82 HI 1.1. KI IN S2, I Ml KI> STATES NATIONAL MUSEUM 



KEY TO THE SPECIES IN THE GENUS ZVGOMETRA 



n' . More than -to cirrus segments; more than 35 (usually 40 or more) arms. 



6'. Mon- than 10 (66-100] arms allj or most, of the IIIBr and following division series 4(3 + 4); 

 usually 46-56 cirrus segments; proximal pinnules very stout and very long (20-32 mm.), 

 tapering to a slender and flagellate tip; cirri very long and stout (Aru Islands and northern 

 Australia south to Shark Hay, Western Australia, and Port Curtis, Queensland; 0-128 



|? 135] meters) --- - - microdiscus (p. 82) 



M. About 40 (usually 35-45) arms; most of the IIIBr and following division series 2; usually 35- 



45 cirrus segments; proximal pinnules of moderate length (14-18 mm.) and not especially 



it; cirri net especially long or stout (northern Australia south to between Fremantle 



and Geraldton, Western Australia, and Sandon Bluffs, New South Wales; Amboina; 0-89 



meters) elegans (p. 98) 



a'. Less than 40 cirrus segments; less than 40 arms. 



6'. More than 10 arms; syzygy between the elements of the IBr series perfect. 

 r 1 . Cirri moderately long, with usually 25-30 segments; usually 25-35 arms. 



d'. Distal edges of radials and proximal and distal borders of the elements of the division 

 series and first 2 brachials plain and unmodified (Mergui Archipelago to Lesser Sunda 

 [stands, Holothuria Bank, the Moluccas, Salawatti, Philippines, and Hongkong; 0-73 



meters) -- comata (p. 110) 



<P. Distal edges of radials, proximal and distal borders of the elements of the division series. 

 and to a lesser extent the proximal and distal ends of the first 2 brachials thickened and 

 everted, this evcrsion being finely scalloped or tubcrcuIated(?Ceylon)_andromeda (p. 110) 

 <?. Cirri short and rather stout, strongly recurved in distal half, with not more than 21 segments; 

 not more than 21 arms (Aru Islands and northern Australia, south to Port Curtis, Queens- 

 land; 0-50 meters) punctata (p. 120) 



V. Only 10 arms; syzygy between the elements of the IBr series imperfect, the radiating ridges 

 being developed only on peripheral half of joint faces; arms 50 mm. long; cirri XII, 20-21, 

 12 mm. long (Philippines; 33 meters) pristina (p. 123) 



ZTGOMETRA MICRODISCUS (Bell) 



Plate 1, Figures 1, 2; Plate 2, Figures 3, 4, 6 



(See also vol. 1, pt. 1, fig. 332 (cirrus), p. 283; pt. 2, fig. 136 (arm base), p. 79; pi. 13, figs. 1045. 1052 

 (pinnules); pi. 14, fig. 1060 (pinnule) ; pi. 25, figs. 1155-1157 (disk).] 



Ihjponome sarsi Loves, Forh. Skand. Naturf. Mtfde Christiania, July 1868 (1869), p. liv (descrip- 

 tion and affinities; Cape York, Torres Strait); Ofv. Vet.-Akad. Forh., 1869, pp. 729-731; Compt. 

 Rend Lead. Sci. ml. 69, Sept. 1869, pp. 711, 712.— Billings, Can. Nat., new ser., vol. 4, 1869, 

 p. 270.— Loves, Can. Nat., new ser., vol. 4, 1869, p. 265 (detailed description; Cape York); 

 Ann. Mag. Nat. Hist., ser. 4, vol.4, 1869, p. 159. — Lutken, Vid. Medd. Naturh. Foren. K*b- 

 enhavn, 1869, pp. 184, 185, 186, footnote (discussion) ; Can. Nat., new ser., vol. 4, 1S69, p. 267 — 

 Wyvili.e Thomson, Proc. Roy. Soc. Edinburgh, vol. 7, 1872, p. 417. — P. H. Carpenter, Proc. 

 Roy. Soc, vol. 28, 1879, p. 388. — de Loriol, Pateontologie francaise, Terraine jurassiques, vol. 

 II, pt. 2, 1SS9, p. 436.— Gislen, Zool. Bidrag Uppsala, vol. 9, 1924, p. 271 (food). 



Hyponome sarsii Lovfs, Amer. Journ. Sci., ser. 2, vol. 48, 1869, p. 429.— Wtville Thomson, Proc. 

 Roy. Soc. Edinburgh, vol. 7, 1871, p. 417.— Schluter, Zeitschr. deutschen geol. Ges., vol. 30, 

 Heft 1, 1S7S, p . 29.— Perrier, Compt. Rend. Acad., Sci., vol. 96, 18S3, p. 450; Ann. Mag. Nat. 

 Hist , ser. ■"., vol. 11, 1883, p. 223.— P. H. Carpenter, Ann. Mag. Nat. Hist., ser. 5, vol. 11, 

 188 Proc. Roy. Soc. Edinburgh, vol. 12, 1884, p. 369. — Lockinoton, Standard Nat. 



"'-' • vol 1, 1SS4, p. 140.— P. H. Carpenter, Challenger Reports, Zoology, vol. 11, pt. 32, 

 1884, pp. t',7. s:., I ..... vol. 26, pt. 60, 1SS8, p. 97 (identity); Journ. Linn. Soc. (Zool.), vol. 24, 

 1891, i ity).— Hartlaub, Nova \<-ta Acad. German., vol. 58, No. 1, 1891, p. 25.— 



NhvMM, Riv. It:.] Sci. Nat., ann. 11, 1891, fasc. 2, p. 6.— A. H. Clark, Smithsonian Misc. 

 Coll., vol. 50, L907, p. 348 (identity); Mem. Australian Mus., vol. 4, 1911, p. 761 (same); 

 Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 1 (history; identity), p. 11 (specific identity) ; 



