184 



Jfirst annual deport 



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 

 HalicaridaB. 

 tarsi. 



They also fold back into grooves in the end of their 



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, etc. 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 PhyllusiJiidix, Laguna Beach, July. 



