PLATE V 
Hemipalaeaster schucherti sp. nov. The rays are numbered from I to V. In 
each ray, the radial plates are indicated by darkening their outlines. In the 
distal parts of the rays this may be done with some accuracy; in the more proxi- 
mal parts this is all guess-work. The basal supramarginals are indicated by S, 
and from these plates the remaining supramarginals may be traced readily as 
far as the tips of the rays. The inframarginals are well seen on the left side of 
ray I, and on both sides of ray II, along the more distal two-thirds of the rays. 
The dorsal interradials are indicated by i. The plates indicated by r may cor- 
respond to the basal radials of other species, but this is very doubtful. The 
former extent of the disc of this specimen is indicated by the broken circle. The 
two plates which are marked i, and which are enclosed by this broken circle, 
resemble the dorsal interradials in outline and are believed to have been located 
originally at the points on the circle with which these plates are connected by 
dotted lines. The original center of the disc probably was located near one of 
the two small crosses. The plate marked C may correspond to the centrodorsal 
of other species, but this is highly problematical. Moreover, the correct inter- 
pretation of the apparent opening toward the right of plate C is prevented by its 
poor state of preservation. If the plate marked M is the madreporite, it does 
not resemble the corresponding one in Palaeaster niagarensis. The arrange- 
ment and general appearance of the basal supramarginals and of the dorsal inter- 
radials, however, is similar. 
