§3 



d 1 28 — 50 (usually about 40) cirrus segments; arms 115 mm. to 300 mm. 

 long; the dorsal spines on the outer cirrus segments appear in lateral 

 view as broad triangles with the apex produced and subterminal 

 instead of small sharp median spines as in spe c tab il is and mol Ier i 

 (Sunda Islands and Moluccas southward to bet ween 

 Fremantle and Geraldton, Western Australia) . . . jacquinoti 

 d 3 25 cirrus segments, of which the outer bear long and sharp dorsal 

 spines; arms about 60 mm. long; P, with 12 thick segments, larger 

 and much stouter than P x or P 8 , which are subequal, though the 

 latter is stouter basally (Northwestern Australia and New 



Guinea) ■ pinniformis 



c 2 cirri more slender, tapering more or less distally, the longer proximal 

 segments about as long as broad, sometimes slightly longer than broad, 

 more rarely slightly broader than long 



d 1 usually 40 — 50 (32 — 51) cirrus segments which bear small dorsal 

 spines from about the i8 th onward ; arms usually about 130 mm. long; 

 synarthrial tubercles usually promjnent, though not excessively deve- 

 loped, and pointed (northern and eastern Australia to 

 Singapore, Formosa, and the Philippine Islands) . . discoidea 

 d 3 not over 35 cirrus segments; arms not over 120 mm., usually not 

 over 100 mm., in length 

 e 1 synarthrial tubercles very high, extravagantly developed; 30 cirrus 



segments; arms 80 mm. long (Singapore) ensifer 



e 2 synarthrial tubercles slightly, or not at all developed 



'f 1 dorsal spines on the outer cirrus segments small or medium in 



length (Canton, China, tosouthern Japan) . . . laevipinna 



f 2 dorsal spines on the outer cirrus segments long and conspicuous 



(New Guinea to Tonga and Fiji) papuensis 



1. Amphimetra spectabilis A. H. Clark. 



A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 190S, part 2, 



p. 215 (Himerometra milder ti). 



Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 [Amphimetra milberti, part). 



Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 156 (the species 



referred to under the name of Amphimetra milberti in the discussion of A. mollen). 



Proc. U. S. National Museum, vol. 39, 1911, p. 540 (Amphimetra milberti). 



Crinoids of the Indian Ocean, 1912, p. 111 (Amphimetra milberti, part). 



Localities. — Only known from the Philippine Islands; "Albatross" Stat. 5100, South 

 Channel, Manila Bay, 35 fathoms (Cat. N° 35245, U. S. National Museum); and Limbones 

 Cove ("Albatross" Coll.; Cat. N° 35196 U. S. National Museum). 



