480 
AETICULATA. 
[Chap. Xin. 
which are too hot and dry for them ; but amongst the 
rank vegetation in the lower ranges of the hill country, 
may be a H. Boscii, distinct and the aperture is shaped as in 
from the H. Ceylanica. That ordinary leeches. The serratures 
which is foroid in Ceylon is round, of the teeth, or rather the teeth 
a little flattened on the inferior rently (I have not yet made this 
surface, largest at the anal ex- out quite satisfactorily) set upon 
tremity, thence gradually tapering one side. I have not yet "been 
forward, and with the anal sucker able to detect the anal or sexual 
composed of four rings, and wider pores. The anal sucker seems to 
in proportion than in other species, be formed of four rings, and on 
It is of a clear brown colour, with each side above is a sort of crenated 
a yellow stripe the entire length flesh-like appendage. The tint of 
of each side, and a greenish dorsal the common species is yellowish- 
one. The body is formed of 100 brown or snuff-coloured, streaked 
rings ; the eyes, of which there with black, with a yellow-greenish 
are five pairs, are placed in an arch dorsal, and another lateral line 
on the dorsal surface; the first four along its whole length. There is 
pairs occupying contiguous rings a larger species to be found in this 
(thus differing from the water- garden with a broad green dorsal 
leeches, which have an unoccupied fascia ; but I have not been able 
ring betwixt the third and fourth) ; to procure one although I have 
the fifth pair are located on the offered a small reward to any 
seventh ring, two vacant rings in- coolie who will bring me one." In 
tervening. To Mr. Thwaites, Di- a subsequent communication Mr. 
rector of the Botanic Garden at Thwaites remarks " that the dorsal 
Peradenia, who at my request ex- longitudinal fascia is of the same 
amined their structure minutely, I width as the lateral ones, and 
am indebted for the following most differs only in being perhaps 
interesting particulars respecting slightly more green ; the colour of 
them. ^ "I have been giving a the three fascise varies from 
little time to the examination of brownish-yellow to bright green." 
the land leech. I_ find it to have He likewise states " that the 
five pairs of ocelli, the first four rings which compose the body are 
seated on corresponding segments, just 100, and the teeth 70 to 80 
and the posterior pair on the in each set, in a single row, except 
seventh segment or ring, the fifth to one end, where they are in a 
and sixth rings being eyeless (fig. double row." 
A.). The mouth is very retractile, 
EYES AKD TEETH OF THE LASD 
LEECH OF CEYEOiST. 
themselves, are very beautiful. 
Each of the three ' teeth,' or cut- 
ting instruments, is principally 
muscular, the muscular body being 
very clearly seen. The rounded 
edge in which the teeth are set ap- 
pears to be cartilaginous in struc- 
ture ; the teeth are very numerous, 
(fig. B); but some near the base 
have a curious appendage, appa- 
