374 C. O. WHITMAN. 
erable number of wart-like protuberances. The denticles are 
straight, conical, and radially directed; the longest (‘035 mm.) 
are placed at the inner angle of the maxilla, from which point 
they diminish gradually in length towards the external angle, 
where they vanish in the merest rudiments. 
In a specimen measuring 85 mm. in length, the cesophagus 
measured 6 mm. (excluding the maxille) ; the anterior half 
shows only three folds, one median dorsal and two latero- 
ventral. Hach of these folds divides into two near the middle 
of the cesophagus, thus making six folds in the posterior half. 
The segmental papille are remarkably large, resembling in 
form, size, and inclination those seen in the Medicinal Leeches 
of Saigon, Singapore, and Ceylon. In number and position 
they agree with those of Hirudo. In no other species have I 
seen such an extraordinary number of these papille on the 
acetabulum. Their arrangement here shows that the aceta- 
bulum is composed of at least eight somites, each of which is 
now represented by a single papillate ring. The abbreviation 
is thus carried further here than in any other portion of the 
Leech except in the cephalic lobe. 
The median papille (m.) incline a little towards the median 
line of the dorsal surface ; the inner lateral papille incline still 
more in this direction; and the outer lateral (ol.) and the 
marginal papille (mg.) have their longer axis directed nearly 
at right angles to the axis of the body. 
I am wholly indebted to Dr. Sluiter for the following 
description of the colour and markings of this species, which 
was very imperfectly described by Wahlberg :! 
“ Ground-colour of the dorsal side dull olive green, some- 
times inclining more to grass green, at other times more to 
brownish shades. In the median line of this side there is a 
series of elongated black spots, from twenty to twenty-five in 
number, which never blend into a continuous stripe. Towards 
the head these spots are smaller and often more rounded, 
while in the middle and posterior region they are more elon- 
1 Ofvers, ‘ Kong]. Vet.-Akad. Forh.,’ Stockholm, 1855, p. 233. Compare 
Diesing’s ‘ Revision der Myzhelminthen,’ Abth. Bdellideen, p. 38, Wien, 1859. 
