OSTRACODA, 7 
(fig. 5), pomted in front, broadly rounded behind, the lateral margins very boldly 
arcuate, greatest width situated behind the middle and equal to two-thirds of the 
length. The surface of the shell is smooth, deep ochreous yellow in colour, with a 
conspicuous dark eye-spot within the dorsal margin near the front, just below and 
behind which there is a large irregularly shaped pellucid, sub-circular patch, and below 
this again a series of four oblong muscle spots, arranged in a transverse curve, and 
in front of these two smaller spots the long diameters of which lie in the opposite 
direction. The left valve is the larger of the two, overlapping the right both in front 
and behind. Length 0°65 mm. ‘The shell of the female is somewhat more tumid 
and seen from the side has no ventral sinuosity ; it is also almost free from anterior 
3 
depression, the two extremities being nearly equal in width. 
Two specimens only of this small species were seen, a male and a female; the 
female, however, was only an empty shell and was quite colourless. The exact locality 
of the capture I do not know. The specimens were accidentally discovered in a 
flocculent diatomaceous deposit which settled from the liquid in which the larger 
Cypridinidz had been preserved. The flexuous lateral contour of the male distinguishes 
this from any other species of Xestoleberis known to me. 
LINOCHELES.* 
Differing from the typical Cytheridz in the greatly elongated and thread-like legs 
of the third pair, and in the abnormally formed copulatory plate of the male. 
LINOCHELES VAGANS. 
(Plate III, figs. 11-18.) 
co 
Shell closely similar in shape to Nesfoleberis; seen laterally (fig. 11) that of the 
male is subreniform, greatest height situated behind the middle and equal to much 
more than half the length; anterior extremity narrow and obliquely rounded, posterior 
very wide and evenly rounded, dorsal margin boldly arched, steeply curved posteriorly, 
sloping with a gentle curve to the front, ventral margin sinuated in front of the 
middle; seen from above, the outline is elongated, ovate. widest in the middle 
(fig. 12), width rather less than half the length, narrowed and obtusely pointed in 
front, broader and rounded off behind. Shell-surface perfectly smooth ; colour brown. 
Length, 0°64 mm. 
Antennules six-jointed, very sparingly setiferous (fig. 13); antenne short and 
stout, with short apical claws and a stout urticating seta which reaches to the apices of 
the claws (fig. 14). First and second pairs of legs (figs. 15, 16) armed with short and 
stout terminal claws; third pair much elongated (fig. 17), the last joint extremely 
slender and much longer than the united lengths of the two preceding joints ; terminal 
* Xwor, a thread ; x7An, a claw, 
