134 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
been used to term Amphistomum, and the name PARAMirHISTOMWAE 1 for the 
family to which they belong. Whether we follow the classification of Bronn's Thierreich 
or as I propose to do the later classification of Fischoeder, it is impossible to class the 
new human parasite described above as an Amphistomum,because that species is character- 
ized, amongst other things, by the absence of the lateral diverticula of the pharynx 
which form so characteristic a feature of our species. This fact, however, could only 
be determined by cutting the animal into sections, and therefore escaped the notice 
of Mr. CoNYNGHAM. 
Fischoeder divides the PARAMPH1STOMIDAE of the Mammalia into two 
sub-families — (i) the PARAMPHISTO MINAE with the genera Par -amphistomum , 
Stepbanopbarynx, and Gastrothylax, all these being devoid of pharyngeal side pouches, and 
(ii) the CLAD ORCHINAE with the genera C/adorchis, Chiorchis, Gastrodiscus, Homo- 
logaster, and Balanorcbis. Of these genns, Cladorcbis is characterized by having the 
body not divided into anterior and posterior portions, by having the lateral edges 
rounded, by having the ventral surface slightly hollowed, and in all these respects our 
genus agrees with C/adorcbis, and differs from the other members of the sub- 
family. I therefore place it in this genus. 
CLADORCHIS WATSONI (Conyngham). 
Synonym. Amphistomum watsoni (Conyngham). 
Length, 8-10 mm.; greatest breadth, 4-5 mm., tapering towards the anterior end 
to about 2 - 5 mm., and depth about 4 mm.; colour, when fresh, reddish yellow, when 
preserved, a dirty brown ; when fresh, translucent and gelatinous ; the ventral surface 
transversely wrinkled, the aperture to the posterior sucker small, but the sucker itself 
big ; no distinct sucker anteriorly but a well-marked pharyngeal bulb ; the two pharyn- 
geal pouches project beyond the outer limit of the bulb ; circular sphincter round the 
oesophagus just where it forks ; distinct genital papilla, testis lobed, divided into two, 
side by side, anterior to ovary ; Laurer's canal straight, opening anteriorly to excretory 
vesicle in middle line above the posterior sucker ; the latter is very large and vaulted, 
the ova measure from 122.130 m X 75-80^. 
Habitat. Homo sapiens^ a West African negro, jejunum and duodenum, very 
few in the large intestines. 
1. Zool. Jahrh. Sysf, xvii, 1903, p. 485 -v. also Zool. Auz., 1900, p. 367. 
