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

;568 COLLECTIONS FROTM THE AVESTEEN INDIAN OCEAN.to third segments of the postabdomeii have their posterior marginsdorsally armed with a scries of minute sjjinules ; the first segmenthas a few spimiles on the postero-lateral margin above the posterolateralangle ; in the second segment the sijinnles are more numerous,and on the third they extend along nearly the whole length of thepostero-lateral margins and along part of the infero-lateral marginsand (in one specimen) are of very unequal length ; the fourth segmentis dorsally armed on its posterior margin with about fivealternately larger and smaller spinules ; there are a few minutespinules on the posterior margin of the fifth segment, and one at thepostero-lateral angles of the sixth segment. The telson is double,each of the lobes terminating in a spinule, above which are severalstiff' setae. The eyes are large, round, and black. The superiorantennae exceed the inferior in length ; the antepenultimate peduncularjoint is rather shorter and stouter than the next joint; thelast peduncular joint not longer and scarcely stouter than the firstjoint of the flagellum ; accessory flagellum about 5-jointed, flagellaimperfect. Tlie antepenultimate joint of the inferior antennae isabout half the length of the next joint ; second and third joints subequal; flagellum scarcely longer than the third joint. The first pairof legs (gnathopods) are comparatively slender and feeble ; wristand palm of about equal length and thickness, and palm with avery small and obscure notch in the middle of its distal margindactyl about half as long as palm. Second legs with the hands unequal; in the smaller (right) leg the wrist is dilated distally whereit is applied to the base of the palm, which is oblong-oval in form,with its very oblique distal margin obscurely crenulated and definedby an obscure lobe or tooth ; dactyl not half as long as palm. Thelarger (left) leg has the wrist posteriorly deeply excavated anddistally enlarged to the width of the palm, which is large, massive,nearly oblong in shape, with its distal margin deeply excavated, thenotch enclosing a small tooth and followed by a broad truncated anddenticulated lobe and by a spine defining the postero-distal anglethe dactyl is about as long as the distal margin of the palm, andhas a blunt subbasal lobe or tooth on its inner margin. The threeposterior pairs of legs have the second or basus-joints oblong-ovalin shape, and i)osteriorly produced at tho distal extremity into aprominent tooth or lobe, which in tho posterior pair is spiniform.The rami of tho first three pairs of postabdominal appendages areconsiderably elongated ; the fourth and fifth pairs are biramose, withthe rami subequal, styliform, and (like the bases) armed with stiffsetaj ; in the last pair the rami are subequal and foliaceous, with themargins serrated. Colour (in spirit) reddish. Length of the bodynearly 4 lines (8 millim.),Seychelles, 4-12 fms. ; two specimens.Both are somewhat mutilated ; the description was therefore takenpartly from one, partly from the other specimen.This species, in the form and dcnticulation of the hand of thelarger leg of the second pair^ somewhat resembles the Mediterranean