54 BULLETIN 115, UNITED STATES NATIONAL MUSEUM. 



DOLATOCKINUS MAGNIFICUS Miller and Gurley. 



Dolatocrinus magnificus Miller and Gurley, Bull. 4, 111. St. Mus., 1894, p. 1, pi. 

 1, figs. 1-3. 



This was Miller and Gurley's first species of this form, and while 

 its pustulose and wrinkled sculpturing is simulated to some extent 

 in later species, this one may well stand apart on the ground of its 

 size, coarse ornament, and massive form. The type is about 35 mm. 

 high and 65 mm. wide. There are among my material several speci- 

 mens more or less imperfect, all of approximately the same dimen- 

 sions, and there is a very distinct gap in size between these and speci- 

 mens of what is regarded as the next largest species — corporosus. The 

 two forms are quite similar, but magnificus, by reason of some flatten- 

 ing of the interrays, takes on a somewhat pentagonal outline which 

 other species do not possess. Half of these laTge specimens have 18 

 to 21 arms, while 90 per cent of the others have 15 arms or more, and 

 of these, 50 per cent have 20, 21, and 22. The extra arms in these 

 and in the type are clearly abnormal. 



Horizon and locality. — Hamilton (Sellersburg) limestone: Louisville, 

 Kentucky, and vicinity. 



DOLATOCRINUS CORPOROSUS Miller and Gurley. 



Plate 14, figs. 1, 2; plate 16, figs 1, 2. 

 Dolatocrinus corporosus Miller and Gurley, Bull. 6, III. St. Mus., 1895, p. 50, 



pi. 5, figs. 1-3.— Rowley in Greene, 1903, p. 157, pi. 47, figs. 1-3. 

 Dolatocrinus welleri Rowley in Greene, 1903, p. 143, pi. 41, fig. 14. 

 Dolatocrinus corporosus, var. decoratus Rowley, 1903, p. 149, pi. 43, figs. 7-9. 



I have 12 specimens, besides two in the Gurley collection, which 

 may fairly be assigned to this species, with its wide calyx, low tegmen, 

 and coarse wrinkled ornamentation. It is typically a large species, 

 ranging from 25 to 30 mm. height of calyx and 45 to 50 (excep- 

 tionally 75) mm. width, and it is approximately 20-armed. There 

 are specimens with 16, 17, 18, 19, and 20 arms, and also exceptionally 

 one with 10. Omitting the last, and counting the types, 50 per cent 

 of the specimens have full 20 arms. I figure on plate 16 a maximum 

 flattened specimen of this or one of the closelj^ allied species, and also 

 one which is a fine example of the typical bursiform calyx, but is a 

 variant with only 10 arms. 



Horizon and locality. — -Hamilton (Sellersburg) limestone: Charles- 

 town, Indiana, and vicinity. 



DOLATOCRINUS INDIANENSIS Miller and Gurley. 



Plate 14, figs. 3-6. 



Dolatocrinus indianensis Miller and Gurley, Bull. 8, 111. St. Mus., 1896, p. 40, 



pi. 3, figs. 1-3. 

 Dolatocrinus predosus Miller and Gurley, Bull. 9, 1896, p. 40, pi. 2, figs. 27-29. — , 



Rowley in Greene, 1903, p. 152, pi. 45, figs. 1-3, 4-6. 



Both the type specimens to which the above names have been] 

 given are poorly preserved, and do not show the surface characters 



