254 



ECHINODERMA TA. 



[HOL. 



aide is covered by numerous pits and j 

 a thickening of the plates; these pits do 

 not pass through the plates, though they 

 cover a series of plates, sutures and all ; 

 such pits have been found on different 

 species, and it is probable they repre- 

 sent a disease of the test, as they seem 

 to destroy the pores and anchylose the 

 sutures. Collected by J. F. Hammell, 

 of Madison, in Jefferson County, Indiana, 

 cylindricus, Hall, 1861, (Caryocystites 

 cylindricus,) Ann. Rep. Geo. Wis., p. 

 23, and 20th Rep. N. Y. St. Mus. Nat. 

 Hist, p. 354, Niagara Gr. 

 dyeri, S. A. Miller, 1879, Jour. Gin. Soc. 



Nat. Hist., vol. 2, p. 108, Niagara Gr. 

 elegans, 8. A. Miller, 1878, Jour. Gin. Soc. 



Nat. Hist., vol. 1, p. 136, Niagara Gr. 

 faberi, n. sp. Niagara Gr. Body somewhat 

 obo v a te; \ 

 large axial 

 canal passes 

 down into 

 the column; 

 seven plates 

 in the first 

 range ; two 

 small inter- 

 c a 1 a t e d 

 plates on the 

 posterior 

 sidebetween 

 the first and 

 second 

 ranges; 

 seven plates 

 inthe second 

 range; above 

 the second range the plates are polyg- 

 onal, of all sizes, and not disposed in 

 ranges; if they were in ranges there 

 would be about seven below the sum- 

 mit ; ambulacral orifice on the posterior 

 side of the summit, elliptical, sur- 

 rounded by six plates, four of which 

 are protuberant or swollen at the orifice, 

 but no arms ever attached, nor are there 

 cicatrices for spines ; mouth pentagonal, 

 on the anterior side of the summit, sep- 

 arated from the ambulacral orifice by 

 two plates, one of 

 which bears the anal 

 orifice; on the pos- 

 terior side, below the 

 summit, there are 

 three circular pits, 

 which do not seem 

 to have been of any 

 economical use ; en- 

 tire surface porifer- FIG. 335. Holocys- 

 ous in pairs, which tltes faberi - 

 open through small tubercles. Col- 

 lected by Charles Faber, of Cincinnati, 

 (in whose honor I have given the 

 specific name,) in Jefferson County, 

 Indiana. 



globosus, S. A. Miller, 1878, Jour. Gin. 

 Soc. Nat. Hist., vol. 1, p. 133, Ni- 

 agara Gr. 



G. 334. Holocystltes faberi. 



hammelli n. sp. Niagara Gr. Body sub- 



globose, flattened on the anterior side ; 



sessile, no perforation for a column ; 



basals seven ; between the first and 



second se- 



ries there 



are five 



plates in- 



serted on 



the poste- 



rior side ; 



ten plates 



in the sec- 



ond series ; 



ten in the 



third ; nine 



in the 



fourth, and 



nine in 



t h e fifth, 



which s e - 



ries reaches 



the mouth; above these there are eight 



plates in the series which bore the am- 



bulacral spines, and some smaller plates 



surrounding the ambulacral orifice on 



the summit; four cicatrices for ambu- 



lacral spines; mouth at the margin of 

 the sum- 

 mit ; anal 

 opening in 

 the plate 

 adjoining 

 the mouth 

 and be- 

 tween it 

 and the 

 ambula- 

 cral orifice; 

 all th e 

 plates po- 

 riferous in 



FIG. 336 . Holocystites ham- 

 mellli. Anterior side. 



FIG. 337. Holocystit.es ham- 

 melli. Summit view ; mouth 

 on the lower side. 



pars ; o n 

 the ante- 

 rior side below the mouth there is one 

 plate in the third series, and one in the 

 fourth series, each bearing a prominent 

 tubercle, with a circle of pores passing 

 through it, giving it a radiate appear- 

 ance on top ; this character may not be of 

 specific importance, but the tubercles are 

 different from those observed on other 

 specimens. Collected by J. F. Hammell, 

 in Jefferson County, Indiana, in whose 

 honor I have given the specific name. 



jolietensis, S. A. Miller, 1882, Jour. Cin. 

 Soc. Nat. Hist., vol. 5, p. 223, Niagara Gr. 



ornatus, S. A. Miller, 1878, Jour. Cin. 

 Soc. Nat. Hist., vol. 1, p. 132, Niagara Gr. 



ovatus, Hall, 1864, 20th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 357, Niagara Gr. 



perlongus, S. A. Miller, 1878, Jour. Cin. 

 Soc. Nat. Hist., vol. 1, p. 132, Niagara Gr. 



plenus, S. A. Miller, 1878, Jour. Cin. Soc. 

 Nat. Hist, vol. 1, p. 135, Niagara Gr. 



pustulosus, S. A. Miller, 1878, Jour. Cin. 

 Soc. Nat. Hist, vol. 1, p. 134, Niagara Gr. 



rotundus, S. A. Miller, 1879, Jour. Cin. 

 Soc. Nat. Hist., vol. 2, p. 107, Niagara Gr. 



