Heterozius rotundifrons Milne-Edwards.

Heterozius rotundifrons Milne-Edwards, Ann. Soc. Entom. France, vol. 7, p. 275. 1867.

— Miers, Cat. Crust. N.Z., p. 15. 1876.

— Filhol, Mission de l'Ile Campbell, p. 372, Pl. 44, Figs. 6-7. 1885.

— Lenz, Zool. Jahrb., Bd. 14, p. 459. 1901.

Carapace flattened, scarcely grooved, smooth. Antero-lateral margins very long, so that a line joining their posterior angles would divide the carapace into two unequal parts, of which the anterior would be much the larger. They form a regular curve with the front, interrupted only by the orbits, anterior median fissure, and two small lateral fissures; the latter obscurely define two lobes. From the first fissure arises a shallow groove which limits the hepatic region behind, and ends in a deeper pit not far from the margin and parallel to it. A minute antero-lateral fissure sometimes occurs in front of the normal two. The cardiac region is marked laterally by a curved shallow groove, concave outwards. Front of carapace narrow, prominent, and, except for the faint median sulcus, rounded in the middle. Basal joint of the external antennae so small that the latter are scarcely separated from the fossettes of the inner antennae. Under surface; of the body and legs covered with very short hairs, especially in the female. Hands equal in the female, right hand enlarged in the male. Unenlarged hands rounded above, and smooth, except for a faint longitudinal groove along the upper outer surface, in a line with the movable finger; on the upper inner surface of the hand, near the wrist, is a small tubercle, variable in size; adjacent to it, the angle of the wrist sometimes makes a small tubercle. Fingers slender, as long as the palm, and nearly straight; each finger bears six to eight teeth, which are distant and separated by much finer denticulations; the fingers cross slightly at the tip. In the right hand of the male, the palm is much swollen, the tubercle is much more distinct, groove very faint; fingers thick, separated at the base, with the larger teeth prominent.