Si 



The arms vary from 10 to 13 (usually 11 — 13) in number, and are from 90 mm. to 



m. long. 



P T is 7.5 mm. long with 18 segments which, gradually increasing in length, become 

 about as long as broad on the fourth or fifth and Uvice as long as broad terminally ; the 

 second-eighth have a strong, though rounded, supplementary ridge (this not being indicated in 

 H. producta). P„ is 10.5 mm. long with 17 segments, slightly stouter basally than P,, but 

 tapering less gradually and composed of longer segments; the supplementary ridge occurs on 

 the second-ninth. P., is similar to P„, 9 mm. long. F± is 6 mm. long with 1 1 segments, a supple- 

 mentary ridge on the second-fourth or -fifth. P 3 and P : , are not stouter basally than the 

 succeedihg pinnules, but they taper with slightly less rapidity ; the distal angles of their component 

 segments are only slightly swollen and produced — about as in H. producta. The distal pinnules 

 are 10 mm. long, composed of 20 segments. 



The colour is brownish white, with occasional narrow bands of rusty on the arms; the 

 cirri are white. 



This species is most closely related to H. producta, but is even more slender and delicate. 

 The elongate distal cirrtis segments serve to distinguish it at once. 



The characters of the six specimens from Stat. 318 are included in the above description. 



One of those from Stat. 320 has 11 arms 120 mm. long, with one IIBr 4(3 +4) series; 

 the cirri are 30 mm. long with 33 segments. The other is smaller with 12 arms about 55 mm. 

 long, both the IIBr series being 2, and the cirri 20 mm. long. 



3. Heterometra quinduplicava (P. H. Carpenter). 



P. H. Carpenter. Quart. Journ. Geol. Soc., Feb. 1880, pp. 41 (footnote), 42, 43 {Antedon, 



sp., from Stat. 212). 

 u Challenger" Reports. Comatulae, 1888, p. 229, pi. 39, fig. 5 {Antedon clemens); p. 254, 



pi. 35, fïgs. 1 — 3 {Antedon anceps); p. 262, pi. 4, figs. ia — d; pi. 47, figs. 4, 5 {Antedon 



quinduplicava). 

 A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, 



p. 214 {Himerometra quinduplicava). 

 Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 {Amphimetra anceps); p. 11 {Hetero- 

 metra quinduplicava). 

 Vidensk. Medd. fra den naturhist. Forerring i K^benhavn, 1909, p. 162 {Heterometra 



q u in dup licava). 

 Crinoids of the Indian Ocean, 19 12, p. 120 (Craspedometra anceps, except reference to 



C. aiiena, which latter is H. creuulata); p. 130 {Heterometra quinduplicava). 

 Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 23 (Amphimetra anceps); 



p. 27 {Heterometra quinduplicava)-. 



Stat. 99. Anchorage off North Ubian. 16 — 23 Aletres. 1 Ex. 



The 26 arms are 80 mm. long; two of the arms arise directly from IBr axillaries; there 

 are eight IIBr series of 4 (3 -f 4) each of which bears internally a IIIBr series of 2. The cirri 

 are XVIII, 27 — 30, 22 mm. long. 



This resembles exactly a specimen dredged by the "Albatross" at Stat. 5139, near Joló 

 (Sulu), in 20 fathoms (Cat. N° 35183 U. S. National Museum). 



SIBOGA-EXPEDITIE XLII b. I I 



