Diesing and Leuckart) f Entomologie und Helmin- 

 thologie des menschlichen Korpers ' (s. 64, tab. vii, fig. 14), 

 1802. Chabertfs French case is quoted by Rudolphi in his ' Ento- 

 zoorum sive vermium,' &c. (loc. cit., Bibl. No. 1), p. 326, 1808. 



Distoma crassum, Busk. This large species was originally 

 discovered by Prof. Busk in the duodenum of a Lascar who 

 died at the Seamen's Hospital, 1843. It, however, remained 

 undescribed until 1859, when, with the discoverer's approval, I 

 gave some account of it to the Linnean Society. 



Of the fourteen original specimens found by Mr Busk, 

 several have been lost. The one that he himself gave me 

 I handed over to Prof. Leuckart, and it is figured in his 

 work (' Die mensch. Par./ s. 586). A second is preserved in the 

 museum attached to the Middlesex Hospital, and a third is con- 

 tained in the Museum of the Royal College of Surgeong. This 

 last-named specimen is the best of the original set. It supplied 

 me with the few details of structure figured in outline in my 

 'Introductory Treatise' (fig. 42, p. 123), published in 1804; 

 and it also in part formed the basis of the description of the 

 species communicated to the Linnean Society in June, 1859 

 ("Synopsis of the Distomidas," p. 5, 'Proceedings,' vol. v). 

 The late Dr Lankester, it is true, was the first to give a dis- 

 tinctive title to this entozoon (Distoma Buskii) ; but as the 

 discoverer objected to this nomenclature, and as Dr Lankester's 

 proposed terms were unaccompanied by any original description, 

 I requested Mr Busk to suggest a new name for the worm, 

 which he accordingly did. As I subsequently pointed out, Von 

 Siebold had already employed the compound title Distoma cras- 

 sum to designate a small fluke infesting the house-martin 

 (Eirundo urlica) ; but for reasons similar to those which con- 

 tributed to set aside Dr Lankester's nomenclature, the title 

 adopted in my synopsis at length came to be recognised by 

 Leuckart and by other well-known helminthologists. Before 

 this recognition took place, Dr Weinland, of Frankfort, had so 

 far accepted Lankester's nomenclature as to call the species 

 Dicroccelium Buskii. In my judgment there are no sufficient 

 grounds for retaining Dujardin's genus. Further, 1 may 



