XXXVI THE VOYAGE OF H.M.S. CHALLENGER. 
Family IL ZoroastErrp 4, Sladen, 1888. 
Cryptozonate Asterids with contingent marginal plates. Disk small; rays long, 
cylindrical, and tapering. Abactinal skeleton tessellate, arranged in regular longitudinal 
and transverse series. Primary apical plates persistent in the adult. Tegumentary 
developments spiniform (long and needle-like). Adambulacral plates unequal, alternate 
plates with prominent ridges. Adambulacral armature complex, polyacanthid. Pedi- 
cellarize (forcipulate) pedunculate. 
Genus 1. Zoroaster, Wyville Thomson. 
Genus 2. Cnemidaster, n. gen. 
Genus 3. Pholidaster, Sladen. 
Family III. StrcHasterip, Perrier, 1885. 
Cryptozonate Asterids with contingent marginal plates. Abactinal skeleton tessellate, 
arranged in more or Jess regular longitudinal series. Tegumentary developments spiniform 
(equal and papilliform or granuliform). Adambulacral ‘plates small, equal, compressed, 
with no ridges. Adambulacral armature simple, diplacanthid. Pedicellarie forcipiform 
and forficiform, ; 
Genus 1. Stichaster, Miiller and Troschel. 
Genus 2. Neomorphaster, n. gen. 
Genus 3. Tarsaster, n. gen. 
Family IV. SouastEerrp&, Perrier, 1884. 
Cryptozonate Asterids with a reticulate abactinal skeleton, more or less irregular, with 
plates bearing paxilliform groups of spines. Actinal intermediate plates more or less 
developed. Armature of the adambulacral plates pectinate, all with a transverse series, 
some with a second series at right angles to this, parallel to the furrow. With inter- 
brachial septa. No supradermal membrane. No pedicellarie. 
Subfamily 1. Sotasrrrin#, Sladen, 1888. 
Solasteridze with the armature of the adambulacral plates in two series at right angles 
to each other. 
Genus 1. Crossaster, Miiller and Troschel. 
Genus 2. Solaster, Forbes. 
Genus 3. Lophaster, Verrill. 
Genus 4. Rhipidaster, n. gen. 
