492 PROFESSOR CHARLES CHILTON ON THE 
mens, nor of the sexual differences, but states generally that the length of the 
flagellum of the antennee and of the cleft in the telson varies with age. 
It will be seen that, as SteBBrne points out, this Antarctic species is very close to 
E. propinquus of northern seas, and probably WaLKER is correct in definitely 
identifying it with that species; the resemblance, however, to other northern species, 
e.g. LH. longipes, is also very close, and I think it will be better in the meantime to 
leave the southern form under a distinctive name. The differences between all the 
described species of the genus are very slight, and probably further research will lead 
to a reduction of the number. 
EE. levis Walker was described from a single specimen, the size of which is not 
given ; from the shortness of the flagella of the antennze and of the projections of the 
carpus, and from the absence of dorsal teeth, it seems likely that it was an immature 
specimen, perhaps belonging to this species. 
With regard to H. microps Walker I do not feel able to express any definite 
opinion ; some of the specimens were of large size, and the long antenne would indicate 
that they were females, but, on the other hand, the telson is only very slightly cleft. 
M. Cuevrevx has recently (19118, p. 405, fig. 3), described another species, . 
bouviert, from the South Sandwich Islands, but in view of the variations in this species 
described above, it seems doubtful if the differences noted in the dorsal margin of the 
first segment of the urus, and in the smaller depth of the cleft of the telson, are of 
very much importance. His single specimen was an ovigerous female, but has the 
short antennee which appear to be the mark of the male as pointed out by CHEVREUX 
himself in H. latucarpus. 
Eusirus splendidus, sp. nov. (PI. I. fig. 20.) * 
South Orkneys, Scotia Bay, Station 325. 15th August 1903. 54 fathoms. Two 
specimens, both males: No. 1, 30 mm., No. 2, 35 mm. in length of body. 
First four segments of pereeon slightly compressed ; hinder portion of body much 
compressed, carinate, with pronounced dorsal teeth projecting backwards on the three 
last segments of pereeon and on the three segments of pleon ; first segment of urus with 
dorsal depression followed by slight carina on the posterior portion; second and third 
rounded. Side plates 1-4 slightly deeper than their respective segments; first pro- 
duced anteriorly into a rounded lobe reaching nearly to anterior margin of head, its 
posterior angle with two or three teeth; second and third rounded below, with two or 
three small teeth at the posterior angle; fourth broader, its posterior margin produced 
into a subacute lobe below the fifth, lower margin rounded, posterior margin below 
production serrate ; fifth with the posterior lobe deeper than the anterior; sixth with 
the posterior lobe produced downwards, much deeper and broader than the anterior ; 
seventh, small, rounded below, not divided into lobes. Epimeral plate of the first pleon 
segment narrowly rounded below ; second, much broader, rounded anteriorly, posterior 
* Probably the same as Husirus perdentatus Chevreux (bull. Muséum Hist. Nat., 1912, No. 4, p. 10). 
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