188 THE VOYAGE OF H.M.S. CHALLENGER. 



The lowest pinnules seem to be tolerably equal in length, consisting of cylindrical 

 joints which are relatively longer in the second than in the first pair. 



Disk invisible ; pinnule-ambulacra naked, with abundant sacculi. 



Colour in spirit, — the skeleton straw-coloured, with the perisome brownish. 



Spread probably about 5 cm. 



Locality. — Station 214, February 10, 1875 ; off the Meangis Islands; lat. 4° 33' N., 

 long. 127° 6' E.; 500 fathoms; blue mud; bottom temperature, 4l°*8 F. 



Remarks. — This little species differs from the two last described in having much 

 shorter cirrus-joints (PI. XXX. figs. 3, 4, 8 ; PI. XXXI. fig. 6). The lower pinnules are 

 much broken, but they appear to have been tolerably equal in length, and the joints of 

 the first pinnule are relatively shorter and stouter than those of the second ; while in 

 Antedon tenuicirra the reverse is the case. There is a certain amount of resemblance 

 between Antedon Isevis and Antedon remota ; but the former species has relatively longer 

 axillaries than occur in Antedon remota, and also more numerous cirrus-joints, which do 

 not overlap as is the case in that species (PI. XXIX. figs. 5, 6). 



13. Antedon hirsuta, n. sp. (PI. XXXI. fig. 5). 



be 

 Specific formula — A.-^-. 



Description of an Individual. — Centro-dorsal conical, bearing about thirty-five cirri 

 in irregular vertical rows. The cirri have twenty-five to thirty joints, the lower ones 

 somewhat elongated and the later joints smaller, with slight dorsal keels. 



Three radials visible ; the first short, the second oblong, rather convex and but little 

 incised for the widely rhombic axillaries. Ten arms ; the first brachials nearly oblong, and 

 the second relatively short and wide, with a very open proximal angle. The next few joints 

 oblong, and the following ones elongately triangular, gradually becoming more quadrate 

 and finally cylindrical, with slight lateral projections for the pinnule facets. The distal 

 edge of each joint bears a small fringe of spines which projects forwards over the base of 

 its successor so as to give the arms a somewhat serrate appearance. Syzygies in the 

 third, and then in the sixth or eighth brachials, after which they are rather irregular, but 

 generally at intervals of two or three joints. 



The arms are mostly regenerated at the first syzygy ; but in the uninjured ones the 

 first two pinnules, which are stiff and tapering, consist of about twelve longish joints, and 

 appear to be tolerably equal, the first being perhaps a little the longer, and with stouter 

 joints, the lowest of which may be slightly flattened. The second pinnule has a genital 

 gland, and the following ones are at first shorter and more slender than those below them, 

 but have relatively longer joints, after which the length gradually increases. 



