1869. } DR W. BAIRD ON NEW ANNELIDES. 315 
and as it were sunk beneath the others. Rings beset with spinulous 
tubercles, about 30 or 35 in number. In many the spines are only 
on the lower edge of the ring and point downwards. Oral sucker 
small; ventral deep and large, much plaited both internally and on 
the external margin, and covered externally with spinulous tubercles. 
Length nearly 3 inches, breadth (at broadest part) about 9 lines. 
Hab. Borneo. From the collection of Mr. Lowe, H.B.M. Consul 
at Sarawak. 
3. Hirupo BEeLcHeER!, Baird. 
Body depressed, slightly convex on the back, of a yellowish grey 
colour, indistintly banded near the dorsal margin with dark olive ; 
edges as it were serrated, attenuated anteriorly. Body consisting 
of about 95 very narrow rings, each ring beset all round with nu- 
merous pointed raised dots or small tubercles, about 40 on each 
ring. Oral sucker of considerable size ; ventral moderate, and ra- 
diately plaited internally and on external margin. The rings of this 
species are narrower and much more distinctly tubercular than 
those of Hirudo granulosa from India. 
Length of body 2} inches, breadth (at broadest part) 6 lines. 
Hab. Borneo (Sir EL. Belcher, R.N.). 
4, Hrrupo macutarta, Baird. 
Body depressed, flat beneath, slightly convex on the back; at- 
tenuated anteriorly. Back of a deep grey colour, marked in the 
centre with an interrupted black line, and a row of spots of the 
same colour near the edges, the spots being distributed alternately 
—first on one ring with an intermediate ring without a spot, then, 
secondly, a spot and two rings without a spot, and thus alternately 
throughout its whole length *. Abdominal surface lighter-coloured, 
with a broad line of a dark colour on each side. Rings very narrow, 
beset with numerous small tubercles, about 36 in number. Oral 
sucker of considerable size ; ventral circular, with a simple border, 
strongly plaited internally and granulous externally. 
Length of body about 2} inches; breadth (at broadest part) 
about 72 lines. 
Hab. Siam. 
5. Hirvupo assiMiLis, Baird. 
Body rather narrow, attenuated anteriorly, of a light yellowish 
colour above and beneath. Back convex, marked with an indistinet 
row of small spots in the centre, and an interrupted row of larger 
black spots at the margins, the spotted alternating with the unspotted 
rings, in the same way as in H. maculata, described above. Ventral 
surface of a uniform colour, without any markings. Rings larger 
* In general I have observed that in European species the marginal row of 
spots is continuous, a spot occurring on each ring, whilst in those from the 
Eastern countries the spots are alternate, as I have described them in the species 
mentioned here. ‘This holds good with the Hirudo granulosa trom India, the 
present, and succeeding species, all from the East. 
