Remarks on Some Fossils of the Cincinnati Group. 19 



bifurcating plate resting on the radial below and supporting above 

 on its right sloping side the true brachial series of the arm, and on 

 the left a row of quadrangular plates, vertically arranged. This 

 series of plates resemble the brachial plates, except that they are 

 more elongate. They undoubtedly formed the posterian side of 

 an anal tube, corresponding in this respect to the same series of 

 plates in the genus locrinits. Arms bifurcating frequently, gradu- 

 ally tapering. Pinnulae unknown. 



"The arrangement of the plates forming the calyx is similar to 

 that in Dendrocrinus, except that the regularity of the radial series 

 of plates is not broken by the interposition of the anal plates. In 

 this respect Merocriniis is allied to locri/iiis, and also in the position 

 of the plates supporting the anal tube. It differs from locrimis in 

 having a well-developed ring of underbasals, and also in the gen- 

 eral appearance of the entire body." 



Merocrinus CURTIS, (Ulrich.) Faber. 



Plate I. Figure 2. • 



Body short, broad, increasing very little in width to the base 

 of the arms. Underbasals very short, more than twice as wide as 

 high. Basals rather obscurely hexagonal, with a width equal to 

 one and a half times the length. Radials a little larger than the 

 basals, a little wider than high, and pentagonal. The first right 

 postero-lateral plate above the radial is pentagonal, and supports 

 the brachial plates on its right slojnng side, and on the left the 

 posterior plates of the anal tube. The brachial plates are quad- 

 rangular and twice as wide as high. The first bifurcation of the 

 postero lateral ray occurs on the sixth plate above the bifurcating 

 plate below, and the other rays bifurcate on the sixth plate above 

 the radial ring of plates. One of these rays supports three arms at 

 this bifurcation, but this is undoubtedly abnormal. The posterior 

 plates of the anal tube are a little longer than wide, and about one 

 half as wide as the brachials, and are very convex on the outer- 

 side, and rise from the left sloping side of the second radial. 



Column round, composed of thin joints, nearly smooth, in- 

 creasing in size downward. 



So far, this is the only specimen found besides the one of Mr. 

 Ulrich. Its rarity is well known to local collectors. 



Collected by the Author in the lower part of the Cincinnati 

 Group, about forty feet above low water mark at Ludlow, Ky. 



