90 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
same; but it is a little less convex, and the antero-lateral 
margins are comparatively a little longer than in the Japanese 
species. In the form and the structure of the front and of the 
orbits, both species are alike. The front is slightly declivous, 
straight, and divided by a small median triangular notch into 
two truncated lobes; the anterior margin is distinctly trans- 
versely sulcated, and the two lobes are a little prominent in the 
middle ; so that the front is perfectly similar to that of #. 
crenata. The internal angle of the upper orbital margin is 
described by Haswell as being acute ; but in our specimens it re- 
sembles E. crenata only when the carapace is viewed from above ; 
when, however, the front orbital region is looked at anteriorly, 
the internal orbital angle appears obtuse, though transversely 
carinated. As in Heteroplax, the internal orbital hiatus is 
occupied by a process of the base of the antenne, so that the 
flagellum is excluded from the orbital cavity; the flagellum 
therefore appears in the hiatus between the internal orbital 
angle and the front, when the carapace is looked at from above. 
The flagellum is a little longer than half the length of the 
cephalothorax. The upper margin of the somewhat oblique 
orbits presents two fissures, one about the middle, and*the 
other near the external angle; the inferior orbital margin also 
presents a small hiatus near the external orbital angle. The 
internal lobe of the infraorbital margin is dentiform, and projects 
a little more forwards than the internal angle of the upper 
margin. It is separated by a small emargination from a second, 
though smaller and less prominent lobe of the infraorbital margin, 
situated on its interior half. 
The antero-lateral margins are much shorter than the postero- 
lateral, and are armed with four teeth, including the external 
orbital angle. These teeth are rather acute and nearly equal, the 
third being, however, a little longer and slightly more prominent 
than the others, and the fourth being the smallest of all; they 
are all more or less distinctly carinate above. The antero-lateral 
margins are little oblique, so that the carapace is rather narrow. 
The external elevated margin of the last antero-lateral tooth 
extends backwards for a short distance, thus constituting the 
postero-lateral margin ; but it soon disappears, so that the pos- 
tero-lateral margin becomes undefined. A little more inwards, 
however, on each side of the upper surface of the carapace, a 
ridge-like, longitudinal, somewhat rugose elevation is found, 
