REVISION OF PALEOZOIC STELLEROIDEA. 157 



PSEUDOPALASTERINA FOLLMANNI (Sttirtz). 



Palasterina follmanni STURTZ, Paleeontographica, vol. 36, 1890, p. 226, pi. 29, 



figs. 29-31a. 

 Pseudopalasterina follmanni STURTZ, Verb, naturh. Ver. preuss. Rheinl., etc.. 



vol. 56, 1900, pp. 219, 224. 



Actinally this species has ambulacrals and narrow adambulacrals 

 and outside of the latter the interbrachial and abactinal areas consist 

 of a membrane with small spine-bearing plates. It has no inframar- 

 ginal nor radial and supramarginal columns, features characterizing 

 Palasterina. 



Formation and locality. Lower Devonic of Bundenbach, Germany. 



NEW GENUS. 



NEW SPECIES. 



Prof. Weller got on Fountain Creek, at Waterloo, Illinois, in the 

 St. Louis limestone, a small pentagonal asterid (No. 14396, Univer- 

 sity of Chicago collection) showing only the actinal side, that differs 

 from all other known forms of the large-disked genera. The five rays 

 are completely within the pentagon, with the interbrachial areas large 

 and straight-sided. These areas are made up of a few large tesselate 

 plates, of which it seems that seven compose the interbrachial mar- 

 gins and inside these there seem to be transverse rows, each with five, 

 three, two, and one ossicles. It could not be made out whether the 

 inframarginals and supramarginals are directly superposed, but this 

 may be so. 



Ambulacral furrows exceedingly narrow, a mere line. These are 

 bounded by columns of large, very ornate adambulacrals, each with 

 seven ossicles. Those of opposite columns alternate decidedly with 

 one another and on its outer side each bears two short but dis- 

 tinct spines. 



Adambulacral oral armature in five very prominent pairs of pieces, 

 long and pointed, and about twice as long as any other adambulacrals. 



Measurements: R = 8.5 mm., r = 7 mm. 



Family LEPIDASTERIME Gregory (emend.). 



Lepidasteridse GREGORY (part), Geol. Mag., dec. 4, vol. 6, 1899, p. 352 (includes 

 Lepidaster&n&Etheridgaster)', Treat. Zool., vol. 3, Echinoderma, 1900, p. 255. 



Helutnihasterinse GREGORY, Geol. Mag., dec. 4, vol. 6, 1899, p. 258. 



Helianihasteridse STURTZ, Verh. naturh. Ver. preuss. Rheinl., etc., vol. 56, 1900, 

 p. 204. SCHONDORF, Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 63, 

 1910, p. 235. 



Primitive multi-rayed Phanerozonia apparently with the general 

 structure of Pabeasteridse, but with as many as 24 rays. Madreporite 

 known only in Helianthaster, where it is interbrachial and on the 



