INVERTEBRATES. 83 



PAL.EOCRINOIDEA. Wachs, and Spr, 



GENUS BATOCRINUS, Casseday. 

 BATOORINUS MONTGOMERYENSIS. (sp. nov.) 



PL XII, Figs. 2-2a. 



Batocrinus montgomeryensis, Worthen, March. 1884. Bui etin No. 2 of the Illinois State 

 Museum of Natural History, page 25. 



Body below the arms spreading into a saucer-like form, more 

 than twice as wide as high, and composed of slightly convex 

 granulose plates. Dome inflated, nearly twice as long as the 

 body below,, and composed of nearly flat plates, each of which 

 has a small obtusely pointed node in the center. Ventral tube 

 central and apparently rather slender. 



Basals short and forming a projecting rim around the colum- 

 nar facet. First radial series 3X5; the first one hexagonal or 

 heptagonal, nearly twice as wide as long. The second is quad- 

 rangular, about the same length as the first, and two-thirds as 

 wide; the third wider than long, axillary, and supporting the 

 first of the secondary series. The anterior ray has three second- 

 ary radials in each division. In the postero-lateral rays, the 

 secondary radial series consists of five plates, three on one side 

 and two on the other, the second plate on one side being an 

 axillary plate which supports on each side the tertiary radials. 



The antero-lateral rays have two series of secondary radials, 

 consisting of two plates each, the upper one of which is axillary, 

 and supports a double series of tertiary radials. 



This gives an arm formula of two arms to the anterior ray, 

 three each to the postero-lateral rays, and four each to the 

 antero-laterals. 



First anal plate as wide as long, heptagonal, supporting three 

 plates above in the first series, five in the second, and three in 

 the third, the middle one of the last series projecting about one- 

 half its length above the others. 



