324. Cc. O. WHITMAN. 
coalesce on the ventral side, and the sixth and seventh are less 
deeply separated on the ventral than on the dorsal side. The 
anterior portion of the body generally appears more deeply 
annulated in extension than at rest. 
Buccal Annuli—the fourth and fifth, which unite to form 
a single ring on the ventral side. They form the lateral and 
ventral boundary of the buccal aperture. 
Genital Apertures.—The male orifice lies between the 
29th and the 50th ring, or between the 25th and the 26th, if 
we begin with the buccal rings and count them asa single ring, 
as they appear when seen from the veutral side. 
The female orifice lies between the 34th and 35th, or 30th 
and 31st, counting on the ventral side. 
Clitellum embraces fifteen rings (three somites), beginning 
with the 25th and ending with the 39th. These rings have 
sometimes a dusky hue. 
Anus, behind the last annulus, between this and the 
posterior sucker. 
Ocelli, five pairs; the first four pairs arranged in a semi- 
circle on the first four rings, the fifth pair on the 7th 
ring. The absence of a ring between the rings bearing the 
third and fourth pairs of eyes is a character in which all the 
Land Leeches agree, and one which distinguishes them from 
Hirudo, Hzmopis, and Aulostoma, 
Cisophagus has three folds, one median dorsal, and two 
latero-ventral. 
Maxille three, corresponding in position with the three 
cesophageal folds; relatively larger, higher, and thinner than 
in Hirudo; armed with about ninety denticles, which increase 
in size in the direction of convergence of the jaws, and curve 
slightly in the opposite direction. It is thus the inner pos- 
terior end of the jaw, which here, as in the Medicinal Leeches, 
is furnished with the larger denticles. The scar has the form 
of three converging lines forming about equal angles with one 
another, precisely as in Hirudo. 
Nephridial pores open in the marginal line of the body 
instead of on the ventral side, as in Hirudo. There are seven- 
