“Monoculodes antarcticus, n.sp.
? Strauss, 1909, p. 68, figs. 41-43. (Bathymedon acutifrons, non Bonnier.)
Occurrence: 1. St. 167. South Orkneys. 8 SS 6—zo mm., II yy 15-21 mm., 3 immat. 12 mm. Types.
2. St. 175. South Shetlands. 1 ♀17 mm.
3. St. 181. Palmer Archipelago. 9 ♀♀ (2 ovig.) 13-16 mm.
4. St. 182. Palmer Archipelago. 1 ♂ 15 mm., 2 ♀♀17-18 mm.
5. St. 187. Palmer Archipelago. 1 ♂ 14 mm., 1 ♀15 mm.
Description. Integument smooth, except when seen under a high magnification, when it has the appearance shown in the figure, viz. extremely minute denticles either singly or in groups. Back rounded, though peraeon segment 7 and the pleon are somewhat imbricate in profile. Rostrum moderate, reaching not quite to end of 1st joint of antenna 1, deflexed, evenly curved. Head not narrowly produced behind eyes. Eyes invisible, probably represented by a patch of white pigment on base of rostrum. Side-plates 1-4 rather deep, 1 subtriangular, expanded in front, as long as deep, 4 also as long as deep, posterior margin shallowly emarginate, postero-inferior margin oblique, straight. Postero-inferior angle of pleon segment 3 broadly rounded. Telson ovoid, longer than broad, distal margin slightly convex, with two spinules set in notches.
Antenna 1 reaching a short distance beyond peduncle of antenna 2, 1st and 2nd joints subequal, 3rd shorter, flagellum a little longer than peduncle, 20-jointed. Antenna 2, 4th joint slightly longer than 5th.
Gnathopod 1, 5th joint oblique, distally produced forwards, 6th oblong, longer than 5th, palm a little longer than hind margin, and defined by a long spine, with a small tooth below the spine. Gnathopod 2, the narrow process of 5th joint extending only half-way along lower margin of 6th joint, which is narrow oblong, palm defined by a long spine.
Peraeopods 1 and 2 stout, 4th-7th joints rather strongly expanded, 5th and 6th joints subequal, 7th a trifle longer than 6th, cultrate. Peraeopods 3 and 4, 2nd joint narrow pyriform, posterior margin distally straight or slightly concave, 4th expanded, much wider than 3rd or 5th, 6th longer than 5th, 7th longer than 6th, almost as long as 4th. Peraeopod 5, 2nd joint broadly pyriform, 4th not expanded, 4th and 5th subequal, 6th a little longer.
Remarks. Unlike the northern representatives of this genus, this species apparently has degenerate or very inconspicuous eyes, though the eyes in pallidus, Sars, are feebly developed, and in tenuirostris they are described as faint in alcoholic specimens. As further specific characters of this species may be noted the short process of 5th joint of gnathopod 2, and the strongly expanded joints of peraeopods 1 and 2.
It is more likely that the specimens recorded by Strauss (1909) as Bathymedon acutifrons are really this species than that they are referable to Bonnier's species.”
(Barnard, 1932: 136-138)
