90 The American Geologist. August, 1902, 
former genus, as established by De Koninck and Le Hon, 
This g-enus was founded by them (Recher. Crin. Carb. 
Belg., p. 118) upon two specimens from the Mountain lime- 
stone of Belgium, which they erroneously identified 
as Taxocrimis nohilis of Phillips. The Belgian au- 
thors, in noting the resemblances and differences, pro- 
posed to limit Taxocriiiiis to those species which do 
not possess interradials (interbrachials), and of which 
the calyx consists exclusively of basals and first ra- 
dials; — thus leaving their new genus to differ from it in 
the possession of interradials. Taxocrimis was clearly not so 
restricted by Phillips in establishing the genus, for he in- 
cluded in it several species which have a greater or less num- 
ber of interradials (interbrachials of current terminology) ; 
arid on this character alone it would not be practicable to 
separate the new genus. But in the description, and in the 
diagram accompanying it (p. 119), there is plainly shown a 
structure which will distinguish it sharply, not only from Tax- 
vcri)ius, but from nearly all other genera of this group yet 
found, — and that is the anal side : There the posterior basal, 
ii'istead of bearing directly a prominent, vertical row of anal 
plates— as in Taxocrimis and OnycJiocrimis — is angular above, 
and supports two anal or interbrachial ])lates succeeded b> 
others in several series, filling up the posterior interradius 
with solid plates. It has no radianal as in Sagenocrimts. The 
arms are isotomous, branching by regular successive bifurca- 
tu<ns, instead of by lateral ramules from two main arm divis- 
ions as in On\cJiocri)ius. These characters appear to be very 
constant in F. agassisi and other American species, except 
tliat sometimes there is a large anal plate interposed between 
the posterior basal and the succeeding two plates ; this plate, 
Vv"hen it occurs, is angular above, like the posterior basal in 
the regular form, and is followed by other ])lates in two or 
more series, filling the area. Whenever the anal side is ob- 
servable there is little difficulty in separating these forms from 
Taxocrimis and OnycJiocrimis. Sagoiocrimis differs in the 
calyx from Forbesiocrimis as Thenarocrimis from Cyathocri- 
mts. 
It is unfortunate that De Koninck and Le Hon supposed the 
Belgian specimens to be Taxocrimis nohilis, and took that spec- 
ies as type of the genus, — since, so far as we can judge from 
