1909] McClendon: The Ophiurans of the Sam Diego Region. 51 



June 20, 1901, 43 fathoms. XXIII-2, June 22, 1901. XXVII-b. XXVIII 

 a, off Isthmus Harbor, between White Bock and Fish Harbor, 12-30 fathoms. 

 XXX, Potts Valley, San Pedro, 20 fathoms. XXXV-a, June 29, 1901, 30 

 fathoms. XXXVI-c. XXXVIII-a, 25 fathoms. XLVI-2, 56 fathoms. L- 

 1 and 2, off Pt. Loma, 25 fathoms. LXII-1, 17 fathoms. LXVIII-1, San 

 Diego Harbor. San Pedro, Sta. 3, June 21, 1895. San Pedro Sta. 15, Juno 

 29, 1895. Pacific Grove. On kelp roots from Portuguese Bend, June 1, 

 1901. San Clemente. Avalon, 1893. San Pedro Harbor, June 18, 1901. 



Smithsonian: 7474, San Diego Bay, Rosa Smith. 12714, Catalina Har- 

 bor, W. H. Dall, January, 1874 (c 6), 40 fathoms. 12643, Catalina Harbor, 

 W. H. Dall, January, 1874 (c 7), 40 fathoms. 12722, San Diego, Rosa 

 Smith, ac. No. 14099. 12734, Catalina Harbor (c 32), U. S. N. M., 40-60 

 fathoms. 



Albatross stations: 3576. 3620, San Diego Bay. 



Ophiothrix rudis Ly. 



Figs. 30, 31. 

 Bull. Mus. Comp. Zool. Harvard, III. pt. HI, p. 239, pi. Ill, 1S74. 



Diameter of disc 11 mm. Length of arm about five times 

 diameter of disc. Disc covered with cylindrical spines, which 

 bear microscopic thorns. Radial shields bare. Almost touching 

 without. Numerous tooth papillae. No mouth papillae. Mouth 

 shields quadrilateral, the inner angle obtuse, outer angle right 

 and lateral angles acute. Side mouth shields narrowed and sep- 

 arated within. Genital openings beginning outside mouth shield. 

 Tentacle scale similar to a small arm spine. Ventral arm plates 

 cpiadrangular with corners cut off. Dorsal arm plates fan shaped. 

 Five to six minutely serrated arm spines (including tentacle 

 scales), the first (dorsal) or second being the longest and about 

 31/2 times length of arm joint, the rest decreasing in length down- 

 ward. The general moss green color and character of the spines 

 makes the animal resemble seaweed. Disc above green, often 

 with reddish or bluish tinge. Radial shields sometimes with a 

 few red or orange spots. Arm green (often yellowish) above 

 with narrow fuscous and broad red cross bands; almost white 

 below with broad spines usually green. Mouth region pale. 

 Females with ripe eggs in summer. 



Along shore. La Jolla. Salinas Cove, June 5, 1901. San Diego Channel. 

 June 18, 1901. Smithsonian: San Diego. (Henry Hemphill), No. 4. 7471, 

 San Diego, C. R. Orcutt (U. S. N. M., ac. No. 14530). Albatross: March 

 15, 1890, Pt. Loma. 



