MARINE CRUSTACEANS. 753 



This species is recorded by Milne-Edwards from Martinique, but I am unable to find any 

 difference between our Maldive specimen and his description. Milne-Edwards gives no figure, 

 but a comparison will be made more easy by that in the accompanying plate. 



Taken between tide-marks at Goidu, Goif'urfehendu Atoll. 



5. Cullianassa (Callichirus) novae -britanviae Borradaile, 1!)00. Willey's Zuol. Results 

 IV. p. 419. 



The specimen is small and the carapace very soft, so that the lines on it ar« not 

 easily seen. Fig. 12.5, on p. 691 above, is from the New Britain specimen, and shows well 

 the two longitudinal lines — linea thalassinica and linea anomurica — which, by a very rare 

 exception, are here found together. 



Taken between tide-marks at Goidu, Goifurfehendu Atoll. 



6. Calliancissa {Trypaea) maldivensis n. sp. (PI. LVIII, fig. 3.) 



Definition: "A Callianassa with the eyestalks short, flattened, pointed, with the cornea 

 on the outside ; the rostrum sharp, reaching to the end of the cornea ; no antennal tooth 

 on the carapace ; the segments of the abdomen about equal, but the first rather shorter, 

 and the second rather longer than the rest ; the third joint of the antennular stalk longer 

 than the others, as long as the flagella; the third maxillipeds with the ischiopodite and 

 meropodite broad, but the last three joints narrow ; the palm of the great chela as broad 

 as, and about twice as long as, the wrist, both wrist and palm sharp-edged above and below, 

 scantily hairy except on the fingers, the lower edge of the palm .saw-like within at the base, 

 that of the ischiopodite and meropodite with strong curved teeth ; the telson as long as 

 the sixth abdominal limb." 



Length of the single .specimen: 19 mm. Colour in spirit: white. 



Taken between tide-marks at Hulule, Male Atoll. 



Suborder Macbura. Tribe Scyllaridea. 



The members of this group are for the most part large and have heavy, well-armoured 

 bodies which are generally somewhat flattened, at least in the abdomen, and almost, or 

 quite, unprovided with a rostrum. They are distinguished from nearly all other Decapoda 

 by having none of their legs chelate, except sometimes the last pair, but they are not on this 

 account defenceless, for the abdominal segments usually carry at each side a sharp point, 

 and the abdomen thus becomes a powerful weapon which can be used with great effect. 

 They mostly live in water which is at least several fathoms deep, but the rock - lobsters 

 may be taken between tide-marks at night in the tropics, and small specimens are found 

 in the same place in daylight. Of the two families', the Scyllaridae or bear crabs are found 

 on sandy bottoms, where they probably use as shovels the broad, flat plates which represent 

 their antennae, but the Palinuridae, or rock-lobsters, like rocky ground, often living on the 

 outer slopes of coral reefs, but never in the lagoons. The antennae of this family have 

 very long, stout, stiff flagella, and generally a special roughened surface on the first free 



' Key to the families of the ScyUuriilea. II. Carapace flat. Eyes in complete orbits. Flagelluin of 



I. Carapace cyliudrieal. Eyes in incomplete orbits. An- antenna represented by a flat plate. Scyllaridae. 



tenuae with long, stiff flagella. Palinuridae. 



