692 THE VOYAGE OF H.M.S. CHALLENGER. 
(3.) ABYSSAL ZONE. 
Species found in depths greater than 500 fathoms. 
At or greater than 
500 | 750 | 1000 | 1500 | 2000 | 2500 
Greatest 
Depth 
recorded 
Occurrence in other 
Zones, 
eeeeee 
eeeeee 
A RCHASTERIDZ:. 
PARARCHASTERINE. 
Pararchaster semisquamatus 5 a) \lhesa:|encad| | aes Wor Ao | isa) 
Pararchaster semisquamatus, var. occidentalis Beli eee al, ack yl ce: ese 1700 
Pararchaster antarcticus . ‘ : wal Reselewesnlll nes + 1675 
Pararchaster pedicifer . ' : Aa liscceull eee + 1900 
Pararchaster armatus . . x mt ligeecia levee aly ects 1350 
Pontaster forcipatus . ° c A al cece fesse tcf mies 1700 
Pontaster forcipatus, var. echinata Bl vessel seen acteaalleerceraliess 1375 
Pontaster mimicus . : : 6 Se li-aoo nse [leoodel | onc |lmaackl pense 800 
Pontaster pristinus . : ‘ c a lixcoe lll ook inesaidfiesean lteseuill see 000 
Pontaster venustus . : O 6 Gt aoa) Se Hisas |} one | 4B 2025 
Pontaster trullipes . 5 : ‘ Silleacor|becooe |e? eh doo.|| eps 1050 
Pontaster subtuberculatus . 5 A Sal vere dl) eel oecalaass 950 
PLUTONASTERIN&. , ‘ 
Dytaster spinosus . ‘ 2 = oil eeeroau|etesenl|i seem | eeceld [ects 2050 
Dytaster exilis 9 . : else cet |) Eun apes 1375 
Dytaster exilis, var. gr actlis : ; A in en 1900 
Dytaster exilis, var. carinata . 5 Bil teece | ecreoill hycers onl eacks 1700 
Dytaster madreporifer A 8 c oli acer |Ihreseyel [ictal acct) alleseeectal lees seat [eis OO 
Dytaster nobilis c . . > 6 |ihdon Hhecoss lan «|| 50, ||l) cae |). Se SEG 
Dytaster xquivocus . : c : e |iceas: hee ylceoe tll wom flees 800 
Dytaster biserialis . ; - sv iHhsero'e) ||! seaul|iasses [ieesenl| trate 2025 
Dytaster inermis . z : : elise ||| Rdotel| cetera tek 2150 
Plutonaster bifrons . i : A Bl ietsieeall roe, | ect all eee 1340 
Plutonaster rigidus . B illetei dll Seva icctalll stale ee 1700 
Plutonaster rigidus, var. semiar’ mata .  [leessei|iasen ae 1350 
Plutonaster ambiguus : és : ) UtiSeesrey | aal|f teri | cars 950 
Plutonaster notatus . 5 < ; oillcog- ||P ose IF Soil 6 1000 
Plutonaster abbreviatus  , ~. . ap lhe oe 1000 
Lonchotaster tartareus . ‘ i al eccew race les a aes 2400 
Lonchotaster forcipifer  . 0 e ||) Sewer Sees alll cement) act 1975 
PSEUDARCHASTERINE. 
Aphroditaster gracilis 5 ; . a lipsse Hl eeeeuill gee s-- || LOOO 
PORCELLANASTERID:. 
PoRCELLANASTERINE, 
Porcellanaster cxruleus , 5 ; i eee | seem fier 1350 
Porcellanaster caulifer c : 5 || coe || 4 soe 800 
Porcellanaster tuberosus : ‘ sinter a | Clason] ecteet | acer 1875 
Porcellanaster crassus . C : Pipl dered (scseal Recoee | tocol ies 2335 
Porcellanaster gracilis , . : fel), SHom || Scom| sao aliosa | Se! [frase eee 
Porcellanaster eremicus  . ; : Ball coon! cde || dadall eao.|ane d[ See |) AO) 
Styracaster horridus . 4 ‘ salliscee | G2eo: il secsealtaetent| ace 2350 
Styracaster armatus . - : ; 3 {!500. |! cao Hh cco |) SPN Goo |!) cod |] IO) 
Hyphalaster hyalinus 5 5 5 Boca ladon! Godel! cosa cecil ae |ePadsto) 
Hyphalaster diadematus . é F aiel|l zener tl zoctexs | ereeee a Nterme | ett eee TO) 
Hyphalaster inermis | : : Bill |Woasetleoom Nidec | sur lls ono Iliecan: ll ikea 
Hyphalaster planus . ; 6 é oi eee | abae lnoe dh Se) I heGag all cen ll dS BKO) 
Thoracaster cylindratus . , B een toto clbusce: ieee ctl sae | 2YXOLG) 
EN i enh ln 
