| OCR Text |
Show 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. HIRUDO BELCHERI, 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 numerous pointed raised dots or small tubercles, about 40 on each ring. Oral sucker of considerable size ; ventral moderate, and radiately 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 E. Belcher, R.N.). 4. HIRUDO MACULATA, Baird. Body depressed, flat beneath, slightly convex on the back; attenuated 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 7\ lines. Hab. Siam. 5. HIRUDO ASSIMILIS, Baird. Body rather narrow, attenuated anteriorly, of a light yellowish colour above and beneath. Back convex, marked with an indistinct 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 //. 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 from India, the present, and succeeding species, all from the East. |
