EEPORT ON THE CRINOIDEA. 235 



Each of the two examples of Antedon conjungens which are described above has 

 normally eight arms to the ray, but a palmar axillary is occasionally absent ; while in the 

 D ray of each individual post-palmars are developed, one axillary in the one, and two in 

 the other specimen. 



For the present therefore the formula of the type must be A. 2. 2. 2.-^-, though it is 



quite likely that examples of it will be eventually discovered in which post-palmars are 

 absent, so that the last figure must then be put within brackets. 



7. Antedon sirnilis, n. sp. (PI. XLVII. figs. 1-3). 



be 

 S}dccific formula — A.2.2.y. 



Description of an Individual. — Centro-dorsal a thick disk, bearing about forty 

 marginal cirri. These have some twenty-five tolerably uniform joints, the later ones 

 compressed, with a sharpened dorsal edge which passes into the penultimate spine. 



The first radials are entirely concealed, and also part of the second, which are 

 closely united laterally. Distichals are present all round the calyx, and palmars on 

 four of the rays, the two outer secondary arms bearing palmar axillaries, so as to give 

 six arms to the ray, viz., 2.1.1.2. Each series is of two joints, the axillary without 

 a syzygy. The distichals and palmars of adjacent rays are closely appressed, with sharp 

 lateral edges and flattened sides. Twenty-eight long and slender arms of about one 

 hundred and fifty joints, the lower ones discoidal and the rest shortly triangular. 

 gradually becoming cruadrate, but always much wider than long. A syzygy in the third 

 brachial, and the next between the sixteenth and twenty-first, with others at intervals 

 of eight to sixteen joints. 



The first pinnule is some 7 mm. long, with about twenty joints, which are but little 

 longer than wide. The second is much stouter, consisting of nearly twenty -five rather 

 longer joints, and reaching 14 mm. The fifth brachial has a similar but rather smaller 

 pinnule, and that on the sixth is 6 mm. long with nearly twenty joints. The fourth 

 pinnule is but little shorter, with a dozen joints. 



Disk naked and rather incised ; sacculi abundant on the pinnule-ambulacra. 



Colour in spirit, — a mixture of brownish-white and greenish -grey. 



Disk 12 mm.; spread 16 cm. 



Locality. — Station 174 l (b, c, or d), August 3, 1874; near Kandavu, Fiji; lat. 

 (about) 19° 6' S., long, (about) 178° 18' E.; 255, 610, or 210 fathoms; coral mud; 

 bottom temperature (at 610 fathoms), 39° F. One specimen. 



Remarks. — This species stands very close to Antedon brevicuneata, which was 

 brought from Amboina to the Leyden Museum, and it is with some hesitation that I 



1 The exact locality, and consequently the exact depth, is not recorded. 



