THE LEECHES OF JAPAN. 413 
Fic. 34.—A small individual found near Nikko. The median stripe is 
reddish brown, the lateral stripes are replaced with black. Transverse dark 
lines mark the limits of the somites. 
Fies. 37 and 39.—Two individuals from Tokio. 
Fic. 38.—An enlarged view (x 2) showing the segmental papille of both 
sides, and the position of the nephridial pores. 
PLATE XIX. 
Fies. 40—46.—Leptostoma acranulatum. 
Figs. 40, 43, 44, and 46.—Different patterns, taken from individuals found 
in Tokio. Natural size. 
Fic. 41.—Dorsal side of ten annuli, enlarged (x 4) to show the segmental 
papille and the exact pattern of the colour-markings. 
Fic. 42.—Ventral side of the same (x 4). The nephridial pores are about 
midway between the hind edge and the middle of the annulus. 
Fic. 45.—Rudimentary denticles. x 165. 
PLATE XX. 
Figs. 47—59.—Diagrams illustrating the abbreviated somites in several 
genera of Leeches. As it is one of the designs of these diagrams to show the 
topographical relations of parts and organs to the papillate annuli, it seems 
advantageous to regard the objects as transparent bodies, in which the genital 
pores, nephridial pores, &c., of the ventral side may be seen ir relation with 
the papille of the dorsal side. Remembering that the figures are constructed 
on this plan, no confusion between dorsal and ventral organs need arise. 
The annuli are numbered on the right of the figures, the somites on the 
left. The nephridial pores are indicated by the ordinals, the first pair 
being denoted by 1s¢ p.; the second, by 2d p.; &c. m. Two median papille. 
2. /. Inner lateral papilla. 0. 7. Outer lateral papilla. mg. Marginal papilla. 
p- Nephridial pores (lst—17th). g.c. Glandule copulative. m.o. Male 
orifice. f. 0. Female orifice. 6. Black spots. y. Yellow spots. /. Lateral 
papilla of ventral side. x Magnified. 
Fic. 47.—Anterior end of Hirudo medicinalis, from Sweden. x 2. 
Fic. 48.—Two rings seen from ventral side, showing position of papilla, 
pores, and distribution of the black pigment. x 2. 
Fic. 49.—Posterior end of the same individual, showing a fragment only 
of the 102nd annulus. xX 2. 
Fic. 50.—Posterior end of H. medicinalis, obtained from Sebeto River. 
VOL, XXVI, PART 3.—NEW SER. EE 
