242 The Ohio Journal of Science [Vol. XVII, No. 7, 



river. Here it contains: Cladopora sp., Haly sites lahyrinthicus , 

 Favosites niagarensis, Favosites spinigenis, Spirorbis sp., 

 A nastrophia inter nascens, A try pa reticularis-niagarensis, a strongly 

 convex form of DalmaneUa elegantula, Leptcena rhomboidalis, 

 Pentamerus compressa, Platystrophia biforata, Spirifer cf. radi- 

 atiis, Uncinulus stricklandi, Calymene celebra, and the Bumastus 

 of northern Indiana described by Kindle under Illcenus insignis. 

 Pentamerus compressiis, Kindle and Berger, is a very dif- 

 ferent species from Pentamerus cylindricus , Hall, and belongs to 

 a much higher horizon. Pentamerus cylindricus occurs about 

 50 feet above the base of the Louisville limestone in the area 

 northeast of Louisville, along the Ohio River. It is unknown 

 in northern Indiana, where the form identified as Pentamerus 

 oblongus cylindricus is only a variation of Pentamerus compressiis. 

 Pentamerus compressiis was described from the Noblesville 

 dolomite at Delphi, Indiana, and it is to this horizon that the 

 upper part of the exposures at Muncie are referred. 



Habrocrinus sp. Plate X, Fig. G. 



Basals three; in the cast they diverge strongly producing a lateral 

 outline of about 110 degrees for the base of the calyx. The five radials 

 and the first plate of the anal series are closely similar in size and shape, 

 differing only in the fact that those plates which are directly above 

 the basals are hexagonal in outline, while the intermediate plates are 

 heptagonal. Costals, two, slighth^ smaller than the radials; the first, 

 hexagonal; the second, heptagonal, supporting a pair of distichals, 

 followed by a second pair. The latter arc sejiaratcd by at least one 

 inter-distichal plate. Apparently no palmers enter into the formation 

 of the dorsal cup ; for this reason the specimen here described is referred 

 to Habrocrinus. 



The first plate of the anal interradial area is followed b}^ three 

 plates, of which the middle one is hexagonal, and the two lateral ones 

 are pentagonal in outline, in each case with a horizontal suture-line at 

 the top. These are followed by a second set of three plates, of which 

 the two lateral plates are hexagonal, and the middle plate is irregularly 

 octagonal in outline. The two .sets of three plates just described 

 are subequal in size, and are only moderately smaller than the adjacent 

 costals. The two lateral plates of the second set are each followed 

 by a plate irregularly hexagonal in form, which is only moderately 

 smaller than the plate upon which it rests. The middle, irregularly 

 octagonal plate of the second set, however, is followed by three much 

 smaller plates of which the middle one is hexagonal, and the two lateral 

 ones are pentagonal in shape, one of the angles of the latter being 

 directed upward. These three smaller plates arc followed by a trans- 

 verse series of five plates, also of distinctly smaller size, and the latter 

 by other plates whose arrangement can not be determined from the 

 specimen at hand. 



