Tig 
According to Kishinouye, the colour or tne Japanese P. 
monodon is dark brown, or rarely blackish. 
Locality —Neighbourhood of Durban and Port Elizabeth. 
Penaeus caeruleus, 1. sp. 
Plates XXI and XXII bis. 
The rostrum slightly sinuous, its carina continued back- 
wards almost to the hind margin of the carapace, the dorsal 
teeth seven, of which the hindmost is less distant from the next 
preceding than the foremost is from the apex, the ventral 
teeth three, the middle and hindmost respectively a little in 
advance of the foremost dorsal tooth and the next behind it ; 
all the teeth are accompanied by a series of setules. 
The pleon has the fourth, fifth, and sixth segments carinate, 
the last the most sharply, this ending in a small tooth. The 
telson is longer than the sixth segment, but considerably 
shorter than the uropods. It tapers to a sharp point, and 
has the sides for at least the distal half fringed with feathered 
sete. It is medio-dorsally sulcate except near the base 
and apex. 
The eyes have many plumose sete on the stems, which are 
coloured like the rest of the body, but the corneal part is brown. 
First antennae. In the first joint the spine of the outer 
margin is not very elongate, on the other side there is a sub- 
marginal ridge; the laminar appendage is nearly as long as 
the joint, with its apex slightly widened and rounded, the 
hollowed joint and curving appendage alike thronged with 
feathered sete. The second joint is shorter than the first, 
nearly twice the length of the third, both setiferous. The 
flagella appear to be sub-equal, about as long as the peduncle, 
rather broad for some distance from the base, well furnished 
with sete on the broad part. 
Second antennae. The broad scale reaches a little beyond 
the peduncle of the first antennae, and nearly to the apex of 
the rostrum. Its thickened outer margin is smooth and ends 
in a tooth, from which the apical margin slopes forward, 
its fringe of sete curving round in continuity with that of 
the inner margin. The peduncle is short, the flagellum longer 
than the animal’s body. The mandibles have the cutting- 
plate and molar in coalescence, the second joint of the palp 
