STUDIES OX THE ECTOPARASITIC TREMATODES OP JAPAN. 227 



t e r i o r e n d , at the apex o f av h i c h is a 1 1 a c li e d a 1 a r g e , cir- 

 cular, saucer -shaped sucker, the cavity of which is 

 divided by means of elevated, radial spokes into a central 

 heptagonal area and seven quadrangular, peripheral areas, 

 the most posterior of which is larger than the others and 

 occupies the median line of the body, while the rest is 

 symmetrically disposed on the two sides. With a pair 

 of hooks imbedded in the radial spokes that bound the 

 hindmost peripheral area. Mouth subterminal and 

 ventral, with a rudimentary sucker just behind it. 

 With a paired vaginal opening on the ventral side of the 

 body. Common genital opening median and ventral. 

 AVith a tubular, chitinous penis. 



1. Calicotijle MitsulairiP, n. sp. 

 (PI. XIX.) 

 Bodij very fltit, ovate, about 8 mm. long and 5 mm. broad. Pos- 

 tcrior sucker sessile, large, having a diameter equal to about one-third 

 the whole length of the body; with seven, small notclies at the 

 peri[)hcry corresjwnding to eacli radial spoke ; central area of the 

 sucker situated a little in front of the true centre of the sucker ; 

 the sucker projecting l^eyond the p(3sterior end of the body proper 

 by about one-third of its diameter. Hooks very st(jut, hollow in 

 its distal portion equal to about one-fourth its whole length ; str(jngly 

 recurved at the end ; of the form represented in fig. 5, PJ. XIX ; 

 0.56 mm. long (curvature not reckoned). Anterior end <jf the l^ody 

 rounded ; with two pairs of hollow, goblet-shaped .s//c7.-// (//c(/^?.'5 opening 

 by their long necks at the anterior end on each side (jf tlie juedian 



1). Dedicated to Kakichi Mitsukuri, Ph. D., Eigahiuiahu^hi, Professor of Zoology 

 in the College of Science, Imperial University, Tokyo. 



