100 
The costals l>elow the axillaries in the two last named speeies are of the same 
width as the radials, and therefore qnite nidike many other Palaeocrinoids, 
sneh as the Platycrinida? and Cyatliocrinidte, in which these plates are very 
much less, and occupying a mncli smaller extent of the articular surface. 
There seem to he irregularities in the number of costals in eacli ray of 
P. prlnccps, which will be referred to in the specific description of that form. 
The quadrangular plates figured by Pc Koninclv,^ resting on the 
ventral edge of the anal, are repeated in JEaiocrinKS, for Miller and Gurley 
say that the anal in their genus “ is followed by two plates that connect with 
the base of the proboscis.”^ In P. prlnceps the posterior side is not pre- 
sented to view, and in P. nodosus it is not preserved above the anal plate. 
In neither of the Australian sj)ecics is any trace of the proboscis visible. 
The stem-facet is practically obliterated in P. nodosus, or at any rate 
represented by the merest tubercle ; it is very small in P. Konincki, but much 
larger in P. princeps. The stem in the last named was also moderately large 
(PI. XVIII, Pig. 1) ; but of the stems of the other Australian forms, specifically, 
I am unable to afford any information. It is possible that the apparently 
stemless condition of P. nodosus may be akin to the obliteration of the stem- 
facet in Agussizocrinus. In Comatula the same thing occurs, and we again 
Dud a like occurrence in the Neocrinoid 3I(n'supites. 
As here defined, JPhialocrhius is recognised as occurring in the 
Oarboniferous areas of Ilnssia and America, and in tbe Permo-Carboniferous 
of Eastern Australia, and probably India. Pr. AVilliam AYaagen has 
described, from the middle division of the Productus Limestone of the Salt 
Piange, in the Punjaub, a species as Cijolhocrinus goliathus, which, from his 
remarks, in comparing his detached plates with P. Konincki, certainly appear 
to place C. goliathus in congeneric relation with the Australian Crinoid. A 
second species was described by AA'aagen as Cgathocrinus virgaleusis, but it 
is unimportant. 
Tape. — Idhialocrinus patens, Trautschold. 
Australian Tgpe. — ThialoGrimis Konincki, Clarke, sp. 
Itange. — Carboniferous and Permo-Carboniferous. 
' Foss. Pal. Noiiv'.-Calles du Siul, 1877, Part .8, t. 6, f. 4. 
‘ Journ. Ciiioinnati Soc. Nat. Hist., isOO, Xllf, No. 1, p. 14. 
