224 



ECHINODERMA TA. 



[ANO. ARC 



and supposed to possess a tube or pro- I 

 boscis; column large and longitudinally I 

 from 5 to 20 partite. Type A. in- j 

 curyus. 



caponiformis, Lyon, 1869, (Ataxocrinus 

 caponiformis,) Trans. Am. Phil. Soc., 

 vol. 13, p. 464, and Jour. Cin. Soc. Nat. 

 Hist, vol. 2, p. 109, Hud. Riv. Gr. 



V ^^ 



FIG. 246. Anomalocriiius iucurvus. Diagram. 



incurvus, Meek & Worthen, 1865, (Hetero- 



crinus incurvus,) Proc. Acad. Nat. Sci. 



Phil., p. 148, and Geo. Sur. 111., vol. 3, 



p. 327, Hud. Riv. Gr. 



ANOMALOCYSTITES, Hall, 1859, Pal. N. Y 



tical, sides unequal, vertical outline oval 

 or ovoid ; first series of plates 3 on the 

 convex and 2 on the flat or C9ncave 

 side; second series 4 or 5 on the convex 

 side and 2 on the concave side ; third 

 series 4 on the convex and 1 on the j 

 other; succeeding series have smaller j 

 plates and the apex is unknown ; i 

 column large at the body and very ! 

 rapidly tapering; no pores or pecti- I 

 nated rhombs. Type A.cornutus. Weth- 

 erby supposed this to be a Crustacean j 

 and gave it the name of Enoploura. 



Fia. 247. Anomalocystites balanoides. 

 Convex and flattened sides. 



balanoides, Meek, 1872, Am. Jour. Sci., 



3d ser., vol. 3, p. 423, and Ohio Pal., 



vol. 1, p. 41, Hud. Riv. Gr. 

 cornutus, Hall, 1859, Pal. N. Y., vol. 3, 



p. 133, Low. Held. Gr. 

 disparilis, Hall, 1859, Pal. N. Y., vol. 3, 



p. 145, Oriskany sandstone, 

 huxleyi, Billings', 1858, (Ateleocystites I 



huxleyi,) Can. Org. Rem., Decade 3, p. 



72, Trenton Gr. 



Anomaloidex, Ulrich, 1878, Jour. Cin. Soc. 

 Nat. Hist., vol. 1, p. 92. A word con- 

 structed of adjectives making it mean- 

 ingless, contrary to the ruks of nomen- 

 clature, and the attempt to found a 

 genus was made on a fossil fragment 

 not understood. 



reticulatus, Ulrich, 1878, Jour. Cin. Soc. 

 Nat. Hist., vol. 1, p. 92, Hud. Riv. Gr. 

 A fossil fragment not understood. 

 APIOCYSTITES, Forbes, 1848, Mem. Geo. Sur. 

 Great Brit., vol. 2, p. 502. [Ety. apwn, 

 pear; kustis, bladder.] Body oVoid, or 

 oblong oval, angular and covered by 

 four series of plates ; first series has 4 

 plates: second series 5; third series 5 

 or 6 ; fourth series 5 or more ; arms 4, 

 recumbent and filling shallow grooves 

 at the angles of the body , column rap- 

 idly tapering; ovarian aperture near 

 the summit, on the anterior side; all 

 the plates bearing calycine pores; a 

 pectinated rhomb upon each side in 

 the 3d and 4th series, and one on the 

 anterior side in the 2d series, but these 

 may be variable. Type A. pentrermt- 

 oides. 



canadensis, Billings, 1866, Catal. Sil. Foss. 

 Antic., p. 90, Niagara Gr. 



elegans, Hall, 1852, Pal. N. Y., vol. 2, p. 

 243, Niagara Gr. 



huronensis, Billings, 1866, Catal. Sil. 



Foss. Antic., 

 mag 

 Mus. Nat. Hist., p. 358, Niagara r 



tecumseth, Billings, 1866, Catal. Sil. Foss. 



Antic., p. 91, Niagara Gr. 

 ARACHNOCRINUS, Meek & Worthen, 1866, 

 Geo. Sur. 111., vol. 2, p. 177. [Ety. 

 arachne, spider ; krinon, lily.] Calyx 

 small, resembling Cyathocrinus, but 

 more depressed ; basals 5 ; subradials 

 5 ; radials 3x5; arms long, robust, 

 spreading, furrow deep ; no pinnules ; 

 azygous plate supporting a lateral tube ; 

 column round. Type A. bulbosus. 



bulbosus, Hall. 1860, (Cyathocrinus bulb- 

 osus,) 15th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 123, Up. Held. Gr. 



extensus, Wachsmuth & Springer, 1879, 

 Revis. Palreocrinoidea, p. 93, Ham. Gr. 



knappi, Wachsmuth & Springer, 1879, 

 Revis. Palseocrinoidea, p. 93, Ham. Gr. 



pisiformis, Roemer, 1860, . 

 (Poteriocrinus pisifor- 

 mis,) Sil. Fauna W. 

 Tenn., p. 54, Niagara (ir. 

 Wachsmuth says it is a 

 Lecanocrinus. 



ARCH^OCIDARIS, McCoy, 

 1844, Carb. Foss. Ireland, 

 p. 173. [Ety. archaios, ancient; f-iduris, 

 turban.] Spherical ; ambulacra narrow, 

 each composed of two ranges of plates, 

 with two pores in each plate ; interam- 

 bulacral plates large, thin, each with a 

 large, perforated, central tubercle, sur- 

 rounded, at its base, by a smooth ring, 

 and rounded, at the base, for the artic- 



'MAI.OCYS, nan, wow rau s. i. Fosg Antic 91 Ni agara ( - r 



vol 3,p 132. [Ety . ono/wotos, irregular; im Hal , 18 F 67 20th Re N Y . St. 



kitstis, bladder.] Somewhat semiellip- ! Mus. Nat, Hist,. D. 358. Niaeara <Jr. 



FlQ 



Arachn'ocrinus 

 pisiformis. 



