180 



Not known 



above 

 500 fms. 



400 fins. 

 250 fms. 



100 fms. 



DISTRIBUTION OF BRITISH ECHINOBERMS. 



Number 

 of Species. 

 Stichopus tizardi, Zoroaster fulyens, Astropecten spheno- 

 plax 3 



Odinia pandina, Ophiopus arcticus 2 



Rhegaster murrayi, Brisinga coronata, Ophiura sarsi, O. 

 signata, Ophiobyrsa hystricis, Ophiomyxa serpentaria, 

 Phormosoma uranus 7 



Plutonaster bifrons, Pontaster pareli, Nymphaster subspi- 

 nosus, Corethraster hispidus, Brisinga endecacnemos, 

 Ophiomusium lymani, Ophioscolex glacialis 7 



We see, then, that of the 126 species as to whose bathy metrical 

 distribution we have some information, 



3 occur at or below the 1000 fm. line. 

 5 others 



3 



2 



7 

 7 



■>■) 



On the other hand, 



18 extend beyond the 1000 fm. line. 



9 

 28 

 22 

 4 

 5 

 6 

 7 

 4 

 3 

 3 

 3 

 1 

 5 

 2 

 3 

 2 

 1 



to the 



1 000 



ii 

 i) 



5> 

 5> 

 11 

 11 

 )5 

 i» 

 11 

 ?J 

 11 

 15 

 11 

 11 

 11 



5> 

 11 

 11 

 11 

 11 

 55 

 11 

 55 

 55 

 55 

 55 

 55 

 55 

 55 

 55 

 55 



Of the six as to which we have no definite information, we may 

 suppose that none were dredged from more than 100 fms. 

 Limiting ourselves, however, to the 126, we note: — 



(1) Only 13 are limited by the 50 fm. line. 



(2) Only 27 „ „ 100 



(3) While 22 reach the 500 



(4) And 28 „ 750 



