Laguna @arine Laboratorp 91 
STUDIES IN PYCNOGONIDA, I 
HARRY V. M. HALL 
In all our collecting but twenty-two pyenogonids were taken, 
twenty of which belong to the same species and one of the others to a 
different species of the same genus. The commonest had a spread of 
legs of about three-fourths of an inch, while the other species was 
about three times as large. The latter were so nearly the color of the 
fuecus on which they lived and so covered with debris that it is pos- 
sible that they may be much more numerous than the number taken 
would indicate. In working out this report I am indebted to Dr. 
Leon J. Cole for many kind suggestions and much valuable assist- 
ance. I have described the species found as follows: 
Anoplodactylus californicus n. sp. 
(Figure 49) 
30dy rather short, lateral processes about as long as their own 
diameter, radiate, with bases contiguous. First two intersegmental 
lines barely visible. Proboseis cylindrical with rounded end, almost 
as long as the length of the body. Diameter of the proboscis one- 
half its length. Eyes not apparent, but a large conical eye tubercle 
(bent to the right in the cut as is also the abdomen) arises from the 
anterior edge of the body which projects over nearly the first half 
of the proboscis. The abdomen is much the same shape as the last 
joint of a man’s middle finger and, like the eye tubercle is deeply and 
closely pitted. The rest of the body is pitted but less deeply. Cheli- 
fores large with well developed chele and stout shaft, the whole 
reaching about half their length in front of the proboscis. (In my 
specimen the chele are extended straight in front but there seems to 
be no reason why they might not be bent in front of the proboscis.) 
A few short spines on the chele; basal joints grown together and 
apparently supporting the eye tubercle. Palpi and ovigerous legs 
very rudimentary and wholly within the body (see plate for details). 
The legs are rather long but stout, sparsely set with short spines. 
First coxa shorter than its diameter, second coxa over twice the 
length of the first and enlarged at its distal end, third coxa one and 
one-half times the length of the first. Femur longer than the com- 
bined length of the coxe. Tibial joints each about three-fourths the 
length of the femur. All joints of the legs stout. Tarsus about one- 
half the length of tibial joints; claw two-thirds the length of tarsus 
