276 



THE VOYAGE OF H.M.S. CHALLENGER. 



The northern and western boundaries of the Australian district encroach into tlie 

 Indo-African limits, while the eastern extension of the Australian district laps far into 

 the Pacific, or rather the whole of the Australian field seems to be cut out of the Indo- 

 Pacific realm.^ We find encroaching into the south-eastern limits abyssal species 

 from the extension of the Pacific abyssal fauna : Pliormosoma hoplacantha, Porocidaris 

 elegans, and PoxtrUdesia lagnncnla, while Prionechinns sagittiger is probably only an 

 abyssal species characteristic of the Indo-African realm. 



Of the littoral species already known, Temnoplexirus reynaudi, Hvpp)0^i-oe variegata, 

 Maretia planidata, and Brissopsis luzonica were found by the Challenger to extend far 

 into the Australian littoral district. 



Antarctic and Southern Ocean. 



DESMOSTICHA. Hseckel. 



CiDARIDiE, Miill. 



GoNiociDARiD^, Hceckel. 

 Goniocidaris, Des. 

 X G. carmliculata, A. Ag., 



Arbaciad^, Gray. 

 Arbacia, Gray. 

 X A dufresnii, Gray, . 



EcHiNlD^, Agass. 

 Triplechinid^, a. Ag. 

 Echinus, Eond. (Linn.) 

 xE. magellaniciiijVhil., . 



X E. numjaritaceus, Lam., 



PETALOSTICHA, Hteckel. 



SPATANGID.E, AgaSS 

 POURTALESI^, A. Ag. 



Pourtalesia, A. Ag. 

 *P. carinata, A. Ag., 

 *P. ceratopyya, A. Ag., . 

 *P. hispida, A. Ag., 

 X P. phiale, Wy. Thorn., . 



Spatagocystis, A. Ag. 

 *S. challetujeri, A. Ag., . 



Echinocrepis, A. Ag. 

 *E. cuneata, A. Ag., 



Range in Depth and Principal Localities. 



j X Station 147, 1600 fathom.?; x Station 149, 25 fathoms; xKerguelen, 

 / 20-150 fathoms. 



xNightingale Islands, 100-150 fathoms; xStation 151, 75 fathoms; 

 X Station 153, 1675 fathoms; >; Station 156, 1975 fathoms (South 

 America). 



xStation 145,150-310 fathoms; xStation 147, 1600 fathoms; ^Marion 



Island, 50 fathoms. 

 X Christmas Harbour, 50-120 fathoms; xStation 150, 150 fathoms; 



xStation 151, 75 fathoms. 



xStation 147, 1600 fathoms ; xStation 157, 1950 fathoms (South Pacific). 

 XStation 157, 1950 fathoms (South Pacific). 



X Station 147, 1600 fathoms ; xStation 156, 1975 fathoms (Southern Ocean). 

 xStation 156, 1975 fathoms (Atlantic). 



xStation 147, 1600 fathoms; xStation 157, 1950 fathoms. 

 XStation 147, 1600 fathoms. 



■>• A number of Indo-African species extending into the Australian realm and into the Chinese districts have been 

 added to the list, as no list of Indo-African species is given. 



