1869.) DR. W. BAIRD ON NEW ANNELIDES. 317 
HetTreROBDELLA 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. Anus 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. GLosstIPHONIA RUDIS, Baird. 
Body of an obovate form, and of a uniform olive-colour ; roughly 
annulated, each ring armed with a series of tubercles along its sur- 
face, and having a number of larger, reddish-coloured tubercles scat- 
tered 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 3 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 
strie. Ventral sucker rather small, round. Back somewhat con- 
vex, ventral surface concave. 
Length about 10 lines, greatest breadth 4 lines. 
Hab. 2? Qld 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. yes six ; anterior pair very small, second pair 
large, and third pair smaller than second. Body of a hard crusta- 
