EEPORT ON THE CRINOIDEA.. 185 



Ten arms, of smooth, obliquely quadrate joints. Syzygies in the third and eighth or 

 ninth brachials, and then at intervals of two to four joints. 



The first two pairs of pinnules long, slender and delicate, composed of several 

 elongated joints and tolerably equal in length. The two lower joints of the distal 

 pinnules are expanded and flattened. 



Disk and ambulacra naked ; sacculi abundant on the pinnules. 



Colour in spirit, — dirty white. 



Disk about 4 mm.; spread probably about 8 cm. 



Locality.— Station 147, December 30, 1873 ; lat. 46° 16' S., long. 48° 27' E.; 

 1600 fathoms ; Diatom ooze; bottom temperature, 34 0- 2 F. Four mutilated specimens 

 and fragments of a fifth. 



Remarks. — This species is readily distinguished from Antedon tenella and Antedon 

 rosacea and their allies by the characters of the lower pinnules, which are all long and 

 slender, but of tolerably equal size. They are much broken in all the specimens, and it 

 is difficult to determine either their length or the number of their component joints at 

 all exactly (PL XXIX. figs. 5, 7, 8) ; but the remains of them are quite sufficient to 

 show their difference from the lower pinnules of Antedon angustipinna and Antedon 

 abyssorum (PL XXIX. figs. 2, 11). There is no such enlargement of the joints of the 

 genital pinnules as occurs in the former species (PL XXIX. fig. 3), to which Antedon 

 remota has some resemblance in the characters of the cirrus-joints, though their number 

 is less ; while they are much shorter than those of Antedon abyssorum (PI. XXIX. 

 fig. 10). 



One individual is peculiar in having only two radials on one ray ; but the axillary 

 or second radial is altogether different from the other rhombic axillaries, for it is 

 broadly pentagonal in form, with a perfectly even proximal margin, and no indication 

 whatever of a backward projecting proximal angle (PL XXIX. fig. 6). 



10. Antedon longipinna, n. sp. (PL XXX. figs. 1-3). 

 Specific formula — A.-y. 



Centro-dorsal rather sharply hemispherical, and bearing about thirty cirri, which have 

 twenty to twenty-five slightly overlapping joints, mostly longer than wide, and especially 

 so near the base. 



First radials just visible ; the second short, free laterally, and deeply incised by the 

 rhombic axillaries, which are about as wide as long and have a sharp distal angle 

 separating the first brachials. 



(ZOOL. CHALL. EXP. — PART LX.— 1887.) Ooo 24 



