344 Dr. J. W. Gregory — On Palceozoic Starfishes. 



regarding the type species of the genus, that Forbes " would have 

 referred it, and with it the whole group, to their true position near 

 Asteriscus (Falmipes)." Since that date the species has always 

 been included in Palceasterina, as by Lindstrom, who in 1888 

 published a synonymy of the species. 



It is, however, quite clear that the species belongs to a genus 

 distinct from Palceasterina. I therefore propose to call it Zind- 

 stromaster, as it comes from the beds which will always be associated 

 with Professor Lindstrom's name. The word is open to criticism as 

 being a mongrel composed of Swedish and Greek. But so long as 

 such terms as glaciology are in current scientific use, and so long 

 as we give animals such names as Nautilus imperialis — a mixture of 

 good Greek and bad Latin — other convenient mongrel terms may be 

 tolerated. And Lindstromaster is certainly convenient. It not only 

 shows at once that the animal is a starfish, but by reference to the 

 name of the distinguished authority on the Swedish Silurian fauna 

 suggests the age and country in which the genus lived. The name 

 has many precedents, as, for instance, Salteraster, which is as hybrid 

 etymologically and as instructive palgeontologically. 



To illustrate the affinities of Lindstromaster and simplify its 

 description it will be advisable to include diagnoses of the Fedse- 

 asteridee and Pala3asterinida3. The present opportunity is also taken 

 for the description of two new species and the institution of three 

 other new genera. 



Class STELLEEOIDEA. 

 Subclass ASTEEOIDEA. 



Order 1. PHANEROZONIA. 



Family 1. PALJ^ASTEEID^. 

 Diagnosis. 



Phanerozonia with the ambulacral ossicles all or mostly alternate 

 in position. The madreporite is abactinal, and the oral armature 

 adambulacral. The skeleton of the abactinal surface and inter- 

 radial areas is tessellate. Marginal plates large. 



Subfamily 1. PALiEASTEEIN^. 

 Diagnosis. 



Palseasteridee with the ambulacral ossicles definitely alternate. 

 The rays are usually long and sharply marked off from the disc, 

 which is always small, with small interradial areas. 



1. PAL^ASTER, Hall, 1852. 

 Pal. New York, vol. ii, p. 247 {non Salter, Trautschold, De Koniuck, etc.). 



Type SrEciES. — P. Niagarensis, Hall, 1862. Op. cit., p. 247, 

 pi. li, figs. 21-23, Silurian — Niagara Series : Lockport, New York. 



Pal^aster caractaci, Salter MS. 

 Diagnosis. 



A small species with JS : r as 12 : 3^. The arms are therefore 

 long. They taper gradually. The iufra-uiarginal plates number 



