Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 330 DISCOVERY REPORTS Antenna: basis with small inner and outer spines; scale broad, without outer basal seta. Mouth parts rudimentary. Endopods of maxillipedes 2 and 3 rudimentary, seated low down on basis. Exopods on maxillipedes 1-3 only. Chelaeoflegsiandalarge. Epipods absent. Four pairs of pleopods, that of somite 2 very small. Uropods absent. UPOGEBIIDAE The development of the European species Upogebia littoralis, U. stellata and U. deltaiira has been described by Sars, Cano and Webb, and these species, though
Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 330 DISCOVERY REPORTS Antenna: basis with small inner and outer spines; scale broad, without outer basal seta. Mouth parts rudimentary. Endopods of maxillipedes 2 and 3 rudimentary, seated low down on basis. Exopods on maxillipedes 1-3 only. Chelaeoflegsiandalarge. Epipods absent. Four pairs of pleopods, that of somite 2 very small. Uropods absent. UPOGEBIIDAE The development of the European species Upogebia littoralis, U. stellata and U. deltaiira has been described by Sars, Cano and Webb, and these species, though dis- tinguishable as larvae, differ only in very small details. The same is true also for larvae which I have attributed to U. danai} Larvae which are easily recognizable as belonging to the Upogebiidae are not uncommon in the Discovery and Barrier Reef plankton, and the uniformity of structure is very striking, having regard to the great range of difference found in Axiid-Callianassid group. There are, however, two forms of larva which require description, the one because it departs to some extent from the typical form and the other by reason of its abbreviated metamorphosis. For convenience of com- parison I include figures of the normal type of larva. Fig. 31. Thalassinid XI a. Telson. b. Maxillipede i. c. Maxillipedes 2 and 3. Upogebia sp. I (Fig. 32) Barrier Reef, St. 46. Stage III. Length 4-4 mm. General form as in U. deltaiira. Abdomen without spines; pleura rounded. Telson widening towards end, width about four-fifths of length; posterior margin slightly concave, with very small median spine and a spine formula of 8, i, 8; spine 2 reduced to a hair and spine 4 large, not jointed to telson. Antenna, basis with two small spines, exopod without outer seta near base, with large apical spine; endopod as long as exopod. Mandible without palp. Maxillule, palp of three segments, laciniae rather widely separated. Maxilla with four large inner lobes; endopod unsegme
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