NO. 2 ZIESENHENNE: NEW OPHIURANS 19 



Color. — Dried specimen, disk dull j^ellow, with a grayish hue, only 

 the distal ends of the radial shields whitish. Arms and arm spines light 

 brown with irregular darker markings on the dorsal arm plates and 

 spines. Under side grayish brown with some markings of darker brown 

 on the under arm plates. Color in life green and brown, much like 

 Ophiactis savignyi (M. & T.) or young Ophiocoma alexanderi Lyman 

 and not at all like an Ophiophragmus. 



Types. — Holotype, AHF no. 10; 169 paratypes, 51 in M.C.Z. 



Type locality. — Station 403-35, shore, Manta, Ecuador, January 20, 

 1935. An additional 159 paratypes as follows: 50 from Station 474-35, 

 shore, Salinas Bay, Costa Rica, February 10, 1935; 2 from Station 207- 

 34, shore, south of Point St. Elena, Ecuador, February 8, 1934; one from 

 Station 415-35, 45 fms., south of Port Utria, Colombia, January 24, 

 1935; 5 from Station 229-34, shore, Cabita Bay, Colombia, February 13, 

 1934; 97, 51 in the Museum of Comparative Zoology, from Station 848- 

 38, shore. Cape San Francisco, Ecuador, Februaiy 23, 1938, and 4 from 

 Station 400-35, shore, Manta, Ecuador, January 19, 1935. 



Remarks. — The fine scaling of the disk without primaiy plates, the 

 slender marginal papillae, the narrow and long radial shields, the rela- 

 tively short arms with rather slender arm spines, and the triangular oral 

 shields make a combination of characters that readily distinguish this 

 species from other known members of the genus. The coarse disk scaling 

 of O. marginatus Liitken and O. chilensis Lyman separates those forms at 

 once, while the oral shields, arm plates, arm spines, and the marginal 

 papillae set it apart from O. paucispinus Nielsen and O. tabogensis 

 Nielsen. This species lives in algae, in sponges or under rocks, in tide 

 pools, more or less gregariously. Adults are likely to be more or less 

 buried in the sand, often several together. Owing to the marked super- 

 ficial resemblance to Ophiactis savignyi (M. &T.) in color, form, and 

 habits, the specific name ophiactoides has been chosen. 



Ophiophragmus papillatus, new species 

 Plate 4, Figs. 1-3 



Description. — Disk diameter, 3.6 mm.; arms, 18 mm. long. Disk 

 thick and rounded, arms short and heavy. Disk covered with circular 

 overlapping scales; those in contact with the radial shields slightly larger. 

 The large, distinct, circular central plate is surrounded by 5 oblong radial 

 plates almost twice as broad as long. Primary plates separated by the 



