49 
b- outer cirrus segments always with more or less developed dorsal processes, 
and much shorter than the proximal; less than 60 arms 
c' cirri very lars^e and stout, long, numerous, composed of more than 32 
segments; centrodorsal large, more or less hemispherical, with a relatively 
small concave dorsal pole; usually about 40 arms, with all the division 
series 4 (3 + 4); size medium or larj^e, the arm length being between 
100 mm. and 200 mm. (commonly between 150 mm. and 200 mm.) 
d' division series broad, so that only small perisomic areas are visible in 
dorsal view, and comparatively flat (southernjapan) pins^uis 
d- division series narrow and strongly convex, exposing broad areas of 
perisome (southern Japan and southward to Hong Kong) . japonica 
c- cirri composed of fewer than 30 (usually fewer than 25) segments, short, 
or, if elongated, slender; centrodorsal with a broad flat dorsal pole; 
13—35 arms 
d' 18 — 30 cirrus segments 
e' cirri all or mostly more or less undeveloped and very variable in 
size, composed of a very variable number of segments, though 
always with fewer than 30 and usually with fewer than 25; division 
series very broad, comparatively flat dorsally and in close apposition 
so that no perisome is visible in dorsal view; 20 — 44 arms (sou- 
thern Japan and southward to b'ormosa [Taiwan]) . . solaster 
€' cirri all or nearly all mature, the majority of approximately the 
same size; number of cirrus segments variable only within narrow 
limits; division series broad and more or less flattened dorsally, but 
always with more or less perisome visible between them ; 20 — 35 arms 
f^ cirri shorter and more slender, with about 20 segments; 20 — 35 
arms (sou thern Austral ia a n d Ta s ma nia) triclioptera 
I- cirri longer and slightly stouter, with 24 — 27 (usually 26 — 27) 
segments (New Zealand) benhami 
d- not more than 1 7 cirrus segments 
e' cirri, though small, strong and well developed, with the outer portion 
strongly recurved, distributed evenly about the periphery of the 
centrodorsal; usually all the division series 4 (3 + 4); ^3 — 21 arms 
f' slender and delicate, with 15 — 21 slender slowly tapering arms 
50 mm. to 70 mm. long (northern Australia to the Bay 
of Bengal, the Philippine Islands, the Caroline 
Islands, Tonga, Samoa, Fiji, and New Caledonia) . samoana 
f- stout and robu.st, with 13—21 (usually 16—20) short, stout and 
rapidly tapering arms usually about 60 mm. long (Cape of 
Good Hope) tcahidergii 
e^ cirri short, weak, and poorly developed, irregularly distributed about 
SIBOGA-F.XPEDITIE XLII ^. ' 
