107 



A. H. Clark. Smithsonian Miscellaneous Collections, vol. 60, 19 12, N" io, p. 22. 



Proc. U.S. Nat. Mus., vol. 43, 1912, p. 398. 



Proc. Biol. Soc. Washington, vol. 26, 191 3, p. 181. 



Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 30. 



Stat. 43. Anchorage off Pulu Sarassa, Postillon Islands. Up to 36 Metres. 1 Ex. 

 Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 1 Ex. 

 Stat. 213. Saleyer. 1 Ex. 

 Stat. 250. Anchorage off Kilsuin, western coast of Kur Island. 27 Metres. 1 Ex. 



The specimen from Stat. 43 has the cirri XXI, 27 — 28, 20 mm. to 21 mm. long; the 

 longest segments are about one third again as long as broad; the short distal segments are 

 only slightly broader than long; dorsal spines, which are somewhat smaller than in specimens 

 at hand from Singapore, are developed from the eighth or ninth onward. The 14 arms are 

 115 mm. long; only one (external) IIIBr series is present. P 1 is 8 mm. long with 28 segments. 

 P 2 is 11.5 mm. long with 27 segments. P„ is 15 mm. to 17.5 mm. long with 30 — 38 segments. 

 P i is 9 mm. long with 20 segments on arms arising from a IIBr axillary, and 12.5 mm. long 

 with 27 segments on arms arising from a IIIBr axillary; in the latter case it resembles P.,. 

 The colour is deep purple. 



The individual from Stat. 144 has 18 arms 90 mm. long; the longest cirri are 16 mm. 

 long with 22 — 24 segments, of which the ninth or tenth and following bear dorsal spines. 



The example from Stat. 250 has 20 arms 115 mm. long, all of the IIBr series being 

 present; the cirri are XXIV, 24 — 25, 18 mm. long; dorsal spines are developed from the tenth 

 or eleventh segments. P, is 4.5 mm. to 6.0 mm. long. P 3 is 7.5 mm. to 9.5 mm. long with 

 25 segments. P 3 is 9.0 mm. to 11.5 mm. long with 21 segments. P t is 6.0 mm. to 6.5 mm. 

 long with 16 segments. The colour is whitish with broad, frequent and regular bands of purple 

 on the arms which become more closely crowded distally so that the outer portion of the arms 

 is purple with narrow white bands. 



The large specimen from Saleyer has 40 arms about 100 mm. long, and cirri XXII, 

 29 — 30, 27~mm. long. It agrees very well with the type at Leyden. 



Mariametra A. H. Clark. 



Key to the Species of the Genus Mariametra. 



a 1 Distal cirrus segments much broader than long, bearing long and sharp 

 dorsal spines 



b 1 less than 28 arms; radials and sides of the ossicles of the division series 

 covered with very prominent irregular tubercles or short spines which 

 extend dorsalward at the articulations where they may form narrow 

 bands across the ends of the segments ; ossicles of the division series 

 with a prominent irregular median keel or meclian row of tubercles 

 which becomes less marked on the IIBr series and is absent beyond 

 the arm bases; division series and arms with a prominent purple median 



