206 BULLETIN 



traces of the row of short, flattened, marginal spines seen around the 

 disk of S. fimbriatus, in the form under consideration; nor have 

 the similar little appendages arising in a double row from the am- 

 bulacra of the latter been seen in S. fimbriatus. These, however, 

 may be rather generic than specific characters, and consequently 

 be found common to both species. 



"The specific name is given in honor of Mr. Charles Wachsmuth, 

 of Burlington, Iowa, the discoverer of the only specimen we have 

 seen." 



Formation and locality. Burlington limestone, Burlington, Iowa. 

 The specimen has not been seen; it is in the Museum of Compara- 

 tive Zoology, Harvard University (No. 7). 



SCHCENASTER (?), new species. 



In the Gurley collection of the University of Chicago there is a 

 small specimen (No. 10993) from the Chester formation of Pope 

 County, Illinois. According to the older classification it would be 

 referred to Schwnaster, but until this genus is thoroughly revised 

 nothing of generic value can be done with these Carboniferous 

 asterids. The specimen under discussion seems to be most closely 

 related to S. (?) wachsmuthi. 



Measurements: R = about 10 mm., r = about 3.5 mm. 



SCHCENASTER (?) LEGRANDENSIS Miller and Gurley. 



Plate 32, figs. 4-6. 



Schcenaster legrandensis MILLER and GURLEY, Descr. new gen. and ep. Echinod., 



1890, p. 56, pi. 9, figs. 7-9. MILLER, Sixteenth Rep. Geol. Surv. Indiana, 



1891, p. 371, pi. 9, figs. 7-9; N. Amer. Geol. Pal., App. 1, 1892, p. 682, fig. 1246. 



Original description. "Body thin, regularly pentagonal, sides 

 concave, with long, nanow, gradually tapering convex arms. Plates 

 on the dorsal side of the disk in our specimen apparently anchylosed, 

 and spines, if any belonged to the margin, broken away. Ventral 

 side depressed and flat between the arm furrows, where it consists 

 of very small plates, and if they imbricate inward the overlap must 

 be very slight. Ambulacral furrows wide, deep; two rows of sub- 

 quadrangular, ambulacral plates form the bottom of each furrow, 

 on each side of which there is a row of oblong adambulacral plates, 

 having an obliquely inward imbricating arrangement, presenting 

 somewhat the appearance of a twisted cord; these are continued to 

 the ends of the arms with the same obliquely inward imbricating 

 arrangement. Five pairs of oral plates. 



"This species is small in comparison with the two heretofore 

 described, has sides less convex, and narrower arms." 



Formation and locality. Kinderhook limestone at Le Grand, 

 Iowa. The specimen has not been seen; it may be in the Gurley 

 collection of the University of Chicago. It is certainly not a form 

 of Schcenaster. 



