Laguna Marine Laboratorp 185 
Pontacarus californicus n. sp. 
(Figure 103) 
Length 428-542 mierm. Outline of abdomen gradually narrowing 
from broad shoulders to bluntly rounded end. Cephalothorax small 
and triangular. Palpi widely separated at the base, four-jointed, 
longer than the mandibles and movable. First two pairs of legs 
of equal diameter, the first a little the longer. Fourth joint of palpus 
with distal segment shorter than proximal. Armor very weak; out- 
lines of the various plates too indistinct for good characters. Strongly 
pigmented eye-spots behind which a strong spine projects to the side; 
another shorter and weaker spine arises 1n front of and medially from 
the eye. The mandible ends in a stout claw. No feathered hairs on 
the legs. Twelve long hairs project from the posterior margin of 
the abdomen. Claws on the legs without combs, and no grooves on 
end of tarsus. 
Figure 103. Pontacarus californicus 
Quite common under stones well down toward the low tide mark. 
Many were also found in towings from Phyllospadix. Body of the 
female distended with eggs and consequently larger and more irreg- 
ular in outline than that of the male which is shown in the figure. 
This species differs from P. basidentatus in having a short proboscis 
and no feathered hairs on the legs. 
Rhyncholophus arenicola n. sp. 
(Figure 104) 
Length .785-1 mm. First three legs about the length of the body, 
the fourth pair about one-third longer. Usually bright red (one 
straw-colored specimen). Body variable in shape but usually broad- 
est in the middle and broadly rounded behind, thickly clothed with 
