ACXmOCEINID^. 



Interbraohials not connected with the interambulaorals ; 

 brachials from the distiohals or palmars up extended 

 into a broad, flanging rim as in Teleiocriims ; arms very 

 numerous ; ventral disk low, composed throughout of 

 very small, irregular pieces ; anus suboentral . . . 



561 



Strotocrinus. 



Geological and Oeographical Distribution. 



Number of known species. 



(Open figures indicate American ; those marked ( ), European.) 



POE>[ATIOX. 



AcTINOCKINID.a:. 













M 



m 









"1 



American. 



ximat 



eau 



alents 



m 



a 

 ^ 



,3 







CO 



.2 









Ph t> 

























^23 



c< 3 a< 







CD 



m 



5 







2 







<1 Wfil 









3 



-3 



C3 



1) 











< 



cc 



<; 



Ph 







B 



tc 





Keokuk. 





5 

















6 



1 





3 



1 



5 



2 





Upper Burlington. 



9 3 



(15) 





(3) 



(?) 



(?) 







m 





'3 S 



1i M 

































S 



■3 



Lower Burlington. 



§ 3 

 ^3 



4 



3 



2 



3 



16 



1 





















■f. 



Kinderhook. 



















ri 

 



Waverly. 

 Chouteau. 





3 



1 



1 





3 







Total species 78 V ,.^, 



18 

 (15) 



5 



3 



(3) 



6 



(?) 



20 

 (?) 



6 



2 



Note. — There are many synonyms among the forms described by de Eouinck and otlier European 

 writers under Actinocri?ms ; others wiU have to be referred to different genera. 



Remarks. — The relations of the Actinocrinidfe and Batocrinidfe with 

 other Camerata, and the distinctions between these two families, have been 

 sufficiently pointed out in connection with the Batocrinid^. The absence of 

 an anal plate between the two interbrachials of the first row, and the alter- 

 nate mode of bifurcation of the arms, will always distinguish an Actinocrinoid 

 from a Batocrinoid. 



The Actinocrinidee were a short lived family, appearing first in the 

 Waverly group, and culminating in the large and striking forms of the 



