REPORT ON THE CRINOIDEA. 205 



the lower pinnules, give it a certain amount of similarity to Antedon rosacea and 

 Antedon diibeni (PI. XXXVII. figs. 1, 2). But it resembles Antedon carinata in the 

 large size and the tolerable equality of the pinnules on the sixth and following brachials 

 (PI. XXXVI. fig. 8), a point which distinguishes it altogether from Antedon rosacea and 

 Antedon diibeni, in which the first pinnule is the longest (PL XXXVII. fig. 3). The 

 small number of cirrus-joints separates it from Antedon anceps and Antedon variipenna, 

 which somewhat resemble it in the characters of the pinnules (PL XXXV. figs. 1-3 ; 

 PL XXXVI. figs. 1, 4-6). 



6. Antedon informis, n. sp. (PL XXXIII. fig. 3). 

 Spec ific formula — A. -r . 



Description of an Individual. — Centro-dorsal discoidal, with a smooth dorsal surface 

 and about a dozen marginal cirri. These have fifteen to eighteen joints which are as 

 wide or wider than long, most of them with a slight elevation in the middle of the dorsal 

 edge ; the penultimate with a faint spine. 



First radials partially visible ; the second oblong, with a rounded dorsal surface, and 

 but slightly united laterally. Axillaries also rounded, short, and widely rhombic. Ten 

 arms ; the first few brachials nearly oblong ; the following ones rather wider than long, 

 somewhat overlapping, and almost triangular, gradually becoming oblicpiely quadrate. A 

 syzygy in the third brachial, and the next usually about the eleventh or twelfth, with 

 others at intervals of three to five joints. 



The second brachial bears a comparatively small pinnule of about a dozen squarish 

 joints. There may be a similar but smaller one on the third brachial, or more generally 

 none at all. That on the fourth is considerably longer and stouter, but the following- 

 pinnules are smaller again. 



Disk lost ; sacculi very abundant on both arms and pinnules. 



Colour in spirit, — white. 



Spread perhaps 8 cm. 



Locality.— Station 208, January 17, 1875; lat. 11° 37' K, long. 123° 31' E.; 

 1 S fathoms ; blue mud. One imperfect specimen. 



Remarks. — Of the five mature arms which remain in this much mutilated individual, 

 only one, the central one in the figure (PL XXXIII. fig. 3), has a pinnule on the third 

 brachial, and that but a small one. In the other four arms it is entirely absent, and in 

 one ray which has been completely regenerated there are no pinnules on the third, fifth, 

 and seventh brachials, although those on the other (outer) side of the arm are all present 

 as usual. 



There is a similar absence of a pinnule on the third brachial in the unique specimen 



