STUDIES OX THE ECTO PARASITIC TREMATODES OF JAPAN. 255 



network ; genital atiinm armed with straight 



spines consisting of a hemispherical, basal por- 

 tion and a straight, spinous, distal portion... M. reticulata, p. 189. 

 ^^5 Body .'symmetrical, slender, about 3.3 mm. 



long ; caudal disc not distinctly separated from 



the body proper, very short, isosceles-trape- 

 zoidal, with about 10 suckers on each side ; 



genital atrium armed with 20 long, chitinous 



rods arranged in a circle M. truncata. p. 191. 



"6 Body symmetrical, fusiform, about 2 mm. long ; 



caudal disc not separated by a constriction from 



the body proper, nearly h the total length of 



the body, with about 80 or more suckers on 



each side ; genital atrium armed with short, 



conical spines M. fusiform is. p. 192. 



^■" Body symmetrical, anterior portion slender but 



the remaining portion broader, about 4.2 mm. 



long ; caudal disc not separated from the body 



proper by a constriction, »with about 30 



suckers on each side ; genital atrium with a 



cup-shaped organ, the internal surface of which 



is covered with straight, conical spines con- 

 sisting of a hemispherical, basal and a spinous, 



distal portion M. chiri. p. 193. 



"^ Body prominently asymmetrical, slender, about 



4 mm. long ; caudal disc slender and pointed at 



the end, making an angle with the body proper, 



with about 75 suckers on one side and GO on 



the other ; genital atrium with a bell-shaped 



organ, and armed witli two sets of slender, 



chitinous rods, one of which is hook-shaped 



and short, and the other slightly curved and 



long M. sciaenae. p. 194. 



i - Body always symmetrical ; with a pair of spheroidal 

 suckers within the mouth, and with four pairs of 



