8 



supports a free arm, which gives to this lateral ray five arms. 

 In the ray opposite the azygous area there are four secondary 

 radials, the last of which is axillary and supports upon each 

 upper sloping side a free arm, which gives to this ray four 

 arms. There are, therefore, twenty-five arms, in this species. 

 The arms are composed of a double series of interlocking 

 plates that are deeper than wide, in the lower part, but flatten 

 out above as they do in Erdmocrinuf, but without the usual 

 increase in width. Pinnules long and dense. 



There are three regular interradials in each area, one large, 

 the other two smaller and somewhat elongated. There are six 

 azygous interradials, the first one heptagonal, in line with the 

 first primary radials, and the largest plate in the calyx. It is 

 followed by three plates, the central one being smaller than 

 the lateral ones; and these by two elongated plates that con- 

 nect with the plates of the vault. The vault is conoidal and 

 larger than the calyx, and bears a long subcentral proboscis. 

 The plates of the vault and proboscis are large and smooth. 



This species will be distinguished by its general form, and 

 twenty-five arms that are flattened toward their terminal ends. 

 This latter character belongs to all species that have been re- 

 ferred to Ereimocrinus. This species and others herein de- 

 scribed show that the flattening of the arms is not of generic 

 importance, though, in a marked degree, it is no doubt of 

 specific value. We have, heretofore, shown that the other 

 characters ascribed to Ereimocrinus are possessed by different 

 species of Batocrinus and that one and all are not of generic 

 value. 



Found in the Keokuk Group, at Boonville, Missouri, and now 

 in the collection of S. A. Miller. The specific name is in honor 

 of F. A. Sampson, the well known naturalist of Sedalia, 

 Missouri. 



BATOCRINUS VETERATOR n. Sp. 



Plate T, Fig. 4, view of calyx and arms opposite the azygous side, 

 a little depressed, and arms broken off at the upper end. 



Species medium size. Calyx obconoidal, two and a half times 

 as wide as high; no radial ridges; plates slightly convex; sutures 

 distinct, somewhat beveled; surface granular; column small. 



