THE VOYAGE OF H.M.S. CHALLENGER. 
The five or six additional species dredged by the “Blake,” “Tra- 
vailleur,” and “Talisman” Expeditions, which were mentioned above 
as probably belonging to this genus, are all from the North-Atlantic 
area. 
Pactric: One species between the parallels of 10° N. and 10° 8. 
Nymphaster bipunctus, north of Admiralty Island. 
EASTERN ARCHIPELAGO: One species between the parallels of 20° N. and 20° 8. 
Nymphaster symbolicus, off the Philippine Islands, and in the Ara- 
fura Sea. Nymphaster symbolicus, var. breviradiata, in the Banda Sea. 
8. Bathymetrical range: 28 to 1525 fathoms. 
Two species, viz., Nymphaster bipunctus and Nymphaster symbolicus, are 
found in the Littoral zone; and two species, viz., Nymphaster basilicus and 
Nymphaster protentus, are confined to the Abyssal zone. 
Greatest range of one species: Nymphaster symbolicus, 28 to 115 fathoms. 
If the additional North-Atlantic species, which I suppose to belong to this 
genus, be taken into consideration, the greatest range and greatest depth is 
attained by the species described as Pentagonaster alexandri, Perrier, which, 
according to Perrier, extends from 84 to 1930 fathoms. (I have already ex- 
pressed my doubt as to the original generic reference of this form, under the 
head of the chorology of the genus Pentagonaster.) The form described as 
Dorigona arenata, Perrier, extends from 164 to 893 fathoms. 
y. Nature of the Sea-bottom: Each of the species dredged by the Challenger was 
found inhabiting ground of a different nature. The two deep-water forms, 
Nymphaster basilicus and Nymphaster protentus, were on Red mud and Hard 
eround respectively. Nymphaster bipunctus occurred on Coral mud, and 
Nymphaster symbolicus on Green mud, the variety of the latter—Nymphaster 
symbolicus var. breviradiata—living on Blue mud. 
Chorological Synopsis of the Species. 
Ocean. Range in Fathoms. Nature of the Sea-bottom. 
Nymphaster albidus . Atlantic. wee vee 
Nymphaster basilicus . Atlantic. 1200 Red mud. 
Nymphaster bipunctus Pacific. 150 Coral mud. 
Nymphaster protentus . | Atlantic. 1525 Hard ground. 
Nymphaster symbolicus K Eastern Archipelago. 28 to 115 Green mud. 
7 t e , _ 
giyaehae pigeons ner \ Eastern Archipelago. 140 Blue mud. 
