310 



BR. P. H. CARPENTER ON TIIE 



S. gracilis, as I have explained elsewhere*; and I am inclined to 

 regard these last-mentioned species as the ancestral forms of the 

 existing members of the JElegans- group. On the other hand, 

 Antedon scrobiculata and A. aspera, with a bifascial articulation 

 between the two outer radials, w ere the Jurassic representatives 

 of the majority of the recent species of Antedon, in which the 

 two outer radials are also united by a bifascial joint. 



Antedon Milberti f , Mull, sp. (Plate XXVII. figs. 6, 7.) 

 Specific Formula. A. 



1888. Antedon Milberti, Carpenter, Zool. 'Chall' Exp. part lx. p. 194, 

 pi. xxxv. figs. 4-6. 



A dozen examples of this widely distributed species were ob- 

 tained at King Island, half of them from mud-flats exposed at 

 spring-tide. They are mostly of a light reddish-brown colour, 

 but one is more yellowish brown, and another is almost white. 

 Most of the larger specimens have the bases of the rays some- 

 what flattened laterally, as is often the case in this species, and 

 there is a good deal of variation in the relative sizes of the lower 

 pinnules. The fourth pinnule on the side is sometimes consi- 

 derably shorter than the third, and sometimes nearly equal to it 

 (PL XXVII. figs. 6, 7). 



This species is infested by a Myzostoma, which will be described 

 by Professor von Grraff. 



Antedon spicata, Carpenter. (Plate XXVII. figs. 3-5.) 



he 



Specific Formula. A. 2. 2. (2). t • 



1881. Antedon spicata, Carpenter, Notes from the Ley den Museum,, 1881, 

 vol. iii. p. 190. 



A single individual, which I take to belong to this species, 

 occurred at King Island (.sublittoral). But it has rather more 

 cirri than tho type specimen at Lcyden^ and in this respect ap- 

 proaches the allied species Antedon indica and A. tuberculata, 

 which resemble it in having long and still* pinnules on the fourth 

 and fifth brachials. In A. indica, however, the first pinnule is 

 much smaller than the large second one, as is well shown in 

 Smith's figure J, w hile in A. spicata it may nearly equal its suc- 



* Ann. k Mag. Nat. Hist. 1887, Her. 5, vol. xix. pp. 83-87. 

 t The bibliography of this species will be found in the ' Challenger ' Report. 

 \ Zoology of Rodriguez, Eohinodcrmata : Phil. Trans. 1870, vol. clxviii. pi. li. 

 fif. .'}//. 



