166 ORCHESTIA PARVISPINOSA. 
The second gnathopod of the female (Fig. 4) has the side-plate 
similar to that of the male, but with the posterior process 
rather more distinctly marked off from the margin below 
it and with a shallower emargination above it, the basos is 
rather broadened throughout, there are the usual rounded 
lobes on the merus, carpus and propod, that on the last 
extending well beyond the short oblique palm, a row of 
about ten small setae extends along the propod at the line 
of separation between the joint and the rounded lobe; the 
remaining setae are few and small. 
The basal joints of the third to fifth peraeopods have 
the posterior margin well rounded with minute serrations, 
a minute seta being placed in each serration, the anterior 
margin bears a number of spinules; in the fifth peraeopod 
the basos is as broad as long. In both sexes the finger of 
the second peraeopod is not abruptly narrowed at the nail 
but resembles that of the first. 
The three pleopoda are well developed and of about 
equal size. 
The first uropod has the base longer than the equal 
branches, each of which in the female bears three spinules - 
on the lateral margin in addition to those at the distal end ; 
in the male the outer branch has no lateral spinules. The 
second uropod (Fig. 5) has the base as long as the inner branch 
which is a little longer than the outer, both branches bear 
three or four lateral spinules and a group of four of varying 
sizes at the end; there are three spinules on the upper 
lateral margin of the base and a longer one at the end. 
The third uropod (Fig. 6) has the base broad and longer than 
the small conical single branch; there are two spinules on 
the upper margin of the base and one or two at the end 
of the branch. 
In the maxillipeds the fourth joint of the palp is absent 
altogether or represented by the barest vestige so that the 
species is properly placed under Orchestia, though in the 
somewhat long setae on the antennae and peraeopoda and 
Notes from the Leyden Museum, Vol. XXXIV. 
