186 



THE VOYAGE OF H.M.S. CHALLENGEE. 



XL— CLASSIFICATION. 



The following is the classification of the Stalked Echinoderms which is adopted in 

 these Eeports : — 



Phylum, ECHINODEEIilATA. 



Branch, PELMATOZOA. 



Class L Ck I NO IDE A. 

 Class 2. C Y S T I D E A. 



Class 3. Blastoidea. 



Pelmatozoa, Leuckart, 

 1848. 



Synonymy and other Classifications. 



Bracliiata. 



Grinoidea, Burmeister, 

 18.56. 



Cnwoiiea,Eoemer, 1856. - 



Tentaculata, Kay- 



Lankester, 1877. 



Crinoidea, Zittel, 1880; 

 and de Loriol, 1882. 



Antliodiata. 



An order of the 

 EcMnodermata, 



Three suborder.s. 



A branch of the Phylum 

 Echinodermata, 



Three classes. 



A class of the Stamm 

 Echinodermata. 



Three orders. 



1. Crinoidea, sensn. str. 

 ( 2. Cystidea. 

 ( 3. Blastoidea. 



1. Actinoidea = 

 Crinoidea, sensu. str. 



2. Cystidea. 



3. Blastoidea. 



\ I. Crinoidea. 

 \ II. Blastoidea. 

 [ III. Cystidea. 



1. Eucrinoidea = 

 Crinoidea, t-ensu.str. 



2. Cystoidea. 



3. Blastoidea. 



PELMATOZOA. 



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, butma}^ be lost when maturity is reached ; or, in the case of a few sessile forms, 



