288 DR. T. S. COBBULD ON HUMAN ENTOZOa. __[Nov. 25, 
11. Remarks ON ALL THE HuMAN Entozoa. By T. Spencer 
Cossotp, M.D., F.L.S., LecrureER on CoMPARATIVE ANA- 
tomy, ZoOLoGyY, AND Borany AT THE MippLEsex HospIiTAu. 
At the recent Cambridge Meeting of the British Association for 
the Advancement of Science, I adduced the following argument in 
favour of a more extended prosecution of experimental research in 
the department of human helminthology :—“ As man is infested by 
a great variety of internal parasites, and some of them prove exceed- 
ingly troublesome, it is evident that a large amount of practical good 
would ensue if we were more perfectly informed respecting the origin 
and economy of these creatures; for not only are our personal inter- 
ests directly affected by their intrusion, but we also suffer indirectly 
from the injury and destruction they occasion amongst our domesti- 
cated animals. At least thirty well-marked forms have been de- 
scribed as infesting the human body; and although most of the 
species are comparatively rare, yet a considerable number are exceed- 
ingly common in occurrence, and likewise often prove numerically 
abundant in one and the same individual.” 
This argument was supported by a reference to certain recently 
ascertained facts, a more particular account of which, combined 
with the results of my own inquiries, I now submit to the consider- 
ation of the Zoological Society. ; 
In the subjoined list I only record those which are perfectly di- 
stinct forms, and therefore probably good species. Many forms 
which were at first supposed to be distinct will be found in the 
synonymy placed at the head of each comment where the species is 
separately considered. The larvee are noticed under the titles of the 
adults to which they are either known or presumed to be respectively 
referable. This method is followed even in cases where the adult 
condition is not known to occur in the human body or in any other 
“host :” thus, for example, the Cysticercus acanthotrias is placed 
under Tenia acanthotrias, although the mature tapeworm at present 
remains unknown :— 
Human Entozoa. 
Fasciola hepatica, Linneus. 
. Distoma crassum, Busk. 
lanceolatum, Mehlis. 
ophthalmobium, Diesing. 
heterophyes, Siebold. 
. Bilharzia hematobia, Cobbold. 
. Tetrastoma renale, Delle Chiaje. 
. Hexathyridium pinguicola, Treutler. 
venarum, 'Treutler. 
10. Ascaris lumbricoides, Linnzeus. 
mystax, Rudolphi. 
12. Trichocephalus dispar, Rudolphi. 
13. Trichina spiralis, Owen. 
14. Filaria medinensis, Gmelin. 
OWNS HR w to 
