THE LEECHES OF JAPAN. 411 
EXPLANATION OF PLATES XVII—XXI, 
Illustrating Mr. Whitman’s Paper on “The Leeches of 
Japan.” 
PLATE XVII. 
Fies. 1|—9.—H emadipsa japonica and H. ceylanica. 
Fics. 1 and 2.—Dorsal and ventral view of H. japonica at rest. Natural 
size. 
Fies. 3 and 5.—Similar views of another individual in extension, showing a 
different colour. Natural size. 
Fic. 4.—Dorsal view of another individual, partially filled with blood (in 
extension). Natural size. 
Fic. 6.—The anterior end of Fig. 1, magnified 10 diameters, showing the 
position of the eyes and their serial homology with the median and lateral 
segmental papille. 
Fic. 7.—The posterior end of the same individual, magnified 5 diameters. 
Figs. 8 and 9.—Dorsal and ventral view of H. ceylanica. Natural size. 
PLATE XVIII. 
Fies. 1]0—20.—Hirudo nipponia. 
Fie. 10.—An outline figure of the Leech represented in Fig. 18, showing 
the whole number of annuli, the arrangement of the eyes and segmental 
papille, the distribution of the dark pigment, the position of the first (13th 
annulus) and last pair (93rd annulus) of nephridial pores, and the position of 
the genital openings (between the 30th and 31st and the 35th and 36th 
annuli), xX 2. 
Fies. 11—13.—Fig. 11 is a dorsal, and Fig. 13 a ventral view of a middle 
portion of the Leech represented entire in Fig. 12. Figs. 11 and 13 are 
magnified 4 diameters. 
Fie. 14.—A much faded individual, in which the five stripes are only faintly 
indicated. Natural size. 
Fic. 15.—A dorsal (d.) and a ventral (v.) view of two middle somites of a 
Leech from Aomori. 
