1909] McClendon: The Ophiurans of the San Diego Region. 41 



Suit-order B. Nectophiurae E. Perr, 1891. 

 Spines on arms perpendicular to arm axis. 



Section 1. Oligodontia Ludwig & Hamann, 1901. 

 Tooth papillae few or wanting. 



Family 'V Amphiuridae Ljg. 1867. 

 One to five month papillae, the innermost often infradental. 

 Arms arising from the ventral side. Two genital openings. 



Genus Ophiopholis Mull. & Tr. 1842. 

 Disc more or less covered with grains or little spines. No 

 tooth papillae. Mouth papillae on the sides of the month frames. 

 Arm spines short, flat and stout. Upper arm plates surrounded 

 by a rim of supplementary pieces. The lowest spine of the distal 

 arm joints is a hook. General structure coarse and stout. Two 

 genital openings beginning outside the mouth shields. 



Ophiopholis bakeri sp. nov. 



Figs. 26. 27. 



Diameter of disc 6VL> nun. Length of arm four to five times 

 diameter of disc. Disc (with exception of mouth parts) com- 

 pletely covered with short, thorny spines. Teeth sometimes 

 divided in the middle and having rudiments of papillae. Five 

 pairs of slender papillae. Mouth shields diamond-shaped, cor- 

 ners rounded, nearly twice as long as broad. One long, flat and 

 narrow tentacle scale. Ventral arm plates octagonal, distal, lat- 

 eral and proximo-lateral edges concave. Dorsal arm plates cir- 

 cular, each surrounded by a row of small, round supplementary 

 pieces. Six arm spines in proximal portion of arm, decreasing 

 to four in distal portion, minutely thorny. First spine (above) 

 of variable length, second (longest) a little longer than arm joint, 

 the remainder decreasing in length downward. Color of dried 

 specimen pink or red. 



San Diego M. B. L.: 1025, San Clemente, Station 5, 60 fathoms. 1026, 

 San Clemente, Station 6, 215 fathoms. 1047, 4 miles X.W. by N. of La Jolla, 

 100 fathoms. 1155, 2% miles W.X.W. of La Jolla, 70 fathoms. XXVI-a. 

 LXX-5, Soledad, submerge.! valley, Aug. 23, 1901, 100 fathoms. 1501. 

 1532. 1534. 1537. 1549. 



