REPORT ON THE CRINOIDEA.. 233 



from the base to the tip of the pinnule, so as to give it a remarkably stiff and tapering 

 appearance (PI. XLV. fig. 3). There is some indication of this in Antedon marginata, 

 but its large pinnules are less stiff, with relatively shorter joints, which are more uniform 

 in diameter, so that the pinnule lacks the tapering and styliform appearance which is so 

 marked in Antedon spicata and Antedon tuberculoid. Its cirri too are both smaller 

 and have fewer joints than those of Antedon tuberculata, while the second radials 

 and the axillaries are more equal in length, and portions of the first radials are visible 

 (PL XL. fig. 1 ; PL XLV. fig. 2). 



Antedon tuberculata has many points of resemblance with Antedon spicata from the 

 Banda Sea, and it may be that a larger knowledge of both types wdl eventually lead to 

 their union. The cirri of Antedon tuberculata are both considerably more numerous and 

 reach a larger size than in Antedon spicata, though the actual number of joints composing 

 them is the same in both forms. The second radials of Antedon tvherculata are short as 

 compared with the axillaries, not reaching half their length ; while in Antedon spicata 

 the axillaries are short as compared with the second radials. The arms of the latter type 

 are also longer than in Antedon tuberculata, and the muscle-plates more prominent at 

 the sides of the ambulacra. 



Antedon indica differs from both these types in the slighter development of marginal 

 projections at the bases of the rays, and in the marked difference in the characters 

 of the second and third pairs of pinnules. The latter are not so stiff as in Antedon tuber- 

 cidata, but are considerably smaller than the second pair, consisting of a number of small 

 joints, like the first pair. 



6. Antedon conjungens, n. sp. (PL XLV. fig. 1). 

 Specific formida — A. 2.2. 2. y. 



Centro-dorsal a thick slightly convex disk, bearing about twenty-eight cirri round its 

 margin. They have twenty to thirty uniform joints, the later ones somewhat compressed 

 laterally, with a sharp dorsal edge which passes into the spine of the penultimate. 



First radials not visible; the second widely hexagonal, partly united laterally; 

 axillaries pentagonal. The rays, which are free from the second radials, divide thrice 

 and occasionally four times ; each series of two joints, the axillary without a syzygy. 

 Rather over forty arms of about one hundred and fifty joints, the first few discoidal, and 

 their successors shortly triangular, gradually becoming cpiadrate, but always much wider 

 than long. A syzygy in the third brachial, and the next between the fourteenth 

 and twentieth, generally about the fourteenth or fifteenth ; others at intervals of five 

 to eleven, usually seven or eight, joints. 



Of the four or more arms borne on each distichal axillary the two outer ones have 



(ZOOL. CHALL. EXP. PART LX. — 1887.) OoO 30 



