388 Cc. O. WHITMAN. 
Habits.—Active, easily provoked to swim. Food unknown. 
Internal Organs.—The female organs (fig. 66, Pl. 
XXI) are in every respect similar to those of H. nipponia. 
The vagina is sometimes on the right, sometimes on the left of 
the nerve-chain. 
The stomach is a narrow straight tube, with no distinct 
division into chambers, with two long slender diverticula at 
the posterior end. ‘The intestine is divided into three regions 
of nearly equal length. The first is much wider than the 
stomach, and is divided into four chambers; the second is a 
narrow middle piece with a single coil; the third is a dilated 
fusiform end piece. 
The dermal glands are larger and more numerous on the 
dorsal than on the ventral side. 
The nephridial vesicles are large, and lined with a ciliated 
epithelium. The cilia appear to be absent in the region 
which leads into the efferent duct. 
This beautiful little Leech agrees with a few forms found 
elsewhere in having no denticles; but this character appears to 
me to have comparatively little value as a generic distinction ; 
certainly, much less than the number of its abbreviated somites, 
which links it with L. pigrum and L. acranulatum. 
Toothless leeches have been found in various and widely- 
distant parts of the earth, which, so far as the descriptions go, 
differ from one another in important particulars. Philippi? 
describes a gigantic leech (?) from Valdivia, under the name of 
Macrobdella valdiviana, which has neither eyes nor jaws. 
Grube? has described a curious subterranean form (Cylicob- 
della lumbricoides), also without eyes or jaws. Cyclob- 
della glabra® is said to have ten eyes, but no jaws; and 
Hylobdella, Doringii, and H. flavolineata are reported 
1 Halle’sche, ‘ Zeitschr. f. d. gesammten Naturwissenschaften,’ vi, pp. 435— 
442,1872. Of. ‘ Leuckart’s Bericht,’ 1872—1875. 
2 « Arch. f. Naturgesch.,’ pp. 87—121, 1871. ‘ Leuckart’s Bericht,’ 1870— 
1871. 
3 *Boletin de la academianacional de ciencias de la repub. Argentina,’ ii, 
pp. 231—244, According to ‘ Leuckart’s Bericht.’ ° 
