412 C. O. WHITMAN. 
Fic. 16.—Similar views of another individual from the same locality, in 
which the lateral stripes are nearly obsolete. 
Fic. 17.—A middle-sized individual from Tokio, in which the inner lateral 
yellow stripes have been replaced by black stripes, each of which represents 
two dark borders united. 
Fie. 18.—An individual in which the yellow stripes have all been replaced 
by black stripes. 
Fie. 19.—A typically coloured specimen. 
Fie. 20.—An unusually dark variety, in which the yellow stripes are con- 
tinuous, or nearly so. 
PLATE XVIII. 
Fics. 21—27.—Leptostoma pigrum. 
Fic. 21.—An outline figure showing the whole number of annuli, the 
precise arrangement of the yellow pigment spots, the position of the genital 
pores, rings embraced in the clitellum, and the number of abbreviated 
somites—five at the anterior end, and three at the posterior end of the body. 
Fic. 22.—The same coloured. Natural size. 
Fie. 28.—Another individual, which shows the typical arrangement of the 
yellow spots in specimens found in the neighbourhood of Tokio. 
¥ice. 24.—Dorsal (d.) and ventral (v.) view of the Yezo type. Specimen 
obtained from a small lake (Junsainuma) near Hakodaté. 
Fie. 25.—A Tokio pattern, in which the median spots are absent. 
Fie. 26.—Another, in which the spots are all very small, the median ones 
being almost obliterated. 
Fic. 27.—A dorsal and a ventral view, showing the position of the seg- 
mental papille and the nephridial pores. X 3. 
PLATE XIX. 
Fies. 28—39.—Leptostoma edentulum. 
Fic. 28.—Dorsal view of a large individual, slightly extended. 
Fie. 29.—Ventral side of the same. 
Fic. 30.—Dorsal and ventral side of ten middle annuli. Five stripes 
present ; the lateral stripes narrow, and brownish yellow. 
Fic. 31.—Similar views of a specimen from Aomori. 
Fies. 32, 33, 35, and 36.—Similar views of Tokio specimens, showing 
different shades and patterns, 
