cxlii 
THE VOYAGE OF H.M.S. CHALLENGER. 
Genus 1. Am/phius, n. gen. 
Epipolasidse possessing but one form of microsclere, an ampbiaster. Chamber- 
system diplodal. 
Type — Amphius huxleyi, n. sp. (p. 178). 
Genus 2. Asteropus, n. gen. 
Epipolasidse resembling Stryphnus, from which they differ mainly by the absence of a 
trisene. Chamber-system (?). 
Type — Asteropus simplex (Carter), p. 205. 
Genus 3. Coppatias, n. gen. 
Epipolasidse in which the single form of microsclere is a euaster. Chamber- 
system (?). , 
Type — Coppatias coriaceus (Carter), p. 207. 
The position of this family is altogether doubtful; the genus Amphius certainly 
presents great resemblance to the Stellettidse so far as its soft tissues are concerned, and 
the chamber-system might with almost as much justice be termed aphodal as diplodal ; 
of the soft parts of the other two genera nothing is known ; Asteropus in the character 
and arrangement of its spicules, at least in Asteropus simplex, so closely resembles Algol 
corticata, with which it was associated by Carter in the genus Stellettinopsis, that I am 
strongly of opinion some close phylogenetic connection exists between the two, and 
indeed that Asteropus has resulted from an Algol by the loss of triaenes. Of Coppatias I 
am not in a position to speak, as I have seen no specimens of it, but I am inclined to think 
that its place will eventually be found to lie somewhere within the Spintharophorous 
division of the Monaxonids. 
Demus III. Stereasteosa, Sollas. 
Sterradrosa, Sollas, Encyclopsedia Britannica, vol. xxii. p. 423, 1887. 
Astrophora in which the characteristic microsclere is a sterraster. 
