ON A NEW SPECIES OF MALACOBDELLA (M. JAPONICA). 



Ill 



commissure gives off numerous branches internally and externally, and 

 together with the several big twigs from the larger commissure 

 innervate the acetabulum. The ganglionic cells are found in the larger 

 acetabular commissure. 



Thus the Japanese species of Malacobdella mainly differs from M. 

 grossa by its short rhynchocoslom, by its possessing the acetabular, 

 instead of an anal, commissure, and by some differences in the vascular 

 system. These data, I think, are enough to separate the present 

 species from M. grossa. 



July 1897. 



