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Show 120 MR. F. E. BEDDARD ON ISOPODA COLLECTED [Feb. 2, and measures 10 millim. The head terminates anteriorly in a yery long obtusely pointed rostrum. Eyes are completely absent. Ine first three segments of the thorax are, as usual, much shorter than the two following. The surface of the body is smooth, Ine first pair of thoracic appendages are operculiform and consist ot five joints, the second being much the most important; the two following pairs of appendages differ from the two last in being very much more slender, otherwise their structure is much the same. Station 76 ; 900 fathoms. 2. ANCEUS GIGAS, n. sp. This large species is represented by a number of individuals both male and female; the largest specimens measure as much as 16 millim., the females being hardly smaller than the males. In the male the anterior margin of the head is almost straight, being only broken by three minute processes, one of which is median. The thoracic segments are quite like those of other species; the lateral regions of these segments are roughened, the dorsal smoother. The abdominal segments are furnished with well-developed sickle-shaped epimera, which instead of projecting outwards from the body are bent down. The first thoracic appendages agree with those of the last species in having six joints ; the remaining thoracic appendages are all similar to each other. Kerguelen, Christmas Harbour, 120 fathoms. 3. ANCEUS TUBERCULOSUS, n. sp. A second species of Anceus was obtained at Kerguelen, which cannot be confounded with the preceding ; it is represented by a considerable number of specimens, both males and females. The largest male measures only 5 millim. in length. The head is prolonged in the middle line into a short rostrum, which is squarish in outline and has a semicircular notch at its extremity. The dorsal surface of the head is very convex, and is covered with numerous tubercles, which are especially abundant posteriorly and laterally. The three anterior segments (including the rudimentary first free segment) are similarly beset with tubercles; the remaining segments are smooth. The segments of the abdomen gradually increase in length, they are furnished with well-developed sickle-shaped epimera, which project outwards. The ambulatory limbs are all similar to each other; the five anterior abdominal appendages are flattened and smooth, without any hairs. Kerguelen, Christmas Harbour, 120 fathoms. Kerguelen, Royal Sound, 30 fathoms. 4. ANCEUS LATIDENS, n. sp. A single male specimen of this species measures 2*5 m m . The anterior margin of the head is prolonged into three short, blunt protuberances, of which the median one is the largest. The head and |