80 



specimens of this species possessing three secondary radials, 

 we would not hesitate to regard it as a normal feature, but 

 having only one, it may be a Gtrange freak that was not per- 

 petuated. 



Found by S. A. Miller in the Keokuk Group, at Boonville, 

 Missouri, and now in his collection. 



BATOCRINUS MODESTUS, n. Sp. 



« 



Plate I, Fig. 34, basal view; Fig, 35, azygous side view; Fig. 



36, summit view. < > 



Species medium or just below medium size. Calyx subhemi- 

 spherical, rather more than twice as wide as high, and broadly 

 rounded below. Plates convex. No radial ridges. Surface 

 granular. Column round, medium size. ! 



Basals form an hexagonal disc that projects slightly below 

 the first primary radials and has a diameter a little less than 

 twice the diameter of the column; it bears a moderately con- 

 cave, radiately lined depression for the columnar attachment. 

 First primary radials about one -half wider than high, threes 

 hexagonal, two heptagonal. Second primany radials quadrangu- 

 lar, three or four times as wide as long. Third primary radials 

 only a little longer than the second, and two or three times as 

 wide as long, pentagonal, axillary, and in one lateral ray sup- 

 ports upon each upper sloping side two secondary radials, the 

 last one of which is axillary and supports upon each upper 

 sloping side two tertiary radials, which gives to this ray four 

 arms. In the other lateral ray there are four secondary radials 

 upon one side of the third primary radial and two upon the other 

 followed by three tertiary radials upon each side, which gives 

 to this ray three arms. Upon the distal side of the third 

 primary radials adjoining the azygous area there are four second- 

 ary radials and on the proximal side two, the last being axil- 

 lary and bearing upon each upper sloping side two or three 

 tertiary radials which gives to each of these rays three arms. 

 In the ray opposite the azygous area there are three secondary 

 radials on each upper sloping side which gives to this ray two 

 arms. There are, therefore, fifteen arm openings to the vault, 

 in this species, but all the arms preserved in any of our 

 specimens at once bifurcate, giving, as indicated, thirty free 



