Littoral Ophiurans at Laguna Beach 



ARTHUR S. CAMPBELL 



During the summer of 1920 specimens of all species of ophiurans 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 young. Several are limited to very special habitats. Two 

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

 all stations examined. For the first time O. maculosns 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 papillae. Buccal papillae numerous. Two or four genital bursae in 

 each interradius. 



Ophioiierma panamensis Liitkin. 



Add. Hist. Oph., 2, p. 193. 1859. 



Large. Arms, three or oftener four times diameter of disc. Mouth papillae 

 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 Macrocysth holdfasts. Adults in rocky tidepools among Finns and 

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



Ophiocryptus maculosns 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 madreporitc, 

 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. Disc in young is red, becoming marked 

 later only by a few red granules, and finally dirty white in adult. Seventeen arm 

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



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

 intermingled. Rare. 

 Ophiolepidae 



No dental papilli. Three or six buccal papillae. Always two genital bursae. 

 Disc notched. No tooth papillae. 



OphinpluiUS rsmiirki Lyman. 



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



Medium size. 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 Macrocystis holdfasts, in calcareous sponges and among red algae in 

 tide-zone. Adults in rocky tidepools among Funis and green algje; in sand under 

 loose rocks. Abundant. 



