THE LEEOCHES OF JAPAN. 373 
considerably in different individuals in respect to the degree of 
development attained. 
3. Hirudinaria javanica (Hirudo javanica Wahl- 
berg).—Dr. C. Ph. Sluiter, of Batavia, has been kind enough 
to send me some very excellently preserved specimens of this 
interesting Leech, together with drawings aud full descriptions 
of the colour-markings. I have given the alcoholic specimens 
a thorough examination, and am able to add some facts to 
those communicated by Dr. Sluiter. 
This Leech resembles, in some respects, Hirudo maculosa, 
Grube,! but differs from it and from all other Medicinal 
Leeches known to me in two very striking peculiarities, 
namely, the separation of the sexual pores by seven 
instead of five rings, and the enormous size of its 
acetabulum, which reaches forward to the level of the last 
pair of nephridial pores. The first-named distinction alone 
appears to me quite sufficient to justify its separation from 
Hirudo, and it is on this ground that 1 propose to give it the 
generic name Hirudinaria. 
This genus agrees with Hirudo in the number and composi- 
tion of its somites, and in having precisely 101 rings between 
the first pair of eyes and the anus. The dividing line between 
the buccal rings (5th and 6th) extends to the ventral side, but 
vanishes before reaching the median line of this side. The 
post-buccal rings are somewhat more perfectly united on the 
ventral side. The male orifice les between the 30th and 31st 
ring, the female orifice between the 37th and 38th ring. The 
102nd ring, which forms a sort of neutral zone between the 
body and the posterior sucker, is broken into two lateral 
halves by the anus (fig. 56). 
The maxille are very large and the denticles unusually 
numerous (115—130). The inner angle of the maxilla (fig. 
60, 7) rises abruptly above the level of the csophageal fold 
which it terminates, and the lateral surfaces exhibit a consid- 
1 Ed. Grube, “ Anneliden,’’ in ‘Reise der Oesterreichischen Fregatte 
Novara um die Erde in den Jahren 1857—1859, Zoologie, Abth. 3, B. ii, 
Wien, 1868, pp. 39—40. 
