186 THE VOYAGE OF H.M.S. CHALLENGER. 
XI.—CLASSIFICATION. 
The following is the classification of the Stalked Echinoderms which is adopted in 
these Reports :— 
Phylum, ECHINODERMATA. 
Branch, PELMATOZOA. 
Class 1. CRINOIDEA. 
Class 2. CysTIDEA. 
Class 3. BLASTOIDEA. 
Synonymy and other Classifications. 
{ Brachiata. 
Crinoidea, Burmeister, 
Hehe Anthodiata. 
[ 
| An order of the class 
1 : 5 
Crinoidea, Roemer, 1856. + EEE 
| 
| Three suborders. 
Prtmatozoa, Leuckart, | l 
1848. 
A branch of the Phylum 
Tentaculata, Ray- 4 Echinodermata. 
Lankester, 1877. 
[ Three classes. 
f 
A class of the Stamm 
Crinoidea, Zittel, 1880 ; Echinodermata. 
and de Loriol, 1882. 
Three orders. 
PELMATOZOA, 
H 
t 
| 
| 
| 
| 
| 
1. Crinoidea, sensu. str. 
. Cystidea. 
Blastoidea. 
om 
. Actinoidea = 
Crinoidea, sensu. str. 
2. Cystidea. 
3. Blastoidea. 
LL Crinoidea. 
IL Blastoidea. 
III. Cystidea. 
1. Eucrinoidea = 
Crinoidea, sensu. str. 
2. Cystoidea. 
3. Blastoidea. 
Definition.—Echinoderms which are fixed either permanently or temporarily by the 
middle of the aboral surface. A jointed stem containing a neuro-vascular axis is usually 
present, but may be lost when maturity is reached ; or, in the case of a few sessile forms, 
