490 PROFESSOR CHARLES CHILTON ON THE 
In the same year Detita VALLE included all the forms mentioned above under 
E. cuspidatus. 
In 1903 Waker described a new species, H. levis, from the Southern Cross 
Expedition, and said: “It may be easily distinguished from the other known species by 
the absence of dorsal teeth on the segments and by the entire margins of the third 
metasome segment and the first joints of the pereeopoda. From EF. cuspidatus, var. 
antarctica, Thomson, it is separated by the conspicuous dactylus of the maxillipeds.” 
In 1906 SrEessine combined the Challenger specimens with those described by 
THomson, and gave them under the name /. antarctica, thus raising THomson’s variety 
to the rank of a species. In describing it he says it is ““ exceedingly like L. propinquus” 
—another northern species. 
In 1907, from the National Antarctic Expedition, WALKER examined many specimens 
of Husirus, some of them of large size. These he referred to EL. propinquus G. O. 
Sars, giving a few points in which they differ, but stating that these are due to age. 
At the same time he described another new species, . microps, “recognisable by the 
relatively small eyes and slender hirsute legs. From its nearest ally, #. holma 
H. J. Hansen, it differs in the structure of the gnathopoda.” He makes no further 
comparison of these specimens with either L. antarctica or E. levis. 
In the same year CHEvREUX described two specimens obtained by the French 
Antarctic Expedition as the male and female of a new species, H. laticarpus. 
It will thus be seen that the question is already pretty complicated, and that the 
path of anyone endeavouring to identify species of Husvrus from Antarctic seas is by 
no means free from difficulty. 
Eusirus antarcticus G. M. Thomson. 
Eusirus cuspidatus, var, antarctica, G. M. Thomson, 1880, p. 4, and 1881, p. 26. 
longipes Stebbing, 1888, p. 965, pl. Ixxxvil. 
antarcticus Stebbing, 1906, p. 340. 
propinquus Walker, 1907, p. 30. 
»  laticarpus Chevreux, 1906, p. 149, figs. 27-30. 
(1) ,, levis Walker, 1903a, p. 55, pl. x. figs. 70-76. 
South Orkneys, Scotia Bay, Station 325; 9-10 fathoms. June 1903. One 
male, not well preserved. 
Station 201, lat. 59° 43’S., long. 30° 44’ W.; in clear water among floe, surface. 
13th February 1903. Temperature 30°1. One female. 
Off Coats Land, lat. 72° 31’ S., long. 19° 00’ W.; vertical net, 1-1000 fathoms. 
5th March 1904. Temperature 30°. One female. 
Station 411, Coats Land, lat. 74° 1’S., long. 22° W.; 161 fathoms. One specimen. 
These specimens agree in nearly all respects with the description given by 
Curvreux of #. latucarpus. The females agree with his, and differ from the male in 
