184 First Annual Report 
of epimera four and a little behind. Anus at the posterior, ventral 
corner of the body, and has two lateral flaps. Mandibles project 
downward. First four joints of the palpus sub-equal in length and 
the fifth joint about half as long and somewhat dentate, as shown in 
the side view of the mouth-parts. Palpus not quite as strong as the 
legs. Color from orange to almost colorless, marked on the dorsum 
with a black cross as shown in the smaller figures. Three pairs of 
bristles project in front and one pair behind as shown in the side 
view. Legs without true swimming hairs but furnished with stout 
spines. Claws with rudimentary combs suggesting those of the 
Halicaride. They also fold back into grooves in the end of their 
tarsi. 
Figure 102. Pontarachna cruciata 
Habit sketch and detail of side view of mouth parts. 
Differs from P. punctulum in size of palpus, general arrangement 
of epimera, color, ete. The curved spur-like processes characteristic 
of the genus are entirely lacking as are also genital covers and hairs 
on the ventral surface. Leg four a little longer, and the other legs 
a little shorter than the length of the body. Differs from P. terges- 
tina in the shape of mandible, absence of swimming hairs; from P. 
lacazei in the proportions of the palpus, unenclosed condition of the 
genital opening, and other features. Many specimens in tide-pools 
and towed from Phyllospadix, Laguna Beach, July. 
