Report on the zoological collections made in the Indo-Pacific Ocean ...

CRTTSTACEA. 317this genus or to Megamoera, from Port Jackson, 5-7 fms. (No. 104),but which, having lost both pairs of antennae and the terminal segment,cannot be referred to any genus with cei'tainty. It is distinguishedfrom the various species described by Mr. Haswell by thegreat length of the first legs, which exceed the legs of the secondpair in length, and have the merus considerably produced at thepostero-distal angle, the carpus about twice as long as the propusand truncated at its distal end, propus posteriorly arcuated, dactylabout half as long as the propus : the legs of the second pair have themerus short, carpus more than half as long as the palm and truncatedat its distal extremity ;palm or propus considerably enlarged,its distal margin oblique and nearly straight, defined at the posterodistalangle by a small spine, and with a truncated lobe or toothnearer the base of the dactylus, which is strongly arcuated anddoes not reach quite to the postero-distal angle of the palm. Thecoxae of the four anterior legs are deeper than the segments withwhich they are articulated. The three posterior legs slender, withthe basus-joints little dilated and posteriorly entire, the merusjointsnot distally produced into lobes or teeth. The uropoda arebiramose, the rami subequal, those of the posterior pair very small,not foliaceous. The segments of the body are without teeth, spines,or spinules. The coloration (in spirit) whitish, the body coveredwith numerous small black dots.In the form of the anterior legs and in the coloration it resemblesAmphithoe setosa, Haswell, from Botany Bay, but diff'ers in the formof the palm of the second leg, and, I suppose, of the posterioruropoda.7. Megamcera suensis, Haswell ?As Mr. Haswell's description is very short and our specimens differslightly from his figure in the form of the second legs, I append thefollowing description:—Body rather robust; head with a smalllateral tooth behind the antero-lateral angles. Coxne of the firstfour thoracic limbs deeper than their respective body-segments, thefirst pair not much prolonged at the antero-lateral angles, which arerounded or subacute. The last thoracic segment and the first andsecond postabdominal segments have their posterior margins armedwith two small dorsal spines ; the thii'd is dorsally eraarginate butwithout spines ; the fourth has its posterior and dorsal marginsarmed with two strong triangulate acute lobes or teeth. The firstand second postabdominal segments have a small spinule at theirpostero-lateral angles ; the third segment has its postero-lateralangles truncated and armed witli three to five teeth ; the lobes ofthe terminal segment, which are subcylindrical, are tipped with afew setae. The eyes are oval, black. The antennae are somewhathairy ; the superior antennae are broken, but exceed the head andthoracic segments in length ; the basal peduncular joints are thickerand somewhat shorter than the second joints ; the third joints veryshort ; the slender accessory flagellum is composed of three rather