THE LEECHES OF JAPAN. 415 
PLATE XXI. 
Fies. 60—71.—Reproductive Organs and Maxillz. 
Fic. 60.—Median dorsal maxilla of Hirudinaria javanica, seen in 
profile. There are from 115 to 120 denticles decreasing gradually in size 
from the inner (inferior in the natural position) angle (7.) towards the external 
(superior) angle (e.). The maxilla is thicker than the fold (f), to which it 
belongs; and its inner angle rises abruptly above the level of the fold. 
Rather large wart-like protuberances are seen on the lateral faces of the 
maxilla. x 50. 
Fic. 61.—One of the maxille of Leptostoma pigrum, showing no 
denticles, but only two series of irregular flattened plates, which are more or 
_less united, especially at the two angles (¢. and ¢.) where they bend into each 
other, thus completing the circuit of the outer edge of the jaw. These 
chitinous plates rest on a thick muscular welt (w.). x 130. 
Fic. 62.—An outline of the face of the jaw, showing that the plates are 
continuous, but weakly developed at the two angles (¢.and e.). Numerous 
small irregular chitinous pieces are scattered throughout the area inclosed by 
the larger plates. x 1380. 
Fic. 63.—A profile view of the maxilla of Leptostoma edentulum. 
The jaw here is so small that it scarcely deserves the name; it is the anterior 
end of the fold (7) slightly enlarged, and has no denticles nor any traces of 
even rudimentary plates. x 50. 
Fic. 64.—Reproductive organs of Leptostoma acranulatum. The 
male organ opens between the 6th and 7th ganglia (counting the sub- 
cesophageal as one); the female organ between the 7th and 8th. The 
ovaries have shifted their position from between the 7th and 8th ganglia to a 
point just in front of the 12th ganglion. The vagina and penial pouch are 
extremely long. x 4. @ Testis. vd. Vas deferens commune. vs. Vesicula 
seminalis (epididymis). @. ductus ejaculatorius. gp. Glandule prostatice 
p- Penial pouch (sacculus penis). o. Ovaries. gl. a/b. Glandule albumi- 
nifere. od. Oviduct. od. c. Oviductus communis. v. Vagina. 
Fic. 65.—Female organs of Hirudo nipponia. Letters as before. 
x 4. 
Fic. 66.—Female organs of Leptostoma edentulum. x 4. 
Fic. 67.—Female organs of Leptostoma pigrum. The vagina dif- 
ferentiated into a tubular and a saccular portion. The common oviduct. 
(od. c.) adheres closely with the saccular portion of the vagina. x 4. 
Fic. 68.—Female organs of Hemadipsa japonica. Here the com- 
