Hydroids Near Laguna Beach 
Arthur 8. Campbell 
The hydroid fauna of Laguna Beach has been little studied but 
there are a number of interesting forms to be found there. A few 
collections, made almost at random from time to time, and with 
no special search, form the basis of these notes. 
The excellent papers by Torrey, Calkins, and Nutting have been 
freely consulted in making the determinations. The splendid mon- 
ograph by C. C. Nutting is especially invaluable to all who may have 
to do with a systematic discussion of the group. 
The more valuable results of this short paper are the distribu- 
tional and systematic records, together with notes concerning 
ecological and breeding relations. More extensive studies will re- 
veal much data not hitherto brought to light concerning the 
ecology, life-histories, variations, and other bionomical details of 
the group in this interesting locality. 
KEY TO THE HYDROIDS OF LAGUNA BEACH 
A. Hydranth without hydrotheca. 
B. Hydranth with a basal whorl of filiform tentacles. 
C. Hydranths solitary. Large. Corymorpha palma. 
CC. Hydranths colonial. 
D. Branched profusely. Medium size, often pinkish 
in color. 
Tubularia crocea. 
DD. Branched sparsely. 
Tubularia sp. 
BB. Hydranth with distal, knobbed tentacles. 
Syncoryne mirabilis. 
AA. Hydranth with hydrotheca. 
Bb. Hydrotheca sessile. Gonangia are sporosacs. 
C. Hydrotheca in two rows, usually opposite, on the stem. 
D. Hydrotheca margin with two teeth. 
Sertularia furcata. 
DD. Hydrotheca margin smooth, tubular, adnate at 
base. 
Sertularia tricuspidata. 
