105 
The form of the calyx is practically identical in P. KonineJd and P. 
princeps, hut is much more saucer-shaped in P. the two former being 
characterised by the very large size and massiveness of their plates. 
The infra-hasals are usually almost equal, hut in P. KonincJcl an 
inequality does certainly exist, the right antero-lateral plate being decidedly 
the larger. It is, however, more generally apparent in casts than in calices 
with the plates preserved. The projection of these plates cannot in any way 
he accepted as a generic distinction, as partly suggested by Wachsmuth and 
Springer, in the case of Scaphiocrimis. The infra-hasals are retired from view 
in P. Konincki and P. nodosus, hut project in P. princeps. 
The basal plates are very similar in the three species, five pentagonal 
and one hexagonal, and in the two larger forms are comparatively smooth and 
imornamented, hut in P. nodosus are produced into large central nodes. 
The radials are alike in P. Konincki and P. princeps, the articular 
facets for the costals extending the whole width of the plates, so that the 
lower portions of the rays are of nearly the same width as the radials, a strong 
Neocrinoid character. The radials of P. nodosus are unknown to me. 
The anal plate occupies precisely the same position in all three 
Australian species, perched on the top of the posterior basal, and interpolated 
between two radials, in a manner similar to that of the American species, 
P. carhonarius, P. riidis, &c. Such also is the case in ^siocrinus 
maguificus. In the Australian Crinoids it is a quadrangular plate, hut in the 
last named it is irregularly so. 
The costals of P. nodosus arc unknown, hut in those with which we 
are acquainted some slight variation appears to exist in the numher at the 
base of a ray. Fliialocrinus patens has two costals in each ray, P. Konincki 
has three, and so P. 'princeps appears to have. On the other hand, the 
American species proposed to he referred to the genus by the late Dr. P. H. 
Carpenter have but one, except jEsiocrinus, wherein there are “one or more 
brachials in each ray.” The costal axillary is said to be absent in the 
anterior ray of P. fScophiocrinusJ rudis. In JP. princeps there certainly is a 
costal axillary, and the same exists in P. Konincki, so that in this respect our 
Australian species seem to follow the Pussian rather than the American. 
