164 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Some numerical details of three of the specimens of austini are included in table 4, 

 on p. 159. 



The geographical limits of this subspecies cannot be determined without an ex- 

 amination of material from the west coast of Australia. Possibly all the specimens 

 recorded as incommoda by Dr. H. L. Clark from Western Australia are referable to 

 austini, the Great Australian Bight forming the dividing line between the subspecies. 



Locality. Lewis Island, Dampier Archipelago, northwest Australia [A. H. Clark, 

 1911, 1913] (11, B.M.). 



ANTEDON SERRATA A. H. Clark* 



FIGURE 11, a, 5 

 [See also vol. 1, pt. 1, fig. 373 (p. 299); pt. 2, figs. 296 (p. 221, 335) (p. 227, and 342) (p. 229)] 



Antedon serrala A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 353 (listed; nomen 

 nudum); Bull. Mus. Comp. Zool., vol. 51, No. 8, 1908, p. 240, pi. 1, fig. 4 (description; Tokyo 

 Bay, 8-12 fms.) ; Crinoids of the Indian Ocean, 1912, p. 229, footnote (of O'rsted, MS. = Stylo- 

 metra spinifera). 



Compsometra serrata A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 131 (listed) ; Proc. 

 U.S. Nat. Mus., vol. 34, 1908, p. 316 (Tokyo Bay, 8-12 fms.; cotype); Vid. Medd. Nat. Foren. 

 K0benhavn, 1909, p. 192 (Formosa Channel, 35 fms.); Notes Leyden Mus., vol. 34, 1912, pp. 

 131, 132 (compared with C. iris); Crinoids of the Indian Ocean, 1912, p. 229 (synonymy; For- 

 mosa to southern Japan; 8-35 fms.); Proc. Biol. Soc. Washington, vol. 26, 1913, p. 179 (range); 

 Journ. Washington Acad. Sci., vol. 5, 1915, No. 6, p. 215 (range and its significance) ; Unstalked 

 crinoids of the Sz'bopo-Exped., 1918, p. ix (relationship with C. iris), p. 205 (in key; range), 

 p. 209 (references). MORTENSEN, Studies in the development of crinoids, 1920, pp. 13, 16, 22 

 (development compared with that of Tropiomelra) , pp. 23-30 (embryology), p. 64 (discussion 

 of the embryology), text-figs. 5, 6, pis. 11-13. GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, 

 ser. 4, vol. 5, No. 6, 1922, pp. 5, 126 (localities; notes); figs. 105-108, p. 122; Zool. Bidrag Uppsala, 

 vol. 9, 1924, p. 28, footnote 1, p. 82 (syzygial faces), p. 194 (larva), p. 223 (gonads), fig. 83, p. 81; 

 Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 3 (stations 1, 3, 10, 22, 23, 25; 0-180 meters), 

 p. 43 (stations; notes), pp. 68, 69. A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, 1929, p. 658 

 (locality). CHANG, Contr. Inst. Zool. Nat. Acad. Peiping, vol. 4, 1948, p. 34 (listed), pp. 88-90 

 (references; description; type locality), p. 91 (bathy metrical range), fig. 24, pi. 9, figs. 7-9. 

 HTMAN, The invertebrates, vol. 4, Echinodermata, 1955, p. 87 (doliolaria larva). 



Iridometra serrata A. H. CLARK, Proc. U.S. Nat. Mus., vol. 34, 1908, p. 219 (compared with I. [Argyro- 

 melra] crispa). 



Diagnostic features. The arms are up to 70 mm. long; in the largest specimens 

 the cirri are about one-eighth as long as the arms but in the smaller ones may be up to 

 a quarter as long; the cirri are XX-LVwhen the arms exceed 20 mm., with up to 16, 

 usually 13 or 14 segments, of which the longest are about twice as long as their median 

 widths and the antepenultimate is about half again as long as wide; P! has 12 to 28 

 segments; P 2 is about half as long as PI or even shorter; P 3 is slightly larger than P 2 

 and bears a gonad; the brachials may be prominently spinous as well as the pinnule 

 segments; the centrodorsal is flattened hemispherical. 



Description. The centrodorsal is low-hemispherical. 



The cirri are about XXX, 11-14, from 7 to 8 mm. long. The longest segments 

 are about twice as long as their median widths. Those in the proximal half of the 

 cirri are more or less constricted centrally. The opposing spine is minute. 



See also Addenda (p. 838) under 1965. 



