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

;316 COLLECTIONS FROM MELANESIA.segments and fourth and fifth segments exist only on the dorsalsurface, but on the third extend down to the rounded postero-lateralangles ; in the second segment the posterior margin above therounded postero-lateral angles is obscurely dentated. The lobes ofthe terminal segment arc subconical and tipped with one or twosetse. The eyes are oval, but very obscurely seen. The penultimatejoint of the peduncles of the superior antcnnaj is slightly longerand slenderer than the preceding ; the third joint, with which theshort accessory flagellum is articulated, is verj- short ; the flagellaare themselves imperfect ; the accessory flagella about 6-jointed.Tbe inferior antennae are much shorter than the superior ; the firstpeduncular joint little more than half as long as the second, whichis about as long as the third; the flagella 12-14-jointed. The firstlegs are slender and feeble ; the merus-joints very small, with posterioracute lobe and tooth ; the carpus resembles the propus orpalm, having the posterior margin convex, rounded, and hairy; thedactyl is a little more than half as long as the palm. The secondlegs have the carpus very short, propus considerably enlarged, longerthan broad, its distal margin oblique, slightly arcuated, and definedby a small tooth ; dactyl slightly arcuated, and closing against thedistal margin of the propus. The three posterior legs are slenderthe margins of the fourth to sixth joints with a few stiff hairs.The uropoda are biramose, the rami in the penultimate and antepenultimatepairs subequal ; the last pair are wanting in the threespecimens I have examined.Another specimen from Port Jackson, 0-5 fms., which I referdoubtfully to this genus (it having lost the head), and which I cannotidentify with any known Si^iecies, has the body smooth and unarmed,the first three postabdominal segments with a small spinuleat their postero-lateral angles ; the terminal segment has the lobesflattened and subacute distally. The first legs are small, with thecarpus and propus posteriorly arcuated, the carpus little shorterthan the propus. The second legs have the merus-joint short, butlittle produced at its postero-distal angle ; carpus transverse, dilatedin its distal half, which equals the width of the palm at base ;palmlonger than broad, narrower distally, with the distal margin veryoblique, not acute, but presenting a broad surface, against whichthe strong arcuate dactyl closes, and armed with four spines or lobesas follows—one defining the postero-distal angle, a pair of smallspines in front of this, and a rounded lobe below the articulation ofthe palm with the dactyl. The three posterior legs are ratherrobust, with the basus-joints not serrated ; the merus produced at itsanterior and distal angle. The outer ramus of the penultimate andantepenultimate uropoda is slightly shorter than the inner ramusthe rami of the last pair subequal, broader and slightly shorter thanthe preceding.This species, which may be designated provisionally M. crassimana,is apparently well distinguished by the form and dentition of thepalms of the second pair of legs.There is also in the collection a specimen which may belong to