1 entrodorsal shorter, not longer than broad, usually conical, sharply pointed 

 with straight sides 



I air columns of cirrus sockets in each radial area 



cirrus sockets ver) clos owded against each other; the twenty columi 



of cirrus sockets are closely crowded all around the centrodorsal, excepting 

 only where the downward i oi the basal rays separates the mosl 



proximal sockets of the outermost columns of each radial area Hawaiian 



Islands; 720 900 Metres) congesta 



cirrus sockets widel) separated from each other, arranged in four, with 

 metimes a partial fifth, columns in each radial area; narrow interradial 

 lines divide the sides of the centrodorsal into five radial regions, tip of 

 the centrodorsal truncated instead of sharply rounded as in the preceding 

 Galapagos Islands and Panama; 693 — 000 Metres) .... bigradata 

 nut more than thi umns <<( cirrus sockets in each radial area 



c 1 size large; arms probably between 130 mm. and 150 mm. long; centro- 

 dorsal large, a broadly truncated cone, with three complete and equal, 

 ry closely placed, columns of tour or live (usually four) cirrus sockets 

 in each radial area; relatively broad interradial lines, nearly as broad as 

 the adjacent cirrus sockets, delimit the radial areas; \\, though similar 

 to the succeeding pinnules, is longer and slightly stouter basally; the 

 cirri are about 50 mm. long, composed of 35 — 40 segments (northern 



part <>f the Sea of Japan; 702 — 731 Metres) erythrizon 



r, the arms not over 100 m.m. long; centrodorsal a sharply pointed 

 cone or a low hemisphere, never a broadly truncated cone; cirrus sockets 

 arr in two columns in each radial area. or in two columns with a 



partial median column 



d 1 cirrus sockets in two entire columns and one short and incomplete 



column in each radial area of the centrodorsal, the incomplete column 



between the two entire columns, which meet bevond it 



e 1 larger, the centrodorsal being from 4 mm. to 5.5 mm. broad at the 



base and from 4 mm. to 5 mm. high, sharply conical; cirrus sockets 



very definite in arrangement, tin- interradial furrows very regular, 



broad. and well marked 



f' the incomplete median column of cirrus sockets consists of two 

 sockets. with occasionally a more or less developed third; the. 

 radial areas are delimited by deep grooves which are about as 

 wide as the adjacent cirrus sockets; the centrodorsal is 5.5 mm. 

 broad at the base. and measures 5 mm. along the sides (An- 

 daman Sea to the Postillon Islands, north of Sum- 



bawa; .; ,1 Metres) major 



i the incomplete median column of cirrus sockets consists of a 



