if that trcims is worth retain iiig. which may Ijc cloubll'ul. 'I'licv liaxc no 

 resombhuice to A iii pliordcriiuifi. wliich is a gemis haviiij:; a quadraii- 

 ^ular second ])rimary radial, whicli allies the calyx to Balocruiitx, 

 and which has a ponderous high \aidt and larye proboscis. No true 

 AiiijilKinicriinis. as i'ei)resented hy the tyjie. .1. iiilltcrhdtii, ur \\w 

 allied s|)ecies. .1. (-(//'/.s. has ever l)ecn found in .America, and prohahly 

 all American species that liave been refem^l to .1 iiiiilinrdcriuiis belong- 

 to Acfinorriints. 



Found by R. A. Blair, iu tlie ("houteau limestone, at Seilalia. Mis- 

 souri, and now in tlu^ collection of S. A. Miller. 



Fa.milv D( )LAT( )CRINIDJ^:. 



DOL.ATOCRINrs NECiLECTlS. n. S]). 



J'IdIc 11. Vi^l- '.'7. hfisal ricir: Fi(/. i'.s'. siiiinuil: Fir/. 2!l. .sldf ricir. 



Species full medium size. Calyx low, basin shaped, a little more 

 than three times as wide as high, broadly and deeply concave below, 

 the depression including the second radials, and having a dee]) 

 funnel-shaped columnar pit which is bounded by a pentagonal rim. 

 The angles of the ];)eidagon unite with tlui radial ridges, and the fun- 

 nel within tlie rim is smooth or without ornamentation and extends 

 as high as tlie t(ip of the calyx. Radial ridges within the concavity, 

 angular ele\ations. but above, tlu-y are broken iido elongated angu- 

 lar nodes by the sutui'cs f)etween the plates. l^he surface of th<' in- 

 terradial areas is radiately sculptured from a ceidral pit, instead of 

 fi'om a central node: and other parts of the calvN are irregularly 

 sculptured. Column round and attached at the bottom of the funnel- 

 shaped columnai' pit. 



Rasals form a round cup <li-eply inserted in the calyx where they 

 rise as high as tlu' top of the calyx. The mouth of the cuj) is al)oul 

 one-third wider than thi' diameter of the column. First primarv 

 radials as long as wide, smooth lielow the pentagonal rim and scul))- 

 tured above it. Second primary radials twice as wide as long, (piad- 

 rangular. Third jirimary I'adials larger than the second. ]K'nlagonal 

 axillary, and, in each of four of the rays, bears u[)on one upper slop- 

 ing side four secondary radials, and upon the other a single sec- 

 ondary radial which is axillary and supports on each n])])er side 

 three tertiary railials. which arrangement gives to each of these rays 

 three arms. In the other ray. the third jiriraary radial bears upon 



