ORCHESTIA PARVISPINOSA. 165 
length as the propod, it bears a well marked rounded lobe 
on the hinder margin towards the distal end; the propod 
widens distally to the usual rounded lobe which widens 
gradually from the base of the propod; the finger and 
palm do not reach quite to the end of the lobe; the setae 
on the gnathopod are few and small; the basos, ischium 
and merus bear two or three on the hinder margin in 
each case, the carpus has three proximal to the lobe and 
another three on its distal margin, and there are three 
spaced along the anterior margin of the joint, the propod 
similarly has three small tufts on the anterior margin, 
those at the base of the finger being more slender than 
the others, there is a row of four marking the junction 
of the lobe with the joint proper, four others are placed 
on the lobe itself and three slender hairs are placed at the 
end of the palm. 
In the second gnathopod of the male (Fig.2) the side-plate 
is rounded below and bears about seven small setae, poste- 
riorly it is produced into a subacute process, with a deep 
emargination above it; the basos is rather broad except 
at the narrowed base, the merus is produced distally into 
a small rounded lobe, the carpus is short, subtriangular, 
the propod is broadly oval, the anterior margin convex 
and without setae except two very small ones at the base 
of the finger, the whole posterior margin is very convex 
and about half of it is occupied by the palm which is 
slightly oblique and is fringed with six small setae and 
has a shallow groove or pocket at the end into which the 
end of the strongly curved finger fits; the whole appendage 
is almost free from setae with the exception of those already 
mentioned, 
In the female the first gnathopod (Fig. 3) is of the usual 
form and presents nothing noteworthy except that the propod 
is shorter than the carpus and is narrowed distally so that 
there is no appreciable palm and the gnathopod might 
be described as simple. The setae are rather long; their 
arrangement will be best learnt from the figure. 
Notes from the Leyden Museum, Vol. XXXIV. 
