OBSERVATIONS ON A NEW TAILLESS CERCARIA. 455 
On examining it with the microscope, it was seen to be a 
not fully-developed distoma (tailless Cercaria), the de¬ 
scription and drawing of which I here subjoin. It has an 
Cercaria incisticlata , Perr. 
approximative shape to Siebold and Bilharz’s distoma 
Heterophies, a maximal length of 3*496 mm., and a maximal 
breadth of 1*596. Two suckers, one anterior, the other 
ventral. The transversal diameter of the superior sucker is 
0*404, the longitudinal 0*352; the longitudinal diameter of 
the opening 0*168, the transversal one 0*152. The ventral 
sucker, too, has an ovular shape, with a longitudinal diame¬ 
ter of 0*500 mm., the transversal one of 0*448; the trans¬ 
versal diameter of the opening 0*260, and the longitudinal 
0*188. For its inferior part, and on the right side, is situated 
an organ, tortuous at its basis, which continues horizontally 
and on the same side, then rises aloft and becomes thinner 
and thinner, till it loses itself in proximity to the semi¬ 
lunar body. 
Between the two suckers is found a yellow body of a 
peculiar form, probably representing a very large, strong, 
and muscular pharynx. It has the transversal diameter of 
0*272 mm., the minimal longitudinal one 0*160, the maxi¬ 
mal 0*184. 
Laterally, on the right of, and above the ventral sucker. 
