226 



THE VOYAGE OF H.M.S. CHALLENGER. 



j3. Not over twenty-five cirrus-joints ; the first 

 pinnule much smaller than the second, 

 b. Cirri carinate, but not spiny. 



(i) No post-palmars ; lower brachials flattened ; two 

 radials visible. 

 a. Fourth pinnule altogether smaller than the 



third, . .■ . 



ft Fourth pinnule nearly similar to the third, 

 (ii) Post-palmars ; axillaries almost concealed, . 



b. Second and third pinnules about equal in size. 



1. Thirty-five to forty cirrus-joints, the later ones distinctly spiny, 



2. Twenty-five to thirty cirrus-joints, the later ones with pointed 



keels ; lower brachials flattened, .... 



c. Third pinnule larger than the second. 



1. Spiny cirri. 



a. Rays well separated ; no post-palmars ; second syzygy 



about the fourteenth brachial, 



b. Rays in close contact, and slightly flattened laterally ; 



postpalniars ; second syzygy about the twentieth 

 brachial, ...... 



2. Cirri not spiny ; second syzygy about the twentieth brachial, 



palmata, Mull., sp. 



brevicuneata, Carpenter. 



7. similis, n. sp. 



8. occulta, n. sp. 



articulata, MulL, sp. 



9. regalis, n. sp. 



elongata, Mull., sp. 



flagellata, Mull., sp. 

 bimaeidata, Carpenter. 



1. Anteclon manca, n. sp. (PL XLIV. figs. 2, 3). 

 Specific formula — A. 2. 2. y. 



Description of an Individual. — Centro-dorsal a thick disk, with a flattened dorsal 

 surface and about twenty marginal cirri. These have twenty-five to thirty joints, a few 

 of which are longer than wide, and develop a dorsal spine from the eighth onwards. 



First radials concealed ; the second oblong, and quite free laterally ; auxiliaries 

 pentagonal. Two distichals and two palmars, the axillaries not syzygies ; but the 

 pal mars are only developed on the outer pair of every four secondary arms, so that there 

 are normally six arms to each ray, viz., 2,1,1,2. But one palmar axillary is undeveloped, 

 giving twenty-nine arms only. They have about one hundred smooth and rounded 

 joints, the first few discoidal, and the following ones triangular, about as long as wide, 

 but becoming quadrate further out. A syzygy in the third brachial, and the next about 

 the eighteenth or twentieth ; others at intervals of three to nine, usually five or six 

 joints. 



The third brachial has no pinnule at all, while that of the second brachial is always 

 absent on the innermost of every two arms springing from a palmar axillary, and 

 sometimes also on the arms which are borne directly on the distichal axillaries. But it 

 is sometimes present on these latter arms, and always on the two outer arms of each ray, 

 though varying in size, consisting of twelve or fifteen joints, most of which are longer 

 than wide. 



