> —. 


1923.] Zoological Results of Expedition to Yunnan. 443 
lateral border. The sub-orbital lobes, which are defined infe- 
riorly by a finely crenulate rim, are quite smooth and the 
side-walls bear numerous fine striae. 
The epigastric and post-orbital crests together form a 
common curve, but the former are greatly advanced in the 
middle, extending much beyond a line joining the posterior 
border of the orbit. The strongly oblique edges of the epigas- 
tric crests bear transverse tuberculate rugae, but the surface 
immediately behind the crests is smooth except for the pits, 
which are here unusually coarse. The post-orbital crests are 
rather blunt and are separated from the epigastric by a dis- 
tinct groove. Their edges are broken up into rugae which, 
towards the lateral margin, merge indistinguishably with the 
tubercles on the anterior part of the epibranchial region. The 
crests curve obliquely backwards towards the antero-lateral 
margin, but do not meet it. They terminate far behind the 
epibranchial tooth, the latter being midway between them and 
the outer orbital angle. 
e front is moderately declivous; its edge is faintly 
crenulate, concave in the middle and with the outer angles 
rather sharply rounded. Behind the strongly raised edge the 
surface on either side is a little tumid (much less so than in 
P. pealianum) and is smooth save for a few low scattered 
tubercles. The lateral edges are smooth but both upper and 
the genus. The gap below the outer orbital angle is small and 
obscure on the right side, completely absent on the left. 
The antero-lateral borders are about as Jong as the pos- 
tero-lateral. They are strongly raised, sharply serrulate, mod- 
erately curved and posteriorly turn a little inwards on to the 
dorsum of the carapace. About 22 serrations can be counted 
behind the epibranchial tooth and 4 or 5 in front of it. The 
epibranchial tooth is a little larger than any of the serrations 
but does not differ from them in character. 
The abdomen of the male is coarsely pitted. The proxi- 
mal breadth of the 6th segment is about 2°3 times its median 
length. The 7th segment is bluntly rounded and about three- 
quarters as long as broad. : 
The ischium of the third maxilliped is coarsely pitted, 
with a shallow longitudinal groove ; the merus is considerably 
broader than long. In both exopodites the flagellum is com- 
pletely absent. 
