NO. 2 ziesenhenne: newophiurans 25 



rectangular, proximal margin convex, distal margin distinctly concave. 

 On the basal under arm plates are 2 longitudinal grooves that divide the 

 plate into a small, oblong center ridge and 2 lateral broader ridges that 

 appear somewhat like supplementary plates, but the plate is not divided. 

 Beyond the disk margin the grooves disappear and the plates are smooth, 

 with parallel lateral margins and convex proximal and concave distal 

 margins. They are fully in contact. One large tentacle scale, longer than 

 wide, widest proximally, almost as long as under arm plate, attached to 

 the lateral margins of the under arm plate. 



Color. — Dried specimens were pale variegated gray above and dull 

 white below; arms purple gray with irregular white bands. 



Types. — Holotj'pe, AHF no. 20; 20 paratypes. 



Type locality. —Station 764-38, 15-20 fms., off White Friar Rocks, 

 Guerrero, Mexico, January 8, 1938. Twenty paratypes as follows: one 

 from Station 121-33, shore, Tenacatita Bay, Mexico, March 16, 1933; 

 2 from Station 212-34, 45-55 fms.. La Plata Island, Ecuador, February 

 10, 1934; 3 from Station 259-34, 18 fms., Tangola-Tangola Bay, Mexi- 

 co, February 28, 1934; one from Station 265-34, 5-10 fms., Petatlan 

 Bay, Mexico, March 3, 1934; 2, one in Museum of Comparative Zo- 

 ology, from Station 765-38, 5-10 fms., Chacahua Bay, Mexico, January 

 9, 1938; 3 from Station 927-39, 4-12 fms., Chacahua Bay, Mexico, 

 March 22, 1939; and 8 from Station 964-39, 2-8 fms., Tenacatita Bay, 

 Mexico, May 8, 1939. 



Remarks. — This species is closely related to O. violacea Liitken, from 

 which it differs by the single tentacle scale, the grooved under arm plates, 

 and the more complex rosette arrangement on the disk. From O. tabogae 

 Nielsen, it differs by the shape of the radial shields, semi rosette arrange- 

 ment of the disk scales, and the unique under arm plates. The curious 

 sculpturing of the basal under arm plates and the very small oral shields 

 will distinguish this species from any other known member of the genus. 

 The name sculptilis has reference to the characteristic basal under arm 

 plates. 



Genus OPHIOCNIDA Lyman 



Ophiocnida californica, new species 

 Plate 5, Figs. 4-6 



Description. — Disk diameter, 6 mm. ; arms, 34 mm. long. Disk pen- 

 tagonal, thick, covered with irregular scales radiating from a central 

 primary plate. Scales overlapping, those surrounding the radial shields 



