REPORT ON THE CRINOIDEA. 113 



First radials just visible ; the second radials and axillaries sharply convex and almost 

 carinate. The second are partly free laterally and but little incised by the hexagonal 

 axillaries, which are much wider than loug, with a more rounded dorsal surface, but only 

 slightly overlapping the distal angles of the second radials. Both joints, and also the 

 first brachials, have straight edges and flattened sides. The inner sides of the second and 

 the hypozygals of the third brachials are likewise slightly flattened. 



Ten arms ; the second brachials relatively short and oblong, not projecting much 

 backwards into the first, but both joints are sharply convex at their line of junction. 

 The next few joints are nearly square and the following ones obliquely quadrate, longer than 

 wide. The later joints overlap slightly and become somewhat sharply carinate. Syzygies 

 in the third and about the thirteenth brachials ; others at intervals of two or three joints. 



The first pinnule larger than the second. Its lower joints relatively stout, with some- 

 what flattened outer sides, and the inner edges of the third to the fifth joints slightly 

 carinate. The pinnules of the third and following brachials small and increasing slowly 

 in length, the later ones sometimes showing a faint expansion of the two basal joints. 



Disk much incised and well plated, and the brachial ambulacra slightly so. Pinnule- 

 ambulacra tolerably well defined, the side plates with intervening sacculi. 



Colour in spirit, — light brownish-white. 



Disk 4 mm.; spread probably about 9 cm. 



Locality. — Station 164, June 12, 1874; near Port Jackson; lat. 34° 8' S., long. 

 152° 0' E.; 950 fathoms; green mud; bottom temperature, 36 Q, 5 F. Five specimens, 

 two much mutilated. 



Remarks. — There are several points of resemblance between this species and the 

 younger forms of Antedon hreviradia, which show a tendency to carination of the two 

 outer radials (PL XL fig. 5 ; PL XX. fig. 1). But the radials differ considerably in their 

 other characters, while Antedon spinicirra has fewer cirrus-joints than the larger Antedon 

 hreviradia, with the basal ones relatively shorter and more spinous than in the latter 

 type. Another point of difference is afforded by the first pinnules, the lower joints of. 

 which are much less expanded and carinate in Antedon spinicirra than in equally 

 developed forms of either Antedon hreviradia or Antedon acutiradia. This last is 

 distinguished from both the preceding species by the great relative length of the radial 

 axillaries (PL XL fig. 3). 



8. Antedon acutiradia, n. sp. (PL XL figs. 3, 4). 



Specific formida — A. (~?j • 



Centro-dorsal hemispherical, bearing about fifteen cirri, which have the fourth and 

 some of the following joints much longer than wide, with traces of dorsal spines. 



(ZOOL. CHALL. EXP. PART LX. — 1887.) 0°° 13 



