160 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. 



HELIANTHASTER FILICIFORMIS Woodward. 



Helianthaster filiciformis WOODWARD, Geol. Mag., dec. 2, vol. 1, 1874, pp. 7-10, 

 fig. on p. 8. 



A natural mold in sandstone measuring about 45 mm. in total 

 diameter. Has 11 rays. The disk "must have measured 10 

 mm. in breadth. The arms are 17 mm. in length, and near their 

 junction with the body are 5 mm. broad. " The specimen needs to 

 be restudied and modernized. 



The holotype is from the Upper Devonic at Great Inglebourne, 

 Harberton, South Devon, England, and is now in the collection of 

 Mr. Champ ernowne. 



LEPBDASTERELL.A, new genus. 



Plate 25, fig. 2. 

 Lepidasterella SCHUCHERT, Fossilium Catalogus, Animalia, pt. 3, April, 1914, p. 23. 



Much like Lepidaster, but with 24 rays instead of 13 as in that 

 genus. Rays extending considerably beyond the disk. The abac- 

 tinal side only is known, but it shows that the rays have slender radial 

 columns, the ossicles of which are disposed alternatingly with the 

 larger and more prominent supramarginals. Outside of these in 

 some rays may be seen the edges of the inframarginalia, and these 

 have well developed but slender, rather long spines. 



There appear to be no ambital areas, as the inframarginals of 

 adjoining rays meet and at their junction begins the disk. The 

 disk appears to have been made up of more or less closely adjoining 

 polygonal plates whose arrangement is not discernible in the specimen. 



The madreporite and its position are unknown. 



Actinal area unknown. 



Genoholotype and only species. L. babcocki, new species. 



Remarks. The essential difference between Lepidaster and Lepid- 

 asterella is that the former has 13 rays while the latter has 24. 



LEPIDASTERELLA BABCOCKI, new species. 



Plate 25, fig. 2. 



Helianthaster, new species CLARKE, Fifty-ninth Rep. N. Y. State Mus., 1906, p. 37, 



and plate. 

 Helianthaster gyalum CLARKE (part), Bull. N. Y. State Mus., No. 121, 1908, p. 61 



(not pis. 12, I3=Pal3eosolaster (?) gyalum}. 



Description. Rays, 24. Length of best preserved ray in the 

 holotype, 28 mm. Width of ray at base, 3 mm. Width of disk, 

 probably not less than 20 mm. 



Rays slender and regularly tapering. Their structure is only 

 known abactinally, from a natural mold in a fine sandstone. Medi- 

 ally there is a narrow but high column of radial plates, each one of 



