CRUSTACEA. 
I.—DECAPODA. 
By W. T. Cauman, D.Sc. 
Two species of Decapod Crustacea were obtained by the ‘Discovery’ within the 
Antarctic Circle. They have been identified with the two species collected by the 
German Polar Commission of 1882-1883 at South Georgia. By the courtesy of Dr. 
Georg Pfeffer, of the Hamburg Museum, who first described the species, I have been 
able to compare the ‘Discovery’ specimens with co-types from South Georgia, and to 
satisfy myself of their identity. With the circumpolar range implied by their 
occurrence at these two widely separated points, both species combine a remarkable 
range in depth, for, whereas at South Georgia they were found at 7-9 fathoms, the 
‘Discovery’ dredged both species at depths reaching to 500 fathoms.* Dr. Pfeffer’s 
descriptions, although very detailed and accurate, leave unnoticed certain characters 
which are now regarded as of systematic importance. I have, therefore, found it 
necessary to supplement his account on some points. One of the species, Crangon 
antarcticus, has received some attention in recent discussions on the subject of 
“bipolarity,” and I have therefore attempted to define a little more precisely its 
affinities with related forms. 
FAMILY HIPPOLYTIDA. 
CHORISMUS ANTARCTICUS. 
Hippolyte antarctica Pfeffer, Jahrb. Hamburg. Wiss. Anst. IV. (1887), p. 51, pl. i. figs. 22-27. 
Description of ovigerous females.—Total length 87 to 101 mm. Length of carapace 
(including rostrum) about two-fifths of total length of body. Rostrum equal to or a 
little longer than the distance from the orbital notch to posterior margin of carapace 
in the middle line, curved upwards, moderately expanded below ; upper margin with 
eight or nine teeth, of which the second is placed over, or a little in front of, or 
* Crangon antarcticus was also dredged by the ‘ Belgica’ at a depth of 400-500 fathoms in Lat. 71°S., 
Long. 88° W. 
