Hydroids Near Laguna Beach 



Arthur S. 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. 



Tubiilaria crocea. 



DD. Branched sparsely. 



Tubular ia sp. 



BB. Hydranth with distal, knobbed tentacles. 



Syncoryne mirabilis. 



AA. Hydranth with hydrotheca. 



B. Hydrotheca sessile. Gonangia are sporosacs. 



C. Hydrotheca in two rows, usually opposite, on the stem. 



D. Hydrotheca margin with two teeth. 



Sei'tularia furcatn. 



DD. Hydrotheca margin smooth, tubular, adnate at 

 base. 



Sertularia tricuspidata. 



