Arme. Furepapillerne samt Piggene 
paa Armenes Sider stærkt takkede. 
10”” Diameter. Den lille til den 
store Radius som 1:5. Furepapil- 
lerne stærkt takkede. 2 Arme lidt 
kortere end de øvrige. 
No. 4. 
Samtlige Maal ere tagne efter de lengste Arme. 
I den tidligere citerede Afhandling over Echinodermer 
fra Vest-Gronland har Dr. Sladen beskrevet en ny Art af 
Pedicellaster under Navn af Ped. palæocrystallus. Ved 
nølagtigt at gjennemgaa hans Beskrivelse, ledsaget af Teg- 
ninger, og ved at sammenholde denne med vore Undersø- 
gelser baade af Sars's Originalexemplar, Pedic. typicus, og 
af de mange Exemplarer, vi forøvrigt have disponeret over, 
ere vi komne til det Resultat, at Pedic. palæocrystallus er 
identisk med Ped. typicus, hvilket vi nærmere skulle be- 
grunde. De Kjendemærker, der skulde adskille Ped. palæ- 
ocrystallus fra typicus angiver Sladen at være Følgende: 
ps Ped. paleocrystallus is of larger size, and the length 
of the arm-radius, in proportion to that of the disk (about 
5:1), is less than in Ped. typicus, in the largest examples 
of which, it is 6'/, or 6:1. The contour of the arms is 
also different in our form, being more tumid on the inner 
third, and much more attenuated on the remaining out- 
ward portion of the ray. The dorsal spinelets are decid- 
edly radio-laminate and somewhat expanded at the tip, 
instead of being conical as described in typicus, and the 
shaft of the ambulacral spinelet is also denticulate or ser- 
rate. The pedicellariæ in the present species are even of 
relatively larger size, and differ in having the contour of 
the jaws considerably swollen out about the outer third, 
and then tapering rapidly towards the extremity, which is 
somewhat truncate. Indeed the general facies of the ap- 
pendage is unmistakably distinct from that of the more 
southern form.“ 
Vi have ovenfor angivet Maalene paa vore Exempla- 
rer, hentede fra de forskjelligste Lokaliteter, og det vil deraf 
sees, at saavel Storrelsen som det indbyrdes Forhold imel- 
lem Skive og Arme varierer temmelig meget. Paa enkelte 
Exemplarer vare Armene ved deres Grund tykke, hvorved 
disse fik et mere konisk Udseende. De dorsale Pigge havde 
paa alle Exemplarer den samme Form, som Sladen beskri- 
ver, og det samme var Tilfældet med Ambulacralpiggene, 
hvilket vi tidligere have paavist. Heller ikke have vi, hvad 
Pediceilarierne angaar, Form eller Størrelse 
været istand til at opdage nogen Forskjel fra dem, der ere 
beskrevne og afbildede hos Sladen. 
De Forskjelligheder, der efter Sladens Formening 
skulde skille hans nye Art fra Sars's, ere dels ikke kon- 
 stante, dels mangle de ganske, men ere sandsynligvis op- 
stillede af Sladen paa Grund af en mindre korrekt Beskri- 
hverken i 
39 
rays. The furrow-papille, also the 
spines of the lateral surfaces of 
the rays are strongly aculeated. 
10” in diameter. The propor- 
tion of the disk-radius to the 
brachial radius is as 1:5. The 
furrow-papille are strongly acul- 
NOM 
eated. 2 rays somewhat shorter 
than the others. 
The longest ray is the basis of all the above measure- 
ments. 
In the previously quoted memoir on Echinodermata 
from West Greenland, by Dr. Sladen; he has described a 
new species of Pedicellaster, under the designation of Ped- 
icellaster palcocrystallus. By closely studying his deserip- 
tion, accompanied by drawings, and comparing these, with 
our observations, both, of Sars’ original specimen Pedicell- 
aster typicus, as well as the numerous specimens which we have 
had at our disposal, otherwise, we have arrived at the con- 
clusion, that Pedicellaster palæocrystallus is identical with 
Pedicellaster typicus, and we shall substantiate this more 
fully. The distinguishing features between Pedicellaster 
paleocrystallus and Pedicellaster typicus are stated by Sla- 
den to be the following: — 
» Ped. palæocrystallus is of larger size, and the length“ 
sof the arm-radius, in proportion to that of the disk (about 
sd:1) is less than in Ped. typicus, in the largest examp-* 
ples of which, it is 6'/,0r6:1. The contour of the arms“ 
is also different in our form, being more tumid on the in-* 
,ner third, and much more attenuated on the remaining“ 
soutward portion of the ray. The dorsal spinelets are“ 
»decidedly radio-laminate and somewhat expanded at the“ 
»tip, instead of being conical as described in typicus, and“ 
»the shaft of the ambulacral spinelet is also denticulate* 
,or serrate. The pedicellariz in the present species are“ 
seven of relatively large size, and differ in having the con-* 
stour of the jaws considerably swollen out about the outer“ 
»third, and then tapering rapidly towards the extremity,“ 
»which, is somewhat truncate. Indeed the general facies“ 
,of the appendage is unmistakably distinct from that of the“ 
»more southern form.“ 
We have stated above, the dimensions of our speci- 
mens, taken from the most different localities, and it will 
be seen therefrom, that the size, as well as the mutual pro- 
portion between the disk and the rays, varies a good deal. 
In a few specimens the rays were thick at their origin, 
and this them a more coniform appearance. The 
dorsal spines, had, in all the specimens, the same form 
which has been deseribed by Sladen, and, as we have al- 
gave 
ready shown, this was, also, the case with the ambulacral 
spines. Neither, have we, in regard to the pedicellariæ, 
been able to discover, either in form or size, any difference 
from those described and illustrated by Sladen. 
The features which in Sladens opinion separates his 
new species from Sars’, are, partly, not constant, and partly, 
are entirely awanting, and have been arrived at by Sladen, 
presumably, in consequence of Sars’ partially incorrect de- 
