706 THE VOYAGE OF H.M.S. CHALLENGER. 
j. BLuE Mop. 
BATHYMETRICAL ZONE. 
Occurrence on other Deposits. 
Littoral. | Continental. | Abyssal. 
ARCHASTERIDE. 
PaRARCHASTERIN &. 
Pararchaster semisquamatus  . : + 
Pararchaster semisquamatus, vay. 
occidentalis. ; c i = 
Pararchaster antarcticus . C 4 + 
Pararchaster armatus . C ad Onn + 
Pontaster planeta . 0 B 6 one + 
Pontaster teres 6 : : ' + asa 
Pontaster forcipatus : ° 0 + 
Pontaster pristinus . 9 . C + 
Pontaster trullipes . . : : + 
PLUTONASTERINE. 
Dytaster exilis, var. carinata . 5 + 
Dytaster madreporifer . S + 
Dytaster nobilis - : 0 + 
Dytaster inermis . c 6 + 
Plutonaster bifrons . : 3 + 
Plutonaster rigidus . ; : 5 + 
Plutonaster rigidus, var. senviarmata. + 
PSEUDARCHASTERINE. 
Pseudarchaster discus , ; . + 
PORCELLANASTERID. 
PORCELLANASTERINA. 
Porcellanaster ceruleus . 5 : + 
Porcellanaster tuberosus . 5 c + 
Porcellanaster gracilis, . + 
Hyphalaster diadematus . a 0 + 
Hyphalaster inermis é o : + 
CTENODISCINE. 
Ctenodiscus procurator . : . + + + 
ASTROPECTINID®, 
ASTROPECTININ A. 
Leptoptychaster arcticus, var. elongata Sere +f 
Astropecten acanthifer . 5 + ele 
Astropecten japonicus 5 3 . + 
Psilaster acuminatus C ; : + 06 aes 
Psilaster gracilis. : C 6 sr 
Phoxaster pumilus . ° : : Boo + 
Bathybiaster loripes c : 5 a 
PFENTAGONASTERIDE. 
PENTAGONASTERINE. 
Pentagonaster patagonicus 0 : 00 4F 
Nymphaster symbolicus, var. brevi- 
radiata . S . ° \ a 
Paragonaster ctenipes , . : + sos . 
GONIODISCINA, 
Stellaster incet C fs < 9 $F 
MIMASTERIN 2, 
Mimaster cognatus . 3 $ Fi + + 
Also Green mud. 
Also Sand and Mud. 
Also Green mud, 
