|.,S 



XX— XI V rarely over XL . arms 2;, mm. to 50 mm. long 

 trom the Red Sea to Madagascar and Mauritius, 



stward to northern Australia and the Easl lndi< 

 and northward t«> southern Japan; o 106 Metres Dorometra 



with 16 — 33 cirrus segments; cirri more numerous, 

 XXXV— LX (rarely less than XL- arms 75 mm to 80 mm. 

 long Lesser Sunda Islands to the Philippines; 69 — 140 



Metres) Eumetra 



1 not much the longest and stoutest pinnule on the arm 

 d 1 1' , P, and 1' similar and of approximately equal length, with at 

 least 1 .; segments 



e 1 1' . I' and I' longer than the genital pinnules; the pinnules are 

 m>t especially stiffened, and thëir component segments do not 

 bear prominent spines on the distal edges; the centrodorsal is 

 low hemispherical (Philippine Islands to southern Japan; 



2 3 — I9 o | -v Metres) Iridometra 



e 5 P,, P, and P. shorter than the genital pinnules: all the pinnules 

 slender and stilï, especially the lower which .are thorn-like, with 

 long spines on the distal edges of the segments; the centro- 

 dorsal is large, rounded conical (coast of Brazil; 41 Metres) Hybometra 

 cl- P a much longer than P, , and longer than P s , though similar to 

 the latter : centrodorsal more or less sharply conical (Andaman 

 Islands to southern Japan; 54 — 201 [?25o] Metres) . . Andrometra 



Mastigometra A. II. Clark. 



Key to the Species of the Genus Mastigometra. 



Distal cirrus segments from one third to one half again as long as broad; 

 arnv^ from 105 mm. to [20 mm. long;'cirri XXXV — LXXX, 12 — 16, 1 2 mm. 

 to 14 mm. long 



P, 25 mm. long with 41 ents; I', 16 mm. long with 35 segments; 



1' [O mm. to 12 mm. long w ith 25 segments (locality unknown). . flagellifera 

 \, P, [5 mm. Ion- with 30 segments; P s 10 mm. long with 24 segments; 



1' 7 mm. long with 13—15 segments (Tahiti; littoral) pacifica 



ind following cirrus segments ahout as long as broad; cirri L — XC, 16, 

 in mm. long: arms probably about 80 mm. Ion- (Ceylon; 0—47 



micropoda 



1. Mastigometra flagellifera .V II. 1 lark. 



A. II. Cl vi . Riol. Soc Washington, vol. 21. [908, p. 229 {Mastigometra flagellifera) 



