UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 1 1, No. 6, pp. 127-142, pis. 3-4 August 30, 1913 



PYCNOGONIDA FROM THE COAST OF 

 CALIFORNIA 



WITH DESCRIPTIONS OF TWO NEW SPECIES 



BY 



HARRY V. M. HALL 



The following paper is based upon the collections of the 

 University of California which include certain material from 

 the Bay of San Francisco, and that collected by me during the 

 summers of 1911 and 1912, at Laguna Beach, California, in 

 connection with the Marine Laboratory- of Pomona College. 

 This collection from Laguna Beach, which I have donated to the 

 Museum of the University of California, includes over sixty 

 .specimens, most of which belong to the commonest species, 

 namely, Ammothella bi-unguiculata Dohrn var. calif or nica 

 Hall. Five other species in as many genera are also represented. 



The habitat from which the specimens were taken admits of 

 little generalization, owing to the varied character of the coast. 

 Most of them were taken from the under sides of stones lying 

 on sandy or gravelly bottom between tide marks, some from Fucus 

 growing on rocky ledges or large stones, a few from red algae 

 growing in rock-bound tide pools, and still others from among 

 the bases of PhyUospadix which grows in the mud and sand at 

 the extreme low tide mark. The whole coast is open to the surf 

 in the vicinity of Laguna Beach, but is rather varied in structure. 

 Rocky headlands of sandstone, some of it homogeneous and some 

 a coarse conglomerate, furnish attachment for a great variety of 

 animal and vegetable life, as do also the broken fragments of 

 all shapes and sizes which strew some of the beaches between 



