AKT.— AGA.] 



ECHINODERMA TA. 



673 



krinon, lily.] Column pentagonal, calyx 

 bowl-shaped, plates smooth or granular. 

 Basals five, forming a pentagonal, flat- 

 tened or concave disc. Subradials 

 large, four hexagonal, one heptagonal, 

 and curving upward half the height of 

 the calyx. First radials 5, truncated 

 above ; one or more brachials in each 

 ray supporting strong arms, composed 

 of a single series of plates; arms 10, 

 bearing pinnules. No regular inter- 

 radials. An azygous interradial rests 

 upon a subradial, between two first ra- 

 dials, and is followed by two plates that 

 connect with the proboscis. Proboscis 

 long, composed of four series of plates 

 bearing numerous transverse fissures 

 on the sides of the plates. Type M. 

 magnificus, described at the same place, 

 from the Up. Coal Meas. JE. harii was 

 described at the same time, and JE. 

 basilicus was described in Desc. New 

 Gen. and Spec. Echinodermata, p. 53, 

 from the Up. Coal Meas. All of which 

 were republished in 16th Rep. Geo. Sur. 

 Indiana, pp. 337, 338, and 369. 



Fig. 1207.— Aethocystites 

 sculptus. 



Aethocystites, S. A. Miller, 1892, Advance 

 Sheets 18th Rep. Geo. Sur. Ind., p. 9. 

 [ E t y . aethes, 

 unusual ; kus- 

 tis, bladder.] 

 This genus 

 consists of the 

 bodies of elon- 

 gated, subel- 

 f i p ticai Cy- 

 stoidea of un- 

 determined 

 family affinity. 

 Probably they 

 do not belong 

 to any defined 

 family. There 

 are only three 

 ranges of 

 plates. In the 

 fi rst range 

 there are three 

 plates, they 

 form an obconical cup, commencing 

 from a small column. In the second 

 range there are five elongated plates. 

 The third range consists 

 of five much shorter plates. 

 The plates are ornamented 

 with wrinkles, and bear 

 tubular ridges radiating 

 from a central point, in 

 the middle range, which 

 follow the longitudinal 

 sutures or center of the 

 first and third ranges, and 

 have porous connection 

 with the interior of the 

 body. The plates do not 

 possess pores after the 

 manner of Holocystites or 

 Caryocrinus, and no pores 

 have been determined, ex- 

 cept as above stated. Type 

 A. sculptus. Described 

 at the same place, from 

 the Niagara Gr. 

 Ag an aster, Miller & Gurley, 

 1890, Desc. New Gen. and 



Fig. 1206.— ^Esiocrinus magnificus. 



lykinsi, Butts, 1891, Kansas City Scientist, I 

 vol. 5, p. 144, Coal Meas. 



Fig. 1208.— Aganaster 

 gregarius. Dorsal 

 side. 



Spec. Echinodermata, p. 

 57, republished in 16th 

 Rep. Geo. Sur. Ind., p. 

 372. [Ety. agan, very 

 much; aster, star.] Cir- 

 cular disc with five long, 

 narrow rays. Dorsal side covered with 

 small polygonal plates, not inter- 



