gracillima 



single socket; the radial areas are delimited by slightly sunken 



bare areas fróm half to quite as wide as the adjacent sockets; 



the centrodorsal is 4 mm. broad at the base and 4 mm. high 



(Postillon Islands to the Andamans, and northward 



to the Gulf of Martaban; 338 — 794 Metres) .... mira 



e 2 smaller, the centrodorsal being not more than 3.2 mm. in basal 



diameter, rounded conical; the cirrus sockets are less definitely arranged 



f 1 interradial furrows on the centrodorsal broad and distinct, from 



as wide as the adjacent cirrus sockets to as wide as the entire 



cirrus bearing portion of the radial areas; cirrus sockets very 



irregular in arrangement, but usually in two columns with addi- 



tional sockets toward the proximal border of the centrodorsal ; 



very slender; arms about 100 mm. long; cirri XL — L, 25, 



35 mm. long (southwest of Akyab, Burma; 489 Metres) 



f- interradial furrows on the centrodorsal narrow and more or less 



obscure; cirrus sockets less irregular in arrangement, 7 — 9 in 



each radial area; centrodorsal very low, with rounded sides 



(Sumbawa to Ceram; 521 — 835 Metres) inusitata 



d~ cirrus sockets in two columns of from two to four each in each radial 

 area; centrodorsal low, conical, with the tip slightly rounded 

 e 1 cirrus sockets regularly arranged 



f 1 the ten columns of cirrus sockets of 2 (rarely 3) each are closely 

 crowded, without segregation into radial pairs; arms about 80 mm. 

 long; cirri XX, 26 — 31, 30 mm. to 45 mm. long (Antarctic 



regio ns, near Gaussberg; 2725 Metres) antarctica 



f 2 the ten columns of cirrus sockets are segragated into five pairs 

 which are separated by bare interradial spaces 

 g 1 radial areas. delimited by narrow irregular lines; 20 large 

 cirrus sockets, four in each radial area, in two closely crowded 

 columns; centrodorsal rounded conical, 1.7 mm. in diameter 

 at the base, and about 1 mm. from the apex to the inter- 

 radial border; P, bears a gonad (near Saleyer, south of 



Celebes;ii58Metres) anomala 



g 2 radial areas delimited by prominent bare interradial spaces 



from half as wide as to as wide as the adjacent sockets 



h 1 larger, the centrodorsal measuring 3.2 mm. across the base 



and 4 mm. from the apex to the interradial margin; bare 



interradial areas very regular, about as wide as the adjacent 



sockets; three or four cirrus sockets in each column (Phi- 



lippine Islands; 759 Metres) parva 



h 2 smaller, the centrodorsal measuring 1.8 mm. across the base 



SIBOGA-EXPEDITIE yAA\b. . 29 



