Himerometra 



III Family Himerometridai A. II. Hark. 



Key to the Genera of the Family Himerometridae. 



.1 1' : ;i.-r than 1',, which in turn is longer and stouter than 



p § . division strongly rounded dorsally, widely separated; 



HlHr series on the outer side of each 1 1 1 "• r series 4 (3 + 4), on the inner 



side usually 2; large .m>l robust species witli from 20 to 65 (rarely less 



than 30) arms which are usually between 100 mm. and [50 mm. long 



Persian 1'. uit' to the Kei Islands, the Admiralty Islands, 



Mat hias I si and. the Philippines and C och in China) . 

 .1 1'p shorter and mort- slender than I',. which in turn is shorter and more 

 slender than 1' (in ten armed types P, is shorter and more slender than 

 1' . and the latter is shorter and more slender than I' 

 b 1 mort- than 10 arms 



c 1 cirri very slightly curved (nearly straight), gradually tapering to 

 a sharp point distally, the distal segments proportionately as 

 long as, or longer than, the proximal, twice as long as broad 

 or even longer, and entirely without dorsal processes; no opposing 

 spine; terminal claw long and nearly straight 



d 1 cirri very long and stout, the proximal portion light in 

 colour. each segment with a ventral purple saddle, the 

 distal portion dark brown, composed of 42 — 46 segments; 

 division series usually broad, well rounded dorsally, not in 

 lateral contact ; large and robust species with from 20 to 

 36 arms usually between 100 mm. and 130 mm. in length 

 B u r m a t o H o n g K o n g , and southward t o the 

 Andaman Islands and Sydney, Xew South Wales) Craspedometra 

 d a cirri small, very slender, entirely white in colour, composed 

 of 25 — 30 segments-, 10 or 1 1 arms from 70 mm. to 90 mm. 



in length (Arafura Sea; Moluccas) Homalometra 



c- cirri not especially long and not noticeably stout; the distal 



portion is more or less strongly recurved; the distal cirrus segments 



are always much shorter than the proximal, and usually bear 



iimre or less prominent dorsal spines, more rarely being simply 



carinate dorsally; the opposing spine is always well developed 



and prominent; the terminal claw is of moderate length or short, 



tngly rurved (east Africa from Madagascar and 



Bagamoyo to Suez, east war d to the Moluccas and 



lorthern Australia, and northward to southern Japan) Heterometra 



10 arms only 



