On Certain Crinoid Genera. — Springer. 91 
the description and specimens available, it does not possess 
the structure of the anal side characteristic of their genus. 
Some years ago I examined Phillips' type specimen in 
the Gilbertson collection in the British Museum. The plates 
of the anal side were not well preserved, but it seemed to me 
clear that the area had not been filled by plates resting on 
an angular posterior basal, as in the Belgian species. The 
two interbrachial areas visible contain one or two plates, and 
they are very different from the anal side, which is much wider, 
and presents the appearance of having been occupied by a ver- 
tical series of plates on a truncate posterior basal, with prob- 
ably small, irregular ones at the side, as in the American spec- 
ies of Taxocrinus. T. egertoni, the first species arranged by 
Phillips under Taxocrinus, has at least one interbrachial, but 
the anal side is not shown ; and the same may be said of T. 
macrodactylus. his third species. They are Subcarbonifer- 
ous species,* like T. nobilis, and it seems probable that they 
possessed a similar anal side, — though T. egertoni has rath- 
er the appearance of an Onycliocrinus in its very long rays. 
The fact that De Koninck and Le Hon erroneously identi- 
fied T. nobilis with their Belgian specimens, and took the 
specimens thus incorrectly referred to that species as tvpical 
of their genus, does not, in my opinion, make the true T. no- 
bilis the type of the genus, notwithstanding their statement to 
that effect. It seems to me a far better course to take as type 
the form and species which they actually described and fig- 
uted, for that is the best evidence of what they intended and 
understood. Thus the real type of the genus is Forbesiocrinus 
nobilis De KonincJ^ and Le Hon (not Pliillips). 
The subject is further complicated by a remark of Wachs- 
.muth and Springer (Mon. Crin. Cam. p. 77) to the effect 
that the Belgian species belongs to Onychocrinus. This was 
based upon a specimen obtained from Belgium which was 
thought to show the anal plates and arms as there stated. 
After having thoroughly freed the specimen from the matrix 
I find that the observation was not correct, but that it has 
the angular posterior basal followed by two anal or inter- 
brachial plates, just as in De Koninck and Le Hon's de- 
scription, and as a])pears in P. agassizi and other American 
* Whidborae {Mon. Dev. Fauna, 1898, vol. iii, pt. Ill, p. 215) gives T. 
macrodactylus as Devonian. 
