REPORT ON THE CRINOIDEA. 



67 



The basals are almost trapezoidal, much wider below than above, and in contact with 

 one another by their truncated lower angles. The middle of the lower edge of each is 

 slightly tubercular. On their narrow upper edges rest the interradials. which are oblong 

 and a little higher than wide. Four of them terminate in a free edge at the margin of 

 the disk, where they are in contact with the lowest anambulacral plates. But that on the 

 anal side bears a small tapering appendage of four or five joints, the last of which seems 

 to end freely. The radials are larger than the interradials and somewhat strongly arched. 

 There is a muscular articulation between them and the first brachials ; but the articulation 

 between these and the next joints appears to be only bifascial. The arm-joints are long, 

 slender, and cylindrical. One arm seems to be broken at a syzygy in the sixth brachial ; 

 while another has a syzygy in the fourth, and again in the eighth brachial. The second 

 brachial bears the first pinnule, which is on the right side in three arms, and on the left 

 in the other two. The pinnules are very delicate and composed of long slender joints. 



Fig. \.—Thaumatocrinus rcnovatus, P. H. Carpenter. A, The calyx, anal side. B, The disk from above, aa, anal 

 appendage; an, anambulacral plates; at, anal tube; b, basal ; i 2 , second brachial ; al, centro-dorsal ; i, interradial; 

 o, oral ; r, radial, x 15. 



The central portion of the disc is occupied by five relatively large oral plates which 

 stand up around the peristome ; while between them and the margin are two or three 

 irregular rows of small anambulacral plates, some of them extending up on to the lower 

 part of the long anal tube. The brachial ambulacra are not plated, however, and lie in 

 the arm-grooves, close down between the muscles but with no traces of sacculi. 



Colour in spirit. — Dirty white. 



Locality.— Station 158, March 7, 1874; kit, 50° 1' S., long. 123° 4' E.; 1800 

 fathoms; Globigerina ooze ; bottom temperature, 33°-5 F. One specimen, much muti- 

 lated and probably young. 



