378 G. J. HINDE ON ANNELID JAWS FROM 
ARABELLITES CUSPIDATUS, Hinde. (Pl. XVIII. fig. 19.) 
Jaw oblong, truncate, flattened, with an elongated depression in 
the upper posterior portion, the lower and upper borders nearly 
straight and parallel; in front a stout blunted tooth or hook, which 
is nearly at right angles with the main portion of the jaw, and on 
the upper edge about eighteen rounded minute teeth. Length 24 
lines, width 2 line. 
ARABELLITES OVALIS, Hinde. (Pl. XVIII. fig. 16.) 
Main portion of jaw of an oval figure, with a very large, curved, 
and slightly twisted hook in front, and eight or nine small pointed 
teeth. Total length 13 line, width 2 line. 
ARABELLITES GiBBosus, Hinde. (Pl. XVIII. fig. 21.) 
Jaw oval and strongly convex, with a well-marked curved line 
extending from the base of the hook to the extremity ; in front is a 
short, slightly curved, very stout hook; on the main portion of the 
jaw are ten subequal, oblique, pointed teeth. Length 13 line, width 
4 line 
= : 
ARABELLITES ASCIALIS, Hinde. (PI. XVIII. fig. 17.) 
Jaw narrow, elongated, and tapering to a point; a very long, 
curved, anterior tooth, not in the same plane with the body of the 
jaw ; on the straight upper edge there are about seven minute acutely 
pointed teeth. Length 1 line, width + line. 
ARABELLITES RECTUS, Hinde. (Pl. XVIII. fig. 18.) 
Main portion of jaw somewhat triangular, widest in front, and 
gradually tapering to the blunted extremity; in front a very large 
and robust hook, with a deep longitudinal furrow near the outer 
side. Six teeth are visible on the upper edge of the jaw. Length 
33 lines, width # line. 
ARABELLITES LUNATUS, Hinde. (Pl. XIX. figs. 4, 5, 6.) 
Jaw sickle- or crescent-shaped, one end pointed, the other ex- 
tended into a rod-like prolongation, the front surface concave. On 
the curved outer rim of the crescent are from ten to twelve short 
rounded teeth, the two anterior ones are generally slightly larger 
and somewhat divergent from the others; in one instance, however, 
these anterior teeth are not present. In fig. 4 the length of the 
toothed portion is 1 line, and of the projection ? line; fig. 5 is 
14 line in length; and fig. 6 is Z line. 
This is a very abundant form, and shows a good deal of variation 
in different examples. 
ARABELLITES CRISTATUS, Hinde. (Pl. XIX. fig. 7.) 
Jaw crescentiform, with but a short angular projection, the front 
edge curved upwards, surface concave; on the upper border are 
eleven distinct elevated teeth, the first two of which are smaller 
and not in plane with the others. Length # line. 
