REPORT ON THE CRINOIDEA. 129 



most of which are longer than wide and sharply compressed along, the dorsal edge, the 

 penultimate with an inconspicuous spine. 



Three radials visible ; the first short and band-like, marked by occasional grooves and 

 projections. The second longer, with flattened lateral borders but sharply convex in the 

 centre, where they rise to meet the backward projections of the axillaries. These and 

 the first three brachials have a high centre and depressed margins like the second radials, 

 with sharp lateral edges and flattened sides. Ten arms ; the basal joints rather short, 

 with a sharp medio-dorsal line ; the following joints obliquely quadrate and more 

 distinctly carinate, so as to overlap. Syzygies in the third and about the fourteenth 

 brachials ; others at intervals of five to eight joints. 



The first pinnule rather larger than its immediate successors ; their basal joints short 

 and laterally compressed, with a sharp dorsal edge. In the pinnules of the tenth and 

 following brachials the third joint and its successors are not expanded, but gradually 

 become longer than wide, and in the terminal pinnules are much elongated. 



Disk invisible ; covering plates of the pinnule-ambulacra supported on a limestone 

 band which is not distinctly segmented. Sacculi variable, but not very common. 



Colour in spirit, — light brownish-white. 



Spread probably 15 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, 41°"8 F. One specimen. 



Remarks. — This species has straight-edged and wall-sided arm-bases, just as in 

 Anteclon basicurva and Antedon incisa. But it differs altogether from these types in 

 the characters of the pinnules on the proximal third of the arm. So far as I have been 

 able to make out, without mutilating the specimen, the proximal pinnules have some- 

 what of the trihedral form with flattened outer sides which is characteristic of Antedon 

 basicurva (PI. XXII. fig. 4). Their next successors are altogether different, however, 

 the third and following joints gradually becoming relatively longer until they attain the 

 usual elongated shape which is characteristic of the middle and terminal pinnules. But 

 they acquire this shape at about the tenth or twelfth brachial, so that they differ from 

 the broad and expanded pinnule-joints in the corresponding part of the arm of Antedon 

 tuberosa (PL XXIII. figs. 2, 3), and the genital glands are unprotected by plates. The 

 side plates of the pinnule-ambulacra are not well differentiated, and the sacculi are 

 variable in their distribution, being moderately abundant in some pinnules and rare in 

 others. 



The arrangement of the cirri is peculiar. There are none upon the interradial 

 portions of the centro-dorsal ; but beneath each ray there is a somewhat irregular vertical 

 row of two, three, or occasionally four sockets, all the rows converging on the apex of 

 the subconical centro-dorsal. 



(ZOOL. CHALL. EXP. — PAET LX. 18S7.) OOO 17 



