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Show 200 DR. W. T. CALMAN ON THE MACRUROUS [Mar. 6, as the palm, a small tooth at base of immovable finger. Third peraeopods a little stouter than fourth (Plate XIII. fig. 50); merus in both with three spines below; propodus about three and a half times as long as dactylus, which is unarmed except for the terminal spine. Dactylus of fifth pair (Plate XIII. fig. 51) one-third of length of propodus, with a comb of about 37 slender spines besides the stout terminal spine. Telson (Plate XIII. fig. 52) equal to sixth abdominal somite. Outer plate of uropods slightly shorter than inner, with a transverse row of about fourteen spines. Total length 9 m m . Eggs -45 x '62 m m. Remarks.-This species is at once distinguished from all other Atyidae known to m e by the structure of the first pair of chelae. In the absence of spines other than the apical one on the dactyli of the third and fourth pairs of legs, it resembles the species described above as Limnocaridina parvula. Occurrence.-Kala, 19.xi.04. " Taken on rocks, shallow water." One specimen. Kirando, l.xii.04. " Taken in about 8 fathoms of water among shells." Six specimens. TJtinta, 6.xii.04. " Dredged in about 15 fathoms, among shells." Many specimens. CARIDELLA MINUTA, sp. n. (Plate XIII. figs. 53-56.) Description.-Rostrum (Plate XIII. fig. 53) hardly reaching beyond first segment of antennular peduncle, about one-quarter of length of carapace, straight, teeth -~ . Antennular peduncle not reaching to end of antennal scale, second and third segments broader than long, external spine of first segment not reaching end of segment, no distinct distal spine. Distal edge of antennal scale projecting beyond external tooth. Third maxilliped extending beyond antennular peduncle. First peraeopods (Plate XIII. fig. 54) very short and stout; carpus broader than long, strongly excavated distally ; chela nearly three times as long as carpus and a little broader, about twice as long as broad ; fingers two-thirds as long as the palm, slightly gaping; no tooth at base of immovable finger. Second peraeopods (Plate XIII. fig. 55) more slender ; carpus twice as long as broad ; chela one and a half times as long as carpus, fingers a little longer than palm. Last three pairs of peraeopods (Plate XIII. fig. 56) similar and rather stout; dactylus at least one-third of length of propodus, and little more than twice as long as broad, with eight strong spines of which the second, not the terminal one, is the largest. Telson equal to sixth abdominal somite. Outer plate of uropods slightly shorter than inner, with a transverse row of four spines. Total length 4 m m . Eggs *22 x 15 m m. Remarks.-Owing to the very small size of this species, it is extremely difficult to determine its exact branchial formula, but I have satisfied myself that it has no pleurobranch on the |