254 



ECHINODERMA TA. 



[hol. 



side is covered by numerous pits and 

 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 Beem 

 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. Cin. Soc. 



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

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



Nat. Hist., vol. 1, p. 136, Niagara (Jr. 

 faberi, n. sp. Niagara Gr. Body somewhat 



obo v a te; 

 large axial 

 canal passes 

 down into 

 the column; 

 M'ven 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 

 Fig. 884.-Holocystltes faberi. ran ge; 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- Fi«. 385.— Holocys- 

 ous in pairs, which tltes * ab e rl - 

 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. Cin. 

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

 agara Gr. 



FIG. 886.— HoUxyMiirs hum- 

 mellli. Anterior side. 



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- 

 r i e s 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 se- 

 ries reaches 

 the mouth ; above these there are eight 



(>lates in the series which bore the am- 

 mlacral spines, and some smaller plates 

 surrounding the amhulacral 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 

 an d be- 

 tween it 

 and the 

 a m b u 1 a - 

 cral orifice; 



all the 

 plates po- 

 riferous in 



pain; 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. Ham i nel 1 , 

 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 < rr. 



ornatus, S. A. Miller, 1878, Jour. (in. 

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



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

 Mus. Nat. Hist., p. 357, Niagara <ir. 



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

 Soc. Nat. Hist., vol. 1, p. 132, Niagara < Jr. 



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

 Nat. Hist., vol. 1, p. 135, Niagara < rr. 



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. 



Fio. 887. — HoioojraUten bam* 



melli. Summit, view ; moutli 

 on the lnwer side. 



