132 Cincinnati Society of Natural History. 



the specimen illustrated. It has a lengtli oi'oiie fourth of an inch, and 

 tapers to an obtuse point. There are twenty-five distinct annulations 

 shown upon it. The magnitied view is intended to show these annula- 

 tions. The column was evidently small. 



Length of specimen one and six tenths inches; lengtli of four ranges 

 of plates on the anterior side, one and one tenth inches; breadth of 

 same plates, eight tenths of an inch; greatest circumference, four 

 inches; greatest diameter, one and four tenths inches. 



Collected hy Prof A. G. Wetherby, in whose honor the species is 

 named, in the lower part of the Niagara Group, in Riple_y County, 

 Indiana. 



HoLoCYSTiTES ORNATUS, n. sp. (Plate v., figs, 3, 3a, 3/>.) 



Body somewhat obovate, depressed on the anterior side. There are 

 eight hexagonal plates in the first range; four of these on the anterior 

 side are twice as long as wide; the others are nearly as wide as long. 

 These plates are very much constricted, which indicates that the body 

 was possessed of a small column. The fossil rapidly enlarges at the 

 second range, which consists of eight plates, varying in form from 

 pentagonal to heptagonal. The plates do not seem to be disposed in 

 any determinable order above the second range, though if arranged in 

 courses, there would be about ten between the column and the arm 

 plates; neither have they any regularit}' in form or size. The ambu- 

 lacral orifice is situated upon the summit, near the posterior margin; it 

 is somemhat elongated, surrounded by seven plates, and four (possibly 

 five) arm bases. The mouth is situated upon the summit, two plates 

 distant from the ambulacral orifice; part of it is broken away in our 

 specimen, but it seems to have been surrounded by five plates. A 

 small anal opening exists in the top of a pustule between the ambula- 

 cral orifice and the mouth. The pustule is situated on the right side 

 of the plate, adjoining the mouth and close to an arm base, being nearly 

 in the centre of the summit. 



The surface is very strongly granulose, or pustulose, and each plate 

 is perforated by numerous pores. The pores open upon the summit of 

 the granules, and where the granules are worn off", the plates show the 

 pores, in pairs, passing tlirough to the interior. 



Length of specimen, one and five eighths inches; greatest diameter, 

 a little over an inch. 



Collected by Frederick Braun, Esq., in the lower part of the Niagara 

 Group, in Jefferson County, Indiana, 



HoLoCYSTiTES PEKLONGUS, n. sp. (Plate v., figs. 4, 4rt.) 



[VAy.—perloimus, very long.l 



Body very long, sub-cylindrical, and very gradually enlarging from 



