xxxiv THE- VOYAGE OF H.M.S. CHALLENGER. 



lamelliform plates, notched on one side and bearing spines on the free margin : or 

 irregular rounded plates with tufts of spinelets. Actinal interradial areas with imbri- 

 cating plates bearing spines. No pedicellariee. 



Subfamily 1. Ganeriin^e, Sladen, 1888. 

 Asterinidse with large marginal plates, and superficially phanerozonoid in character. 



Genus 1. Cycethra, Bell. 

 Genus 2. Ganeria, Gray, 



Subfamily 2. Asterinin t .e, Sladen, 1888. 



Asterinidee with marginal plates equal to or smaller than the other plate3. Papula? 



distributed throughout the abactinal area. Abactinal plates thick, crescentiform, devoid 



of internal processes. 



Genus 1. Patiria (Gray), emend. Perrier. 



Genus 2. Nepanthia, Gray. • 



Genus 3. Asterina, Nardo. 



Genus 4. Disasterina, Perrier. 



Subfamily 3. Palmipedin^e, Sladen, 1888. 



Asterinidse with the papulae confined to the radial regions. Abactinal plates in 

 the median regions stellate. Abactinal plates thin, scale-like, with elongate internal 

 prolongations. 



Genus 1. Palmipes, Linck. 



Genus 2. Stegnaster, n. gen. 



For a Synopsis of the Subfamilies and Genera included in the Family Asterinidse, see 

 p. 375. 



Asterinidse incertse sedis. 

 Genus Tremaster, Verrill. 



The description given of this genus is not sufficient to indicate whether it should be 

 placed amongst the Asterininae or the Palmipedinee. It is even possible that its abnormal 

 structure may require the establishment of an independent subfamily which should be 

 called Trernasterinae. 



Order II. CEYPTOZONIA, Sladen, 1888. 



[Adetopneusia : Leptostroteria.] 



Euasteroidea with marginal plates inconspicuous and more or less rudimentary in the 

 adult. The supero-marginal plates often separated from the infero-marginal plates by 



