ANTEDON. 55 



20 pis. & i. (1889) p. 171 ; Barrois, Rev. Biol. i. (1889) p. 33 ; 



Macmunn, Q. J. Micr. Sci. xxx. (1890) p. 51 (colouring-matter). 

 Alecto rosea, J. M tiller, Arch.f. Nat. 1841, p. 143. 

 Ganymeda pulcbella, Gray, P. Z. S. 1834, p. 15 ; id. Ann. 8f Mag. 



vL (1840) p. 158. 

 Astrophvton elizabethae, Mcintosh, Proc. Roy. Soc. Edin. 1865-6, 



p. 609, fig. 

 Antedon (Comatula, Larrik.) rosacea, Carpenter, Proc. Boy. Soc. 



1876, pp. 211 & 451. 

 Antedon europseus, Greef, SB. Ges. Marburg, 1876, p. 88. 

 Young Stage: Pentacrinus europaeus, J. V. Thompson, Memoir on 



the Pentacrinus europseus, 1827. 

 Anatomy and Development : Allman, Tr. R. Soc. Ed. xxiii. 



(1863) p. 241 ; Wtt, Thomson, Phil. Trans. 156. (1865) p. 513; 



W. B. Carpenter, Phil. Trans. 157. (1860) p. 671 ; id. Proc. Roy. 



Soc. Lond. xxiy. (1876) pp. 211 & 451 ; Greef, SB. Ges. Marburg, 



1876, p. 16 ; Ludwig, Zeit. f. w. Zool. xxyiii. (1877) p. 255 ; W. B. 



Carp. Proc. Roy. Soc. Lond. xxxvii. (1884) p. 67 ; Jickeli, Zool. 



Anz. vii. (1884) pp. 346, 366, 448 ; Marshall, Q. J. M. S. xxiy. 



(1884) p. 507 ; Perrier, Nouv. Arch. Mus. ix. (1886) p. 53 ; 



Barrois, Compt. Rend. cii. (1886) p. 1176; id. Rec. Zool. Suis. iy. 



(1888) p. 545. 



a 



As at present understood a very variable species. 



Cirri ranging in number from about twenty to nearly forty, never 

 as many as twenty joints, but ordinarily fifteen to eighteen. The 

 flattened central part of the disk generally bare. The radials 

 largely obscured by the cirri, and the first radials quite hidden by 

 the centrodorsal ; the second, much wider than long, cannot be 

 seen till the cirri are removed ; the axillary triangular with the 

 sharp apex pointing outwards. The first brachial twice as wide 

 without as within ; the third a syzygy. Succeeding syzygies on 

 eighth, twelfth, and then on every third or fourth. Number of 

 arm-joints about 150 in an arm 100 mm. long. The arms are 

 rather delicate and taper gradually to a very fine line ; but some 

 specimens are very much stouter, and the arm-joints are almost 

 knobbed. The proximal pinnule much the longest, with most of 

 its joints much longer than broad ; the number of component 

 joints varying between thirty-five and forty-five. The succeeding 

 pinnules not more or little more ihan one-half the length of the first. 



The larva pedunculated (" pentacrinoid stage ") and fixed. 



Colour very variable, rosy to deep purple, yellow, or orange, or 

 mottled and spotted. In spirit brownish or yellowish, or flesh- 

 coloured ; sometimes differently coloured in different parts : cirri 

 ordinarily much lighter. Dried, whitish. 



Length of arms 70 



Diameter of disk 7 



Length of 1st pinnule . . 15 



„ 4th „ . . 5 



Greatest length of cirri . . 10 



