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Show 1886.] DURING THE VOYAGE OF H.M.S. 'CHALLENGER.' 117 with fine hairs. The uropoda are uniramous and consist of twelve joints. Off Prince Edward's Island ; 50-150 fathoms. Genus TYPHLOTANAIS, G. O. Sars. 1. TYPHLOTANAIS KERGUELENENSIS, n. sp. The individuals of this species measure up to 3 millim. in length. The cephalothorax is short and wide ; it is prolonged between the antennae into a short pointed triangular process ; eyes completely aborted. The first segment of the thorax is shorter than the rest which are subequal, diminishing slightly towards the posterior extremity of the body ; the first segment has a compressed forwardly-directed spine arising from the median ventral surface ; there is a trace of a similar process on the second segment. The first pair of thoracic appendages arise close to the anterior border of their segment, the second pair further back, the third pair from about the middle of the segment; the three posterior pairs of thoracic appendages arise close to the posterior boundary of their segments. The antennules are about as long as the cephalothorax. The chelipeds are rather slender. The uropoda are biramose, the outer ramus one-jointed, the inner two-jointed. Kerguelen, Christmas Harbour ; 120 fathoms. 2. TYPHLOTANAIS BRACHYURUS, n. sp. The length of this species is 8 millim. The cephalothorax is hardly longer than the first free thoracic segment; the first thoracic segment is one third less than either of the two following, which are sub-equal; the fourth segment is hardly shorter than the third, the fifth and sixth decrease progressively. The first pair of appendages is attached close to the anterior border of the segment; the two following pairs are moved a little way back, but are still quite close to the anterior extremity of their segments; the three posterior pairs are attached close to the posterior border of their segments. There is no ventral spine on the first free segment. The abdomen is short, and not so long as the last two segments of the thorax. The antennules are rather shorter than the cephalothorax. The chelipeds are short and stout. As in the last species, the three following pairs 'of appendages are more slender than the three posterior pairs. The uropoda are as in the last species. Station 246 ; 2050 fathoms. NEOTANAIS, nov. gen. This genus comes nearest to Heterotanais, but differs in the great length of the endopodite of the uropoda, and in the fact that the chelse are fully developed and of the normal structure in the male ; a well-marked character of this genus is the specialization of the thoracic appendages into an anterior and posterior series; in the first three pairs the distal joint of the limb is a single, somewhat curved |
