616 THE VOYAGE OF H.M.S. CHALLENGER. 
b. Mouth-spines proper more or less aborted; when present confined in 
an attached membranous sac. Abactinal plating rudimentary, 
microscopic, and not imbricating. Rays ten. Lateral spines 
very long. Ovarial regions very short . : . 5 : remex. 
B. Rays less than ten in number. 
a. Rays six in number. Mouth-spines straight and spiniform. 
a. Abactinal plating extending beyond the ovarial region ; each 
plate with a central tubercle only, bearing a spinelet covered 
with membrane crowded with pedicellarie, One mouth- 
spine proper . : 9 5 . S 5 : 5 : tuberculata. 
6, Abactinal plating not extending beyond the ovarial region ; 
each plate bearing two or three small spinelets, covered 
with simple membrane devoid of pedicellariz, One or two 
mouth-spines proper : ° : 5 : : 
b. Rays nine in number. Mouth-spines subcrescent or scimitar-shaped. 
Adambulacral armature with one inner spine. Abactinal plates 
with three to five small spinelets 3 ° : 5 : 
ce. Disk and number of rays unknown. Probably nearly allied to the 
preceding species, but the segments of the ray are longer. 
Adambulacral armature devoid of an inner spine, except at the 
base of the ray. Abactinal plates with one to three small spinelets 5 attenuata. 
benthophila. 
heroina. 
Chorology of the Genus Freyella. 
a, Geographical distribution :-— 
ATLANTIC : Seven species between the parallels of 50° N. and 10° §. 
Freyella americana, off Nova Scotia. *“Freyella bracteata, off 
the coast of North America, east of New Jersey and Massachusetts, 
and south of Nova Scotia. reyella elegans, between Cape Hatteras 
and Nova Scotia. reyella spinosa, off the coast of the Soudan. 
“Freyella tuberculata, between the Canary Islands and Cape Verde 
Islands, and between the south coast of Africa and the Island of 
Ascension. Freyella sexradiata, dredged by the “ Talisman” (? loc.). 
Freyella edwardsi, dredged by the “ Travailleur ” (? Mediterranean). 
SOUTHERN Ockan: One species between the parallels of 45° and 65° S. 
“Freyella fragilissima, between Marion Island and the Crozet 
Islands, and in the neighbourhood of the pack ice near the Antarctic 
circle. 
Eastern ArcuIPELaco: One species between the parallels of 0° and 20° N. 
*Freyella echinata, in the Celebes Sea between Celebes and Min- 
danao, and west of the island of Luzon, and extending into the Pacific. 
Paciric: Hight species between the parallels of 40° N. and 45° S. 
*Freyella heroina, in the Mid-North Pacific, near the meridian of 
170° EK. *Freyella pennata, off the coast of Japan, south of Kawatsu. 
“Freyella attenuata, west of the Mariana or Ladrone Islands. *rey- 
