8 



the tertiary radials. The last plate mentioned is in part a 

 plate belonging to the calyx, but its superior faces are higher 

 than the ambulacral furrous and unite with plates belonging to 

 the vault. The vault is unknown. 



This is a peculiar species that will, at once, be distinguish- 

 ed, by the spinous plates, nineteen arms, and numerous inter - 

 radials. 



Found by C. S. Hodgson in the Burlington Group, in Adams 

 county, Illinois, and now in the collection of S. A. Miller. 



BATOCRINUS SALEMENSIS, n. sp. 



Plate I y Fig. 10, basal view; Fig. 11, summit; Fig. 12, azygous side. 



Species small, vault and calyx subequal, depressed, bitur- 

 binate. Calyx saucer- shaped, between two and three times as 

 wide as high. Plates convex, radial series somewhat angular. 

 Ambulacral openings directed horizontally. 



Basal plates form an hexagonal disc one-half wider than the 

 diameter of the column and having a height equal to about 

 one-fourth the diameter of the column. The depression for the 

 attachment of the column is hemispherical. The first primary 

 radials are between two and three times as wide as long, three 

 hexagonal, two heptagonal. Second primary radials quad- 

 rangular, short, from three to five times as wide as long. 

 Third primary radials only a little larger than the second, 

 from three to four times as wide as long, pentagonal, axillary, 

 and, in tour of the rays, bear upon each upper sloping side 

 two secondary radials the last ones of which are axillary and 

 bear upon each upper sloping side two tertiary, which gives 

 to each of these rays four arms. In the ray opposite the 

 azygous area, the third primary radial bears upon each upper 

 sloping side three secondary radials, which gives to it two 

 arms. There are, therefore, eighteen arms, in this species, 

 and eighteen ambulacral openings to the vault. 



In each of two of the regular intcrradial areas there are 

 three plates, one large followed by two small plates. In each 

 of the other two areas there are only two plates, one large 

 plate followed by one plate in the second range In the 

 azygous area there are six plates. The first one is in line 



