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Show 1869.] DR. W. BAIRD ON NEW ANNELIDES. 317 HETEROBDELLA MEXICANA, Baird. Body rounded dorsally, flattened ventrally; narrow, nearly uniform in breadth, but slightly attenuated anteriorly ; of a uniform pale brown colour. Rings very narrow, rather rugose. Oral sucker rather small; upper lip prominent, plaited. Ventral sucker round, deep, plaited on outer margin, smooth, obliquely terminal, and with a ventral aspect; in several specimens this sucker was closed, being contracted longitudinally. x\nus distinctly visible, of moderate size, between the fourth and fifth last ring, above the ventral sucker. Length about 20 lines, breadth about 4 lines. Hab. Mexico. Collected by M . Salle. Genus GLOSSIPHONIA, Johnson. 1. G L O S S I P H O N I A R U D I S , Baird. Body of an obovate form, and of a uniform olive-colour ; roughly annulated, each ring armed with a series of tubercles along its surface, and having a number of larger, reddish-coloured tubercles scattered irregularly over the surface of the back. Head and body continuous. Dorsum rather convex, ventrally concave. Oral sucker smaller than ventral, which is round, hollow, and smooth internally. Eyes? six in number (as far as could be made out). Sexual orifice about the twenty-third ring. Length about 1 inch, greatest breadth nearly \ inch. Hab. Great Bear Lake, N . America (Sir J. Richardson, M.D.). 2. GLOSSIPHONIA TRISULCATA, Baird. Body obovate ; head small, distinct from the body, being separated by a distinct notch. Eyes two, or, if four, placed so close together that they look as only two. Of a uniform dull olive-colour, with three distinct raised sulci or ridges, which converge to a point at the upper part of the body, just below the head, and nearly converging posteriorly also. The ridges are beset, all along their upper margins, with raised tubercles. Ventral surface as if trellised by crossing striae. Ventral sucker rather small, round. Back somewhat convex, ventral surface concave. Length about 10 lines, greatest breadth 4 lines. Hab. ? Old collection. 3. GLOSSIPHONIA CIMICIFORMIS, Baird. Body rounded oval, flat, somewhat concave ventrally, nearly flat on dorsal surface. Rings very close and indistinct, beset with six longitudinal rows of raised tubercles, the two central rows the largest and most distinct. Colour above of a reddish brown, the tubercles lighter in hue. Borders or margins of body very thick and large, leaving a hollow space in the centre of ventral surface, with a row of black spots on each side running longitudinally for the greatest part of its length. Eyes six ; anterior pair very small, second pair large, and third pair smaller than second. Body of a hard crusta- |
