100 first Annual Report 
NOTES ON THE CRUSTACEA OF LAGUNA 
BEACH 
Cc. F. BAKER 
From the character of the coast at Laguna one would expect a 
rich representation of the crabs, shrimps, prawns, and their allies, 
and the richness of the crustacean fauna is most forcibly impressed 
upon one by a little collecting. We took a great number of specimens 
and species of crustaceans during this first summer, of which but a’ 
very small proportion have as yet been worked up, especially among 
the Entomostraca. <A few of these latter I have examined in some 
detail in cases where they happened to be conspicuous or to occur 
in great numbers of individuals. Miss Stout has done a considerable 
amount of work on the Amphipoda of this locality, and Miss Stafford 
on the Isopoda. They both accumulated a great wealth of material, 
indicating a littoral fauna of great richness in these groups. 
The erabs, but few of which I have determined, are extraordin- 
arily abundant. The tide-pools swarm with them, a stone turned 
over frequently revealing a half dozen species at one time. One 
small crab, apparently quite rare, was of peculiar interest because 
it seemed to be always covered with a dense forest of small simple 
sponges, perhaps indicating a symbiotic relationship. 
A number of species of parasitic copepods (three from one 
shark) and isopods were taken, but these are as yet undetermined. 
MALACOSTRACA 
Order DECAPODA 
Epialtus productus Randall 
The young of the kelp crab are very common in the tide-pools 
clinging to fueus and other brown alge, but mature specimens are 
only to be found in the kelp beds. 
Loxorhynchus grandis Stimp. 
Large carapace shells of this deeper water crab are commonly 
vashed up on the beach. 
Cycloxanthops novemdentatus Lock. 
Frequent under stones between tides. 
Lophopanopaeus leucomanus (Lock.) 
(Figure 53) 
Occasional under stones between tides. Examination of the ap- 
pendages of the head of this species, in comparison with those of 
