222 



ECHINODERMA TA. 



[am.. 



Fig. 241— Agelacri 



nus i'i iifin iiHtii-n 

 sis. 



ing of a double series of alternating 

 plates, forming convex ridges, consti- 

 tuting part of the upper face, and bear- 

 ing two or more rows of ambulacral 

 pores ; ovarian or anal aperture is situ- 

 ated within the azygous interambula- 

 cral area, surrounded by cuneiform 

 plates. Type A. hamiltonensis. 

 billingsi, Chapman, 1860, Can. Jour., vol. 

 5, p. 358, Trenton Gr. 



cincinnatiensis, Roemer, 

 1851, Verh. Naturh, 

 Rhein. Wtstph., vol. 

 8, p. 372, and Ohio 

 Pal. vol. 1, p. 55, Hud. 

 Riv. <ir. 

 dicksoni, Billings, I 

 Rep. of Progr. Geo. 

 Sur. Can., p. 2M, and 

 Can. Org. Rem., Dec. 

 ade3,p.84,Treuton<.r 

 hamiltonensis, Vanuxem, ls4'_', Geo. Rep. 



3d Dist. N. Y., p. 158, Ham. lit. 

 holbrooki, James, 1887. Jour. Cin. Soc. 

 Nat. Hist., vol. 10, p. 25. Bud. Hi\. Gr. 

 kaskaskiensit, see Echinodiscus kaskaski- 



pileus. Hall, 1860, Adv. sheets, 24th Rep. 

 N. Y. St. Mus. Nat. Hist., p. 214. ami 

 Ohio Pal., vol. 1, p. 56, Hud. Kiv. (ir. 



septembrachiatus, Miller A Over, 1878, 

 Jour. Cin. Soc. Nat. Hist., vol. 1, p, 27, 

 Hud. Riv. <ir. 



squamosus, Meek <fe Wort hen, 1868. Proc. 

 Acad. Nat. Sci. Phil., p. 357, and Geo. 

 Sur. III., vol. 5, p. 573, Keok,uk (ir. 



gtellatus, see Hemicvstites stellatus. 



vorticellatus, Hall, 1866, Adv. sheets, 24th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 216, 

 and Ohio Pal., vol. 1, p. 57, Hud. Kiv. < .r 

 Allaqecrinus, Etheridge& Carpenter, 1881, 

 Ann. and Mag. Nat. Hist., p. 281. [Ety. 

 allage, change; trtnoM, lily.] Calyx 

 minute, pyriform, without ornamenta- 

 tion; basal s 5, anchylosed ; radialslx5; 

 arms 10; interradials none; column 

 round. Type A. austini. 



carpenteri, Wachsmuth, 1882, Bull. No. 1, 

 111. St. Mus. Nat. Hist., p. 40, and Geo. 

 Sur. 111., vol. 7, p. 341, Kaskaskia Gr. 

 Ai.locrinus, Wachsmuth and Springer, (in 

 press,) Geo. Sur. 111., vol. 8, p. 206. 

 [Ety. alios, another ; krinon, lily.] Calyx 

 small ; arms stout ; basals 3, small ; pri- 

 mary radials 3x5, first large, others 

 smaller; secondary radials 2 or 3, 

 rounded, quadrangular ; arms composed 

 of transverse plates; interradials two 

 or more deeply impressed ; column 

 small; canal pentangular. Type A. 

 typus. 



typus, Wachsmuth & Springer, (in press,) 

 Geo. Sur. 111., vol. 8, p. 207, Ni- 

 agara Gr. 

 Allocystites, n. gen. [Ety. alios, another; 

 kustis, bladder.] Small, irregularly sub- 

 elliptical, tapering below to a small 

 column ; plates polygonal, without defi- 

 nite order of arrangement and of very 



unequal size ; all the plates poriferous ; 

 mouth near the margin of the summit; 

 the plates which form it cover part of 

 the body, and on approaching the ori- 

 fice curve up so as to form part of the 

 opening. The collector says when 

 found it projected an eighth of an Inch, 

 and the plates forming the projection 

 were accidentally broken on". Tim am- 

 bulacral opening is upon the extreme 

 height of the summit, and projects 

 above the body, where it is covered by 

 minute plates form ing a pentagonal star. 

 Type A. hammelli. 

 hammelli, n. pp., Niagara Gr. In addi- 

 tion to the characters above ascribed to 

 the genus, the ranges of plates, if in 

 regular series, would form about six 

 series; the first series an- anchylosed 

 so that two plates only can be distin- 

 guished; in the second range there are 

 seven plates; above this the plates are 

 extremely variable in form and size, no 

 two of them being alike; only t « . n r 

 [dates are distinguished as forming the 

 month, but there is do reasonable doubt 

 there are five, and that one is narrow, 

 and situated between the mouth and 

 amhulacral orifice, as is usual in this 

 family of Cystidians. The projecting 



mouth-plates and elevated amhulacral 



opening specially characterise tbisgenns 



and species. The specific name is in 

 honor of Mr. .1. F. I lam mell, of Madison, 

 Indiana, who collected it in Jefferson 



< ounty. 



Fig. 242.— Allocystites bammelli. Bide and sum 

 mit view. 



Allophosallockinus, Casseday A; Lyon. 

 18(H), Proc. Am. Acad. Arts and Sci., 

 vol. 5, p. 29.] Ety. alloprosallos, inclin- 

 ing first to one side and then to another ; 

 krimm, lily.] Turbinate; basals 3; 

 primary radials 3 x 5 ; secondary radials 

 2 x 10 ; regular interradials 1 ; azygous 

 plates 3; vault elevated, bearing a cen- 

 tral tube or proboscis; arms 11 to 13; 

 distinguished from Agaricocrinus by 

 general form and fewer interradials. 

 Type A. conicus. 



conicus, Casseday <& Lyon, 1860, Proc. 

 Am. Acad. Arte and Sci., vol. 5, p. 29, 

 Warsaw Gr. 



eiiconus, see Batocrinus euconus. 



depressus, Casseday & Lyon, 1860, Proc. 

 Am. Acad. Arts and Sci., vol. 5, p. 31, 

 Warsaw Gr. 



