AMP. — ANO.] 



ECHINODERMA TA. 



223 



Ampheristocrinus, Hall, 1879, Desc. New 

 Spec. Foss., p. 11, and 11th Rep. Geo. 

 and Nat. Hist. Indiana, p. 278. [Ety. 

 ampheristos, disputed ; krinon, lily.] 

 Turbinate, base attenuate; azygous 

 area, large ; plates 6 ; basals 3 ; subradi- 

 als 5 ; radials 1x5, with a narrow cica- 

 trix on the middle of the top of each 

 for the attachment of the arms; no 

 regular interradials. Type A. typus. 



Fig. 243.— Ampheristocrinus typus. Basal and 

 side view of calyx. 



typus, Hall, 1879, Desc. New Spec. Foss., 

 p. 11, and 11th Rep. Geo. and Nat. Hist. 

 Indiana, p. 278, Niagara Gr. 

 Amphoracrinus, Austin, 1848, Quar. Jour. 

 Geo. Soc. Lond., vol. 4, p. 292, and Geo. 

 Sur. 111., vol. 5, p. 386. [Ety. amphora, 

 cup ; krinon, lily.] Body short, lobed, 

 dome elevated, with tube or proboscis 

 excentric on the azygous side; basals 

 3; primary radials 3x5; secondary ra- 

 dials 1x10; arms numerous, variable, 

 composed of a double series of plates ; 

 regular interradials 3 ; azygous inter- 

 radials, 3 or 4 large ones and a few 

 smaller ones; column round. Type A 

 gilhertsoni. 



americanus, see Agaricocrinusamericanus. 



bellatrema, see Agaricocrinus bellitrema. 



divergens, Hall, 1860, (Actinocrinus di- 

 vergens,) Supp. Geo. Rep. Iowa, p. 36, 

 and Geo. Sur. 111., vol. 5, p. 388, Burl- 

 ington Gr. 



excavatus, see Agaricocrinus excavatus. 



influtiix, eee Agaricocrinus inflatus. 



jersevensis, Worthen, (in press,) Geo. 

 Sur. 111., vol. 8, p. 96, Kinderhook Gr. 



Fig. 244.— Amphoracrinus virainalis. 



planobasalis, Hall, 1858, (Actinocrinus 

 planobasalis, ) Geo. Rep. Iowa, p. 19, 

 Burlington Gr. Wachsmuth says it is 

 a syn. for A. divergens. 



quadrispinus, White, 1862, (Actinocrinus 

 quadrispinus, ) Proc. Bost. Soc. Nat. 

 Hist., vol. 9, p. 15, Burlington Gr. 

 Wachsmuth says it is a syn. for A. di- 

 vergens. 



spinobrachiatus, Hall, 1860, (Actinocrinus 

 spinobrachiatus,) Supp. Geo. Rep. Iowa, 

 p. 6, and Geo. Sur. 111., vol, 5, p. 389, 

 Burlington Gr. 



viminalis, Hall, 1864, (Actinocrinus vimi- 

 nalis,) 17th Rep. N. Y. St. Mus. Nat 

 Hist., p. 54, and Ohio Pal., vol. 2. p 

 165, Waverly Gr. 

 Amygdalocystites, Billings, 1854, Can 

 Jour., vol. 2, p. 270, and Can. Org 

 Rem., Decade 3, p. 63. [Ety. amygdalos 

 almond ; kustis, bladder.] Body flat 

 tened, ovate, covered with nonporifer- 

 ous plates arranged without order ; 

 ambulacral opening at the apex, mouth 

 near by; arms recumbent, composed of 

 a double series of plates; column round. 

 Type A. florealis. 



florealis, Billings, 1854, Can. Jour., vol. 2, 

 p. 270, and Can. Org. Rem., Decade 3, p. 

 63, Trenton Gr. 



florealis var. lsevis, W. R. Billings, 1883, 

 Trans. No. 4, Ottawa Field Nat. Club, 

 p. 52, Trenton Gr. 



huntingtoni, Weth- 

 erby, 1881, Jour. 

 Cin. Soc. Nat. 

 Hist., vol. 4, p. 

 177, Trenton Gr. 



radiatus, Billings, 

 1854, Can. Jour., 

 vol. 2, p. 271, and 

 Can. Org. Rem., 





n M 



rn 





Fig. 245.— Amygdalo- 

 cystites huntingtoni. 



Decade 3, p. 65, 

 Trenton Gr. 

 tenuistriatus, Bil- 

 lings, 1854, Can. 

 Jour., vol. 2, p. 

 271, and Can. Org. 

 Rem., Decade 3, 

 p. 64, Trenton Gr. 



Ancyrocrinus, Hall, 1862, 15th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 89. [Ety. ankura, 

 grapnel ; krinon, lily.] A bulb with 

 lateral ascending processes and a central 

 column. But little is known of this 

 genus. Type A. bulbosus. 

 bulbosus, Hall, 1862, 15th Rep. N. Y. St. 



Mus. Nat. Hist., p. 90, Ham. Gr. 

 spinosus, Hall, 1862, 15th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 90, Up. Held. Gr. 



Anomalocrinus, Meek & Worthen, 1868, 

 Geo. of 111., vol. 3, p. 327. [Ety. anom- 

 alos, irregular ; krinon, lily.] Calyx de- 

 pressed, irregularly saucer-shaped ; ba- 

 sals 5 ; sometimes a 6th intercalated one ; 

 radials 1x3 and 2x2, the last ones 

 truncated in the central part for the 

 free arms, and curving over on the 

 vault on either side, thus widely sepa- 

 rating the arms ; arms irregular, fre- 

 quently bifurcating, composed of a 

 single series of plates, round on the ex- 

 terior; pinnules strong; vault convex 



