110 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
obliquely forwards. In the adult male the antero-lateral margin * 
of the carapace makes a very obtuse angle with the postero- 
lateral, so that the former is easily distinguised from the latter, 
when the upper surface of the carapace is viewed from above, 
as infig. 2. But at a somewhat younger age the postero-lateral 
margin often does not form an angle with the antero-lateral, so 
that in these individuals both margins form a single straight line 
which extends obliquely backward from the external orbital angle. 
The upper surface of the carapace therefore in these cases has a 
somewhat different shape, and a specimen presenting this cha- 
racter has been figured by Mr. Hilgendorf (Taf. iv. fig. 1). But 
in other males of the same size the carapace resembles that of the 
first described adult form. In tie female, the lateral margin often 
appears minutely granular, but it is smooth in the male. In the 
adult male the postero-lateral margin becomes indistinct long 
before it reaches the posterior margin of the carapace, but in 
the female it remains visible for more than half its length. In 
consequence of this oblique course of the lateral margins, the 
carapace is much narrowed posteriorly and is broad in front. 
The inferior margin of the orbits is minutely crenulate, both in 
the male and in the female, except a small internal portion of 
it, about as long as the external antenne, which is entire. This 
inferior orbital margin appears everywhere simple, and does not 
present even a trace of that accessory line which occurs very 
distinctly in Gelasimus forceps, M.-Eaw. The pterygostomian 
regions are very convex, somewhat rugose, and covered with 
short hairs, both in the male and in the female. 
The male abdomen closely resembles that of Gelasimus arcu-_ 
atus, de Haan, the fifth joint being the longest of all, and the 
sixth being a little shorter than the fourth. 
In its general appearance the larger chelipede of the male 
seems closely to resemble that of Gelasimus arcuatus of the 
‘Fauna Japonica.’ The upper margin of the arm is a little 
granular, and the anterior margin is provided with some small, 
acute, unequal teeth at its distal end; the anterior and the 
* The epibranchial angle is that point where the lateral margin of the 
cephalothorax is crossed by the oblique line which is found on the lateral surfaces 
of the carapace. The antero-lateral margin is the line between the external 
orbital angle and the epibranchial angle; and the postero-lateral margin is the 
rest of the lateral margin. 
