33 



that have been called Eretmocrinus, A few ovarian apertures 

 may be distinguished, but they are very minute, and, adjoin- 

 ing some of the arms, there seems to be none at all; in fact, 

 there are only two, one on each side of the azygous depres- 

 sion, that can be clearly distinguished. 



This species will be distinguished, by its general form, con- 

 nection of the interradial area with the vault, and by the 

 seventeen ambulacral openings. The entire absence of a pro- 

 boscis or the existence of a very short one is a feature also of 

 some importance. 



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

 Missouri, and now in his collection. 



BATOCRINUS PROCERUS, n. sp. 



Plate I, Fig. 40, basal view; Fig. 41, azygous side view; Fig. 42, 

 opposite view of same specimen. 



Species medium size and capacity of the vault exceeding 

 that of the calyx and belonging to those forms which are re- 

 ferred by authors to Eretmocrinus. Calyx broadly truncated 

 below and obconoidal above, for a short distance, but becom- 

 ing obpyramidal, in the region of the arms, by reason of a 

 slight tendency toward lobes, in the radial series. No radial 

 ridges. Width about one-half more than height. Plates mod- 

 " erately convex. Column round — not large. 



Basals form an hexagonal disc more than one-half wider 

 than the diameter of the column, with a concave, radiately 

 lined depression below, for the columnar attachment. First 

 primary radials wider than high. Second primary radials 

 quadrangular, from two to three times as wide as high. 

 Third primary radials about one-half larger than the second, 

 more than twice as wide as long, pentagonal, axillary, and, in 

 each series, except the one opposite the azygous area, bear 

 upon each upper sloping side two secondary radials, the last 

 one of which is axillary and supports upon each superior 

 sloping side a single tertiary radial, which gives to eaich of 

 these four rays four arms. In the ray opposite the azygous 

 area there are, upon one of the superior sloping sides of the 

 third primary radial, three secondary radials and upon the 

 other two secondary radials, the last of which is axillary and 

 —5 



