Pomona College, Claremont, California 3 



Amphiuridae 



One to five mouth papillse. Arms arising from ventral side. Two genital bursae. 



Amphiodia barharae Lyman 



III. Cat. M. C. Z. Harvard, 8, pt. 2, p. 17, pi. 3. 1875. 



Medium size. Arms twelve or more times diameter of disc. Oral papillae six, 

 equal and regularly arranged. Teeth. No tooth papillae. Two short, flat tentacle 

 scales. Three tapering arm spines. Color yellowish or tinged with green. 



Deep in sand at Balboa. Young in sandy pool on shells. Rare. 



Ophionereis annulata Le Conte. 



Proc. Acad. N. Sc. Phila., 5, p. 317. 1851. 



Medium size. Arms about six times diameter of disc. Mouth papillas numerous. 

 Teeth. No tooth papillas. Three flattened, stout arm spines. Color light, arms dis- 

 tinctly banded. 



Young in sponge masses. Young and adults among beds of Mytitus, Lepas and 

 Mitella; in sand under loose rocks, and in rocky tidepools among Funis and green 

 algae. Common. 



Ophiocomidae 



Mouth papillae. Teeth. Arms arise from ventral side of disc. Two genital 

 bursae. Mouth shields small or medium. 



Ophiopteiis papulosa Lyman. 



111. Cat. M. C. Z. Harvard, 8, pt. 2, p. II. 1875. 



Large and coarse. Arms three or four times diameter of disc. Disc completely 

 covered above by stout stumps. Few mouth papilla?. Five flat, blunt arm spines. 

 Color deep brown, arms often faintly banded. 



In rock ledges with ground shell or sandy bases. Associated with the echinoid 

 S. purpuratus Stimp. around the mouth region of which there is often a member of 

 this species of opliiuran. Rare and restricted. 



Ophiothricidae 



Plates on upper side of arms small. No oral papillae. Tooth papillae. Few 

 buccal papillae. 



Upliiothrix spiiulala Le Conte. 



Proc. Acad. N. Sc. Phila., 5, p. 318. 1851. 



Variable size. Arms five or six times diameter of disc. Disc covered with 

 thorny spines. No mouth papillae. One tentacle scale. Seven long arm spines. 

 Color greenish brown, red or yellowish. Arms with orange bands. Mouth usually 

 whitish. Some have red discs. Color variation in this species is extraordinary; 

 apparently there is no uniformity. 



In Macrocystis holdfasts; in rocky tide-pools with Fucus; in mussel-beds with 

 Mytilus, Lepas and Mitella. Young also found in calcareous sponge masses, and 



