a 
ACTINOCRINIDZ&. ‘Sal 
Interbrachials not connected with the interambulacrals ; 
brachials from the distichals or palmars up extended 
into a broad, flanging rim as in Teleiocrinus ; arms very 
numerous; ventral disk low, composed throughout of 
very small, irregular pieces; anus subcentral. . . Strotocrinus. 
Geological and Geographical Distribution. 
Number of known species. 
(Open figures indicate American ; those marked (), European.) 
FORMATION. ACTINOCRINIDZ. 
A DN - 
oe 8 4 = 3 : : 
i Ss + Z AS q ° wa n 
E 3 Bg 5 8 ae erie eel een 
5) American. KH O'S H 5 5 5 = = = 
a QB 3 = e = 5) 5 8 
& a2°s g S vet 2 ic = £ 
a8 |S | 8. fee ee ee) alae alee 
aise < MD < 4 O = oe 
Keokuk. 5) 
: ; 6 1 3 1 5 Z 
Upper Burlington. a’ (15) (3) (?) (?) 
a ss las + = So) Tate? eae ts oe ee 
: 23 
5 Lower Burlington. 5 5 3 2 3 16 iL 
z= =H 
q Ps, eee $eticia Btn Sa abe |p adi ate porn 
je) as ae er re ae = ee 
an Kinderhook. 
5 Waverly. 8 1 1 Bs 
Chouteau. 
: 60 18 5 33 6 20 
Total species 78 u : 6 Dy 
: y (18) (15). Cyl mee 
Norz.— There are many synonyms among the forms described by de Koninck and other European 
writers under Actinocrinus ; others will have to be referred to different genera. 
Remarks. — The relations of the Actinocrinids and Batocrinids with 
other Camerata, and the distinctions between these two families, have been 
sufficiently pointed out in connection with the Batocrinidse. 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 Actinocrinide were a short lived family, appearing first in the 
Waverly group, and culminating in the large and striking forms of the 
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