49 

 i 

 b 3 outer cirrus segments always with more or less developed dorsal processes, 



and much shorter than the proximal; less than 60 arms 



c 1 cirri very large 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 -f- 4); size medium or large, the arm length being between 



100 mm. and 200 mm. (commonly between 150 mm. and 200 mm.) 



d 1 division series broad, so that only small perisomic areas are visible in 



dorsal view, and comparatively flat (southernjapan) pinguis 



d 3 division series narrow and strongly convex, exposing broad areas of 



perisome (sou'thern Japan and southward to Hong Kong) . japonica 



c 3 cirri composed of fewer than 30 (usually fewer than 25) segments, short, 



or, if elongated, slender; centrodorsal with a broad flat dorsal pole; 



r 3— 35 arms 



d 1 18 — -30 cirrus segments 



e 1 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 Formosa [Taiwan]) . . solastcr 

 e 3 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 

 t 1 cirri shorter and more slender, with about 20 segments; 20 — 35 



arms (southern Australia and Tasmania) triclioptera 



f 3 cirri longer and slightly stouter, with 24 — 27 (usually 26 — 27) 



segments (New Zealand) óen/iai/ü 



d 3 not more than 1 7 cirrus segments 



e 1 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 (34-4); 13 — 21 arms 



f 1 slender and delicate, with 15 — 21 slender slowly tapering arms 



50 mm. to 70 mm. long (northern Australia to the Bay 



of Bengal, the Philip pin e Islands, the Caroline 



Islands, Tonga, S.amoa, Fiji, and New Caledonia) . samoana 



f 3 stout and robust, with 13 — 21 (usually 16 — 20) short, stout and 



rapidly tapering arms usually about 60 mm. long (Cape of 



Good Hope) ' wahlbergii 



e 3 cirri short, weak, and poorly developed, irregularly distributed about 



S1BOGA-EXPEDITIE XLII 6. 7 



