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 

 |)lates that are deeper than wide, in the lower jiart, but flatten 

 out above as they do in Er< imocrinuf, but without the usual 

 increase in width. Pinnules long and dense. 



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

 the oth(3r 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 probo.scis. 

 The plates of the vault and i^roboscis are large and smooth. 



This siiecies 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 Eretmocrinus. 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 d<)uV)t of 

 specific value. We have, heretofore, shown that the oUkm- 

 characters ascribed to Eretmocrinus are posses.sed by difTerent 

 species of Batocrinus and tliat one and all arc not of generic 

 value. 



F()\ni(l ill llic Keokuk- Clroup, at Hoonville. Missouri, and now 

 in the (ujjlection of S. A. Miller. Tlie S2)ecific name is in honor 

 of F. A. Sampson, the well knowTi naturalist of S-dalia, 

 Missouri. 



BATOCRINUS VKTERATOH n. Sp. 



Fhile f, Fif/. 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 lialf limes 

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

 distinct, somewliat beveled; sm-face gi"innlar; cohnnn small. 



