KEPORT ON THE ASTEROIDEA. xxxv 



intermediate plates, and their axes are usually not in parallel planes. Papulae not confined 

 to the area circumscribed by the supero-marginal plates, but often present between the 

 marginal plates and on the actinal surface. Ambulacral plates more or less crowded and 

 narrow, the development of the ambulacral skeleton being frequently greatly accelerated in 

 relation to that of the test generally. Actinostomial ring with ambulacral or adam- 

 bulacral plates prominent. Pedicellariaa pedunculate or sessile, not foraminate (except 

 in the Linckiidae). 



Family I. LiNCKHDiE, Perrier, 1875, emend. 



Cryptozonate Asterids with comparatively well- developed marginal plates, always con- 

 tingent. Disk small, rays long and cylindrical. Abactinal skeleton tessellate. Tegumen- 

 tary developments granulate. Superambulacral plates usually present (wanting in Fromia 

 and Ferdina). Pedicellariae (rarely present) excavate or foraminate. 



Subfamily 1. Ch^etasterisle, Sladen, 1888. 



Linckiidaj with abactinal plates with internal supplementary plates. Abactinal plates 



with paxilliform tabula. 



Genus 1. Chtetaster, Midler and Troschel. 



Subfamily 2. Linckun^e, Sladen, 1888. 



Linckiida3 with abactinal plates devoid of internal supplementary plates ; not forming 

 paxilliform tabula. Abactinal and marginal plates granulose, and not bearing spines. 



Genus 1. Fromia, Gray. 

 Genus 2. Ferdina, Gray. 

 Genus 3. Ophidiaster, Agassiz. 

 Genus 4. Pharia, Gray. 

 Genus 5. Leiaster, Peters. 

 Genus 6. Linckia, Gray. 

 Genus 7. Phataria, Gray. 

 Genus 8. Nardoa, Gray, emend. 

 Genus 9. Narcissia, Gray. 



Subfamily 3. Metrodirik<e, Sladen, 1888. 



Linckiidae with abactinal plates devoid of internal supplementary plates ; not forming 

 paxilliform tabula. Abactinal and marginal plates covered with membrane, the former 

 and occasionally the latter bearing isolated and skin-covered spinelets. 



Genus 1. Metrodira, Gray. 



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

 p. 397. 



