Littoral Ophiurans at Laguna Beach 



ARTHUR S. CAMPBEI.I. 



During the summer of 1920 specimens of all species of (jpliiurans previously 

 known to exist near Laguna were obtained. 



Several stations were found to be constant with the various species, some for 

 adults, and others for voung. Several are limited to very special habitats. Two 

 are limited to but one locality each, while O. splailata is found abundantly in almost 

 all stations examined. For the first time O. maculosus was found inshore under 

 stones; previously this species had been known only from kelp holdfasts. 



The excellent plates for this paper are the work of Miss E. Keyes, a student 

 in Pomona College. 

 Ophiodermatidae 



No dental papilla. Buccal papillae numerous. Two or four genital bursa: in 

 each interradius. 



Ophioderma paniimeitsis Liitkin. 



Add. Hist. Oph., 2, p. 193. 1S59. 



Large. Arms, three or oflener four times diameter of disc. Mouth papillar 

 and teeth small. Arm spines numerous, flattened, lying close to arm. Color dark 

 brown above, lighter below, the arms encircled by pale bands. 



Young in Macroeyslh holdfasts. Adults in rocky tidepools among Finns and 

 green algz, ranging up to middle littoral tide pools. Common. 



Opiiiotryptus mttiulosus Clark. 



Third Laguna Report of Pomona College, p. 64. 1915. 



Small. Disc covered with swollen plates concealed by rough granules. Upper 

 arm surfaces more or less covered by granules. Oral shields except madreporite, 

 adoral and oral plates covered completely by granules continuous with above. Five 

 almost conical, subequal arm spines. Two tentacle scales. Color white, grey or 

 with disc marked with reddish granules. Pise in young is red, becoming marked 

 later only by a few red granules, and Anally dirty while in adult. Seventeen arm 

 joints. Arms one and a half times diameter of disc. 



In Macrocystis holdfasts, washed inshore under loose rocks. Young and adults 

 intermingled. Rare. 

 OPHIOr.EPIDAE 



No dental papillx. Three or six buccal papillar. Always i\vo genital bursa, 

 nisc notched. No tooth papillx. 



Opiiioplntus fsmarki Lyman. 



Bull. M. C. Z. 3, pi. 10, p. 227, pi. 5. 



Medium sire. Arms nearly three times diameter of disc. Three arm spines. 

 Disc with plates on both surfaces. Disc and arms flattened. Color light or dark 

 brown, some blue-grey. 



Young in Mmrtiiyslis holdfasts, in calcareous sponges and among red alga; in 

 lide-zone. Adults in rocky tidepools among Funis and green algr; in sand un<ler 

 loose rocks. Abundant. 



