EEVISION OF PALEOZOIC STELLEKOIDEA. 



113 



do I find it at all recognized in the catalogues." These original 

 figures are here reproduced as Promopalseaster, sp. undet. (pi. 14, 

 figs. 1, 2). The specimen is probably an immature individual of 

 P. speciosus. 



Formation and locality. The holotype was found by Mr. J. Kelly 

 O'Neall in the Lower Richmond formation near Lebanon, Ohio, and 

 was loaned to Hall for description. The whereabouts of the specimen 

 can not now be located. Some years ago the writer asked the late 

 Professor Whitfield about it and he answered that Halt had returned 

 it to O'Neall, but the latter in turn wrote (Aug. 27, 1896) that he 

 had not received it. 



Remarks. This species seems to be distinguished by the smaller 

 number of plates in the inframarginal columns, as the following table 

 shows. However, until the nature of the interbrachial areas is known, 

 the relationship of P. granulosus to other Paleozoic forms can not 

 be stated. 



PROMOPAL^ASTER BELLULUS, new species. 

 Plate 15, figs. 6-8; plate 16, fig. 1; plate 18, figs. 4, 5. 



R = 36 mm., r= 10 mm., R = 3.6r. Width of ray at base, 11.5 mm. 



A first view of this species gives the impression of P. speciosus 

 (Meek). Of the latter but a single specimen is known and it is now 

 lost, while of P. bellulus there are numerous examples, all of which 

 have the same specific characters. The specimens preserved in lime- 

 stone have the rays more slender, while those from soft shale are as 

 stout as in P. speciosus. 



In the holotype of P. bellulus from limestone there are 55 adam- 

 bulacral and 38 inframarginal plates in each column, while in 

 P. speciosus there are 43 and 31 plates, respectively, in the same 

 columns. Shale specimens of P. lellulus have less plates in a column. 

 One of these, a somewhat smaller specimen than the holotype, has 

 31 inframarginal plates, the same number as in P. speciosus, and 

 about 48 adambulacrals in each column. P. bellulus has therefore 

 from 31 to 38 inframarginal plates and from 48 to 55 adambulacral 

 plates in each column. 



