Notes on Some Small Crustacea from the “ Goldseeker” Collections. 5 
Dr. Calman, in describing the species, remarks that “The characters 
of this peculiar form do not coincide with those of any of the admitted 
genera of Diastylide ;” and the Rev. T. R. R. Stebbing, in describing 
a closely allied form for which he has established the genus Dic. and 
the family Dicide, alludes to Calman’s species and says—‘ I venture 
to think that it will prove to be a species of the new genus here 
instituted.”* As the “Goldseeker’s” specimens appear to be 
identical with Calman’s species, which in turn agrees so closely with 
the form described by Stebbing, I have ventured to place it in the 
genus instituted by that author. 
DESCRIPTION OF A LARGE OSTRACOD. 
Genus Gigantocypris, G. W. Miiller, 1895. 
Gigantocypris (2) pellucida, G. W. Miiller. Plate IT. 
1895. Gigantocypris pellucida, G. W. Miiller, Bull. Mus., Comp. 
Zool) Harvard. Vol. XXVIE; No. 5,:p. 164; Ph 1;,6,7, 14, 
16, 22, 23; Pl. 2, fig. 11. A 
Shell subglobose, rather longer than broad when viewed from the 
side, but seen in front the width is slightly greater posteriorly. 
Antennal notch small and near the anterior end. LHyes large, 
contiguous, and of a brownish colour. The valves are open along the 
ventral aspect, and about half-way round the proximal end to a little 
beyond the antennal notch; round the distal end and along the entire 
dorsal aspect they are closely joined together and almost coalescent, 
their junction being indicated only by a faint inconspicuous line; 
they are also apparently unprovided with any hinge arrangement. 
The valves are chitonous, very thin, semi-transparent, and appear to 
be without any calcareous stiffening. The animal shows dimly 
through the shell, and the long vermiform appendages are distinctly 
seen. T’he surface of the shell, when viewed under a low power of 
the microscope, appears to be covered with very minute prickles. 
Length of the shell, about 15-5 mm. (fully half an inch); width, 
14 mm.; thickness, about 12 mm. 
The antennules are composed of seven joints; the first two are 
tolerably stout, but the others are slender. The first joint is rather 
longer than the second, the second and fourth are nearly equal in 
length, and both are longer than the one intermediate. The fifth joint 
is rather shorter than the preceding one, and the two end joints are 
small. Several elongated setee, some of them ringed, spring from the 
end joints, but the other joints are only provided with a few short 
terminal bristles, as shown by the drawing (Pl. IL, fig. 5). The 
formula shows approximately the proportional lengths of the different 
joints of the antennules :— 
Number of the joints, 1 2 3 4 5 67 
Proportional lengths, 23 15 10 13 11 4 3 
The masticatory process on the basal joint of the mandibular foot 
is undivided, bluntly rounded at the end, and armed with a few short 
tolerably stout gpical spines; the second joint of the mandibular foot 
is considerably enlarged and provided with a stout appendage, slightly 
* Annals of the South African Museum, vol. vi., p- 416 (1910). 
