REPORT ON THE CRINOIDEA. 



253 



R Palmar series developed above the distichals. 

 I. Two palmars, the axillary not a syzygy. 



a. The joints of the lower pinnules have lateral processes at their 



ends, . . . 



b. The joints of the lower pinnules have no lateral processes. 



1. Twenty-five to thirty-five cirrus-joints. 



a. Twenty cirri, the later joints not spinous ; second 

 syzygy not beyond the fourteenth brachial. 

 Tolerably equal pinnules on second distichal 

 and second brachial, .... 



(3. Twenty-five to thirty cirri with strong spines on 

 the later joints ; second syzygy about the 

 eighteenth brachial. Distichal pinnule smaller 

 than that of second brachial, . 



2. Forty-five to fifty-five cirrus-joints. 



a. Cirrus-joints smooth and longer than wide ; no 



spine on penultimate, .... 



[i. Cirrus-joints wider than long ; the later ones 



with faint tubercles, and the penultimate with 



a spine, ..... 



II. Three palmars, the axillary a syzygy. 



a. Forty-five cirrus-joints; the later ones short and spiny, 



b. Nearly sixty cirrus-joints, the later ones longer than wide and 



quite smooth. The terminal joints of the lower pinnules 

 much smaller than the basal ones, .... 





3. variipinna,' 1 Carpenter. 



4. quinduplicava, n. sp. 



savignyi, Mull., sp. 



acuticirra, Carpenter. 



ludovici, Carpenter. 

 jili'dlberti, Mull., sp. 



bipartipinna, Carpenter. 



1. Antedon angustiradia, n. sp. (PI. XLV. fig. 4). 

 Specific formula — A. 3.— . 



Description of cm Individual. — Centro-clorsal columnar, its sides bearing ten vertical 

 rows of cirri, usually four in each row, which alternate more or less with those of 

 adjoining rows. They are long and slender, reaching 25 mm. in length, with sixty or 

 seventy joints, a few of which are longer than wide. The distal edges of the outer half 

 have a forward projecting spine which becomes more marked in the shorter terminal 

 joints. Three radials visible ; the first short, and depressed at their lateral edges, the 

 second oblong, twice their length, quite free laterally, rather convex, and rising to the 

 middle of their junction with the pentagonal axillaries. The rays are quite free and may 

 divide a second time ; three distichals, the axillary with a syzygy. The first distichals 

 (or brachials) nearly oblong and quite free laterally ; the second quadrate, with a slightly 

 angular base. 



Fourteen arms, of about one hundred joints, at first triangular and then quadrate, the 

 later ones becoming narrow and elongated. A syzygy in the third, and then between 

 the twelfth and fifteenth brachials, with others at intervals of one to six, usually four or 

 five, joints. 



1 This species may have only ten arms ; see p. 194. 



