and two posterior smaller teeth directed posterolaterally. The posterior margin of the carapace is rounded and carries two posteriorly directed paramedian spines submarginal in position.

Anterior to the orbits the carapace is deflexed, so that the tips of the rostra are ventral to the cornea. The carapace is convex antero-posteriorly and is armed in the midline with four tubercles—two mesogastric, which are spinate, a small urogastric, and one intestinal. In addition, there is a pair of cardiac tubercles, and a large branchial one which forms the apex of a triangle with smaller ones at the other angles. A slightly divergent row of hooked hairs extends from the rostrum on to the protogastric, each rising from a small spine, of which the second—the post-frontal—and the four and fifth—protogastric—are the largest.

The second antennal article is broad and forms the floor of the orbit. Its anterolateral angle projects at the side of the rostrum beyond the supraocular eave as a forwardly directed spine, followed on its outer margin by three or four small spinules. The spine bears a small accessory spinule on its medial border, and there is another spine close to the origin of the third antennal article. The second and third antennal articles are visible at the side of the rostrum. The flagellum outreaches the rostrum by about half its length.

The antennules are set almost longitudinally; the fossa is divided into two by a large interantennular spine, and by a median anterior spiniform process from the epistome. The epistome is well developed, and is divided into two parts by a shallow, transverse groove which connects the two prominences upon which the antennal glands open.

The third maxillipeds completely close the buccal cavern; the ischium and merus are finely dentate along their inner margins which are sparsely provided with hairs. The merus is expanded at its anteroexternal angle into a rounded lobe which bears four or five well-spaced denticles. There is a small spine at the anterointernal angle by the origin of the palp.

The subhepatic region is bluntly swollen, and carries three small tubercles, the posterior and outer one being the largest. The large branchiohepatic suleus is slightly hollowed out beneath, and a groove runs from this point anteriorly between the subhepatic and pterygostomial regions to the inferior orbital border between the postocular cup and the basal antennal article.

The abdomen consists of seven distinct segments; it is almost straight except for a slight widening of the sixth segment distally. It is ridged in the midline and provided with a series of long, straight hairs. The sternal segments are distinct, and slightly excavated on each side of the sutures.

The chelipeds are weak, being only slightly longer than the first ambulatory legs; they are equal in size. The palm is bluntly carinate above and below; the fingers are half the length of the palm, and meet only at their tips. The carpus is triangular and unarmed. The merus is also triangular in section with the apex of the triangle forming the sharp lateral margin, while of the other two margins which are medial, the dorsal carries two sharp spines, and the ventral a tubercle