KErORT ON THE ASTEROIDEA. xxix 



Subfamily 3. Pseudarchasterix.e, Slaclen, 1886. 



Archasteridse with a definite medio-radial line of abactinal plates. Abactinal plates 

 arranged in longitudinal series parallel to the median series. Actiual intermediate plates 

 well developed. Abactinal plates devoid of internal imbricating ridges. No pedi- 

 cellariiE. 



Genus 1. Pseudarchastcr, Sladen. 



Genus 2. Aphroditaster, Sladen. 



Subfamily 4. Archasterin^e, Sladen, 18S6. 



Archasteridse with a definite medio-radial line of abactinal plates. Abactinal plates 

 in oblique transverse rows on each side of the median series. Abactinal plates with 

 special internal imbricating ridges. Actinal intermediate plates aborted, or very few in 

 number. Pedicellariae present. 



Genus 1. Archaster (Miiller and Troschel), emend. Sladen. 



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

 see p. 2. 



Archasterid^; incertse sedis. 



The following recently described genera appear to me to belong to the family Archas- 

 terinse, but the descriptions published do not enable me to indicate their position more 

 definitely, and in some cases the reference to the family is doubtful. 



Genus Benthopecten, Verrill. 

 Genus Blahiaster, Perrier. 

 Genus Cheiraster, Studer. 

 Genus Crenaster, Perrier. 

 Genus Goniopecten, Perrier. 

 Genus Pectinaster, Perrier. 

 Genus Luidiaster, Studer. 

 ? Genus Odontaster, Verrill. 



Remarks. — Judging from the description alone, I have great hesitation in placing 

 Odontaster with the Archasteridse ; it may possibly prove to be more closely allied to the 

 Pentagonasteridse : in any case it appears to be an annectant genus between the two 

 groups. 



Family II. Porcellanasterid.-e, Sladen (1883), emend. 1886. 



Phanerozonate Asterids with thin and lamelliform marginal plates, naked or covered 

 only with membrane. Abactinal area covered with membrane, beset with simple spini- 



