THE LEECHES OF JAPAN. 323 
but pointed in extension; acetabulum moderately large, 
round or oval, often obtusely acuminate in front, centrally 
attached, separated from the body only by a feeble constriction ; 
ocelli in five pairs, the rings bearing the third and the 
fourth pair not separated by an intervening ring as in Hirudo; 
the rings bearing the fourth and the fifth pairs separated by 
two rings; esophagus with three plications, one dorsal and 
two latero-ventral; maxille three, armed with numerous 
denticles that increase in size towards the converging anterior 
ends of the jaws, and curve slightly in the opposite direction ; 
clitellum includes fifteen rings (= three somites) ; genital 
orifices separated by five rings; nephridial pores situated 
in the margin of the body, instead of on the ventral surface, 
the last pair opening in the constriction that separates the 
acetabulum from the body, and marked by three minute over- 
arching lobes which are usually paler in color than the rest of 
the body ; segmental papillz above and below, strongly deve- 
loped on the dorsal side. 
Hamapipsa saponica,! nov. sp., Pl. XVII, figs. 1—7. 
Diagnostic Characters. 
Body, in extension, nearly cylindrical, tapering gradually 
towards the head (figs. 3, 5), about 5 mm. in diameter near 
the acetabulum, and 2 mm. just behind the cephalic lobe; at 
rest, more flattened, resembling Hirudo in shape (fig. 1). 
Length, at rest, 20 mm. ; in extension, 50 mm. 
Cephalic lobe, in extension, very pointed (figs. 3, 5) 
at rest, rounded (figs. 1, 2). 
Acetabulum 6—7 mm. in diameter; circular, or ovato- 
rotundate, with the narrower anterior end very obtusely acu- 
minate, as in figs. 5 and 9; centrally attached. 
Annuli 96.—The first three, bearing the first, second, and 
third pair of eyes, are obscurely marked ; the fourth and fifth 
1 This is not Hirudo japonica auctorum, a name which I have been 
compelled to ignore, since the meagreness of the description makes identifica. 
tion impossible. 
