480 
ARTICULATA. 
(Crar. NII. 
which are too hot and dry for them; but amongst the 
rank vegetation in the lower ranges of the hill country. 
may be a A. Boseii, distinct 
from the HL Ceclanioa, That 
which ts found in Ceylon is round, 
ae 
BYES AND TEE (CH OF THE LAND 
LEECH OF CEYLON, 
a little flattened on the inferior 
surtice, largest at the anal ex- 
tremity, thence gradually tapering 
forward, and with the anal sucker 
composed of four rings, and wider 
in propertion than in other species. 
It is of a clear brown colour, with 
a yellow stripe the entire length 
of each side, and a greenish dorsal 
one, The body is formed of 100 
rings; the eyes, of which there 
are five pairs, are placed in an arch 
on the dorsal surface; the tirst four 
pairs occupying contiguous rags 
(thus difteving from the water. 
leeches, whieh have an wneceupied 
ring betwixt the thindand fourth); 
the fitth pair are located on the 
seventh ring, two vacant rings in- 
tervening. To Mr. Thwaites, Di- 
rector of the Botanie Garden at 
Peradenia, who at my request ox- 
amined their structure minutely, I 
am indebted for the following mest 
interesting particulars respecting 
them, , “I have been giving a 
little time to the examination of 
the land leech. I find it to have 
five pairs of ocvelli, the first four 
seated on corresponding segments, 
and the posterior pair on the 
seventh segment or ring, the fifth 
and sixth rings being eyeless (fig. 
A) The mouth is very retractile. 
and the aperture is shaped as in 
ontinary leeches, The scrratures 
of the teeth, or rather the teeth 
themselves, are very — beautiful. 
Each of the three ‘teeth. or cut- 
ting Instruments, is prineipally 
rutseular, the muscular body being 
very elearly seen. The rounded 
edge in which the teeth are set ap- 
pears to be eartilagincus in struc 
ture: the teeth are very numerous, 
(ig. B): but some near the base 
have a curious appendage, apps- 
reutly (T have not vet made this 
out quite satistnetorily) set upon 
eue side T have not yet been 
able to detect the anal or sexual 
pores, The anal sucker seems to 
be formed of four tings, and on 
each side abore isa sort af erenated 
flesh-like appendage, The tint of 
the commen species is yellowish- 
brown or snuffecloured, streaked 
with black, with a yellow-grvenish 
dorsal, and another lateral line 
along its whole length. There is 
a larger species to be found in this 
garden with a broad green dorsal 
fascia: but I have not been able 
to procure one although I have 
ottered al small) reward te any 
coalie who will bring me enue.” Ta 
a subsequent communication Mr. 
Thwaites remarks © that the dorsal 
longitudinal fascia is of the sume 
width as the lateral ones, and 
differs only in being perhaps 
slightly more green: the colour of 
the three fascixe varies from 
brownish-yellow to bright green.” 
He likewise states “that the 
rings which compese the bedy are 
jest 100, and the teeth TO te 80 
in each set, ina single row, except 
to one end. where they are in a 
double row.” 
