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Show 750 MR. W. F. LANCHESTER ON CRUSTACEANS [June 19, the basal joint of the antenna, but leaving the orbit widely open at this point. The postfrontal ridge is sinuous and not straight: and the extraorbital tooth is lobular and not pointed, though its anterior angle is rather sharp. In this latter respect it agrees with a description by von Martens of seven Borneo examples (torn. cit.). As it has the same shape in all these individuals irrespective of size or sex, I do not think it is a peculiarity of age, as he at first suggests, but rather one of local race : the possibility of which von Martens admits a few-lines further on. In none of these specimens can I find any traces of the longitudinal groove of the median crest of the palate. As with Heller's examples of the species (t. c ) , the meri of all five legs bear a sub-terminal spine on their anterior margins : in all other respects they agree with M.-Edwards's description. In colour they are uniformly dark brow n above, with a tendency to yellow below. These crabs form burrows with two mouths, one of which would open on the bank of the lake, just above the level of the water, the other opening at a distance of at least 10 feet over a stream which carries off the surplus water of the lake : the burrow, between its mouths, being straight and horizontal, more or less. Tozzetti gives a figure of the internal angle of the orbit, but I cannot determine from it whether the upper tooth is well- or ill-developed, and he makes no mention of it in the text. H e also describes the sub-apical teeth of the meropodites as being much less acute than in the Thelphusse generally, and figures that on the 2nd pair, showing it to be more of a rounded lobe than a tcoth : in all five legs in this v ariety they are, on the contrary, very acute indeed. External maxillipedes. male abdomen, and bands of chelipedes, however, entirelv agree with his description and figures. Dim. d 52x38-5. d 42x33. d 37x25. 2 35 x 30-75. $ 19-75x16. Length taken from base of rostrum to middle of posterior border. XLIII. Genus CARCINOPLAX M.-Edw. 70. CARCTNOPLAX SUBINTEGER, nom. nov. (Plate XLVI. fig. 9.) Carcinoplax integra. Miers, 'Alert' Crust, p. 543, pi. xlviii. fie:. C (1884). Carcinoplax integer, de Man, Mergui Crust, p. 93 (1888). Hab. I a m uncertain as to whether this was obtained at Singapore or Malacca, or at what depth it occurs. 3 males, and 1 female with ova. I propose to alter Mr. Miers's specific name in view of the fact that the antero-lateral margins are not entire but dentated. This I find to be the case in all my specimens (3 d and 1 $ ), and also in two examples in the Museum from the Mergui collection. There are 4 teeth, small but distinct: tbe first two are low, broad, and truncate, the 2nd about as broad as the first: the 3rd, about |