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Show 1886.] DURING THE VOYAGE OF H.M.S. 'CHALLENGER.' 103 single elongated claw ; the antennule has a four-jointed peduncle and a long multiarticulate flagellum ; the uropoda are defective but evidently are of considerable size, judging from the socket of articulation. The whole body is covered with short slender spines of varying size, but nowhere very long. 1. ACANTHOMUNNA PROTEUS, 11. Sp. This species, the only one referable to the genus, is represented by two individuals, both males, dredged off N ew Zealand in 700 and 1000 fathoms respectively. The larger specimen measures 7 millim. in length. The general shape of the body is as in Munna, but differs iu being covered with innumerable spines, many of which are branched ; the spines are nowhere of very great length. The head is furnished with a pair of eyes situated laterally ; these are elevated upon short stalks; the abdominal shield is preceded by a short free abdominal segment; it is extremely convex anteriorly, and the point of articulation of the uropoda is upon the dorsal surface, though near to the lateral margin ; behind the articulation of their appendages, the abdominal shield is flattened and terminates in a truncated, slightly concave extremity. The antennules have a four-jointed peduncle, the third joint being the longest, and a multiarticulate flagellum longer than the peduncle. The mandibles have a palp. The first pair of thoracic appendages are shorter than the rest and subcheliform ; the remaining thoracic appendages are very long, owing to the elongation of the fourth and fifth joints ; they terminate in a single claw ; these appendages are covered with slender unbranched spines, which arise from tubercles. The uropoda are defective, but appear to have been larger than those of Munna, &c, and possibly more fully developed. Station 168; 1100 fathoms. Station 169 ; 700 fathoms. Fam. ASELLID^E. Genus STENETRIUM, Haswell. 1. STENETRIUM HASWELLT, n. sp. A single species of this genus, the only known deep-water species, was dredged off the coast of S. America in 600 fathoms. The specimen is a male, and measures 16 millim. in length. The diameter of the body is everywhere much the same except the head and the terminal region of the abdominal shield. The head is prolonged into a short rostrum; eyes are presentof narrow linear shape, and set obliquely. The thoracic segments are subequal in length as well as breadth, and the dorsal surface is quite smooth ; the margins of the first thoracic segment are prolonged into a triangular spiny process ; in the second segment the margin is furnished with a smaller spine-like process ; in the two following segments there is in addition a smaller posterior spine ; in the fifth segment the antero-lateral spine is much wider, occupying nearly the whole of the lateral margin ; in the two remaining segments, the lateral |
