101 
I know uotliing about the anal side iu the three species of Group B, hut in 
all the five species of Group A, the anal plate enters the ring of radials and 
rests on a basal, just as iu^the case in Cjjathocrinus ; and I cannot com- 
prehend how the Authors in question can have placed these species in the 
same genus with Graphiucrinus encrinoides. Their doing so is the more 
remarkable as they separate Ceriocrinus from Jdrisocriims for a precisely 
similar difference. 
“ Scaphiocrinus simplex, one of the species in Group A, Avas Hall’s 
typo of Scaphioarinus, and he distinguished it clearly enough from GrapMo- 
crinus, expressly stating that the basal of the anal side ‘ is truncated above by 
the first anal plate.’^ Wachsmuth and Springer, however, transferred this 
and similar species to Grapliiocrium, and enlarged the definition of the 
latter accordingly. This left Scaphiocrlnus Avithout a type, and so they 
made Hall’s second species, S. dichotomus, the type of the genus, in Avhich 
they have been followed by S. A. .Miller and others. 
“ What, then, are Ave to do with Scaphiocrlnus simplex, and its four or 
more allies ? Strictly sjieaking, I supjiose that Hall’s name should lie 
restored, and a ncAV one found for S. dichotomus and the rest. This should, 
I think, be done, Avere it not that S. simplex, &c., all agree Avith Trautschold’s 
Jdhialocrimis patens, in haAung the posterior basal truncated by the anal 
plate, which rests upon it, and forms part of the ring of radials, and I Avould 
therefore transfer S. simplex, and its four or more allies to Fhialocrinus, 
making this character the generic difference betAveen the latter and Graphio- 
crinus. Scaphiocrinus 3I‘Adamsi and S. torliiosus (/) are described as haAung 
the basals unequal, and should probably be called Fhialocrinus also. Of 
Graphiocrinus longicirrifer, W, and S.,^ Wachsmuth and Springer tliein- 
selves remark tliat the basal of the azygous side ‘ is considerably larger and 
heptagonal, sujiporting on its truncate upper face a large anal plate, which 
extends far beyond the top of the radials, and actually forms a part of the 
Amntral tube.’ Hoav can they place this in the same genus with G. 
encrinoides ? In fact, they seem to liaAm entirely forgotten the structure of 
this, the type species of the genus ! for they say of Graphiocrinus — ‘ It has 
only an anal, and this is small and placed betAveen the radials, resting upon 
the truncate upper side of the posterior basal.’ And yet in the type species 
De Koninck pointed out hoAV the anal plate is ‘ adjacente a qiiatre autres 
^ Illinois Geol. Survey Report, 1890, VIII, p. 193, t. 17, f. II. 
