Some Echinoderms of Laguna Beach 



In the summer of 1915, Prof. A. M. Bean dredged an injured specimen of heart 

 urchin. It seems to be the same as the one labeled Lovena cordiformis Gray, in the 

 museum of the Scripps Institution at La Jolla. 



Since 1915 we have dredged large numbers of the little urchin, Lytechinus 

 anamesus H. L. C, Det. H. L. C. 



The sand dollar Dendraster excentricus Esch. has been dredged every summer, 

 especially off Emerald Bay. It is also very common in places on the mud flats at 

 Balboa and Anaheim Landing. 



The starfish Ludia foliata Grub, has been obtained but once. The starfish Ilen- 

 ricia latinscula Fisher Det. H. L. C, whose central parts were yellow and whose arms 

 had purple tips, has been collected but once, by Mr. Grow in 1916. 



But one specimen of the basket star has been taken. It was determined for us by 

 Dr. H. L. Clark. It is Goryonocephalus eucnemis M. & T. 



The following serpent stars have been found every summer at low tide: Ophio- 

 derma panamensis. Lutk. Det. H.L.C. is the largest species. Ophioplocus esmarki 

 Lyman, Det. H.L.C. Usually unicolored. Ophionereis annulata Le Conte. Compared 

 with Fisher's determined specimens. Ophiothrix spiculata Le Conte. This variable 

 and beautiful form is found in many places, among mussel beds, in holdfasts and 

 dredged. 



Ophiocryptus maculosus Clark. Det. H. L. Clark. These have been collected from 

 holdfasts. 



During the summer of 1917 a curious long-armed serpent star was collected. 

 It was determined for us by Dr. H. L. Clark, but as the disc fell off the determination 

 is not quite sure. "I am cataloging it as Amphiodta bar bane Lyman, known only from 

 Santa Barbara. But the arms of this specimen are much longer than the typical 

 barbai\e, so it may be urtica. One must have the disc to be sure." 



We hope to collect more specimens of this another summer. The holothurians so 

 far are as follows: 



The common Stichopus californicus Stimp. and the large red dredged S. johnsoni 

 Heel. 



Several specimens of a brown Thyone have been obtained. Several red with black 

 tentacles which Dr. Clark thinks may belong to the genus Cucumaria. Another speci- 

 men sent in 1917 to Dr. Clark, "It is apparently Cucumaria curota Cowles." 



In 1914 a single specimen of Psoitis Sp. was obtained. 



White and pink specimens Dr. Clark has determined as Leptosynapta inharens 

 O.F.M. 



(Contribution from the Zoological Department of Pomona College) 



