222 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
Polyonyx, and it seems almost a certainty that Haswell’s species 
is also a representative of this subgenus. It appears to be dis- 
tinguished from P. transversa by the upper surface of the carapace 
not being lineolate on its posterior half, by the protogastric lobes 
being not at all prominent, by the shape of the front, by the dis- 
tinctly crested lateral margins, by the absence of a conical tooth 
at the base of the immobile finger of the hands, and probably by 
other characters, which will become manifest when both species 
are compared with one another. 
P. Euphrosyne belongs to that small number of species in which 
the cephalothorax is much broader than long, the proportion of the 
breadth to the length being the same as in P. transversa. The 
upper surface is very convex longitudinally, and the lateral regions 
are very declivous towards the lateral margins, but the middle of 
the cephalothorax is transversely flattened. The regions are 
faintly indicated, and the upper surface is smooth and glabrous, 
except near the lateral margins, which are densely hairy. The 
front is rather narrow, measuring only a fourth of the breadth of 
the cephalothorax ; it presents a much deflexed, scarcely promi- 
nent, subacute, median lobe, which projects a ttle more forward, 
z.e. more downwards, than the rounded lateral angles, which are 
formed by the internal angles of the orbits. The front is some- 
what hairy above. The fronto-orbital margin therefore resembles 
somewhat that of P. (Polyonyx) obesula, White (Miers, Zoology 
of the Voyage of H.M.S. ‘ Alert,’ 1884, pl. xxix. fig. D), but it 
is comparatively broader in that species. The orbits are compara- 
tively small, like the eyes themselves; the external angles of the 
orbits are rounded or obtuse, not at all prominent, and the fronto- . 
orbital margin passes continuously on either side into the lateral 
margins, which are distinctly carinate and prolonged backwards 
about to the posterior third. At some distance from the orbits 
the carinate lateral margins are interrupted by the lateral portions 
of the cervical suture ; but uo epibranchial tooth is found at that 
interruption. The posterior margin of the cephalothorax is 
slightly concave. The inflected sides of the carapace close to and 
below and behind the lateral margins are marked with some oblique 
rugose lines. The external antenne are about twice as long as 
the length of the cephalothorax; the first exposed joint is un- 
armed, the second is a little longer and thinner than the first, 
wud the third is the smallest of all, being only half as long as the 
second. The external maxillipeds have a quite smooth, glabrous, 
