Stegophiura ponderosa (Lyman), new combination, and Amphiophiura vemae and Homophiura nexila, new species (Echinodermata: Ophiuroidea) from the R/V Vema collections. Proceedings of the Biological Society of Washington, 100(2) 1987: 249-256. 254 [Zoological Record Volume 124]