i37 



P, is from 10 mm. to 11 mm. long-, composed of 29 segments, slender, but not so weak 

 as is usual in the genus, and more or less stiffened; the first tvvo segments are enormously 

 enlarged, subequal, three to four times as broad as long, and nearly twice as large as the 

 corresponding segments on P 2 ; the third segment occupies about one third of the median distal 

 border of the second, and is about as broad as long; the following segments are slightly longer 

 than broad, becoming about as long as broad in the distal half of the pinnule. F a is very small 

 and weak, not half so long as P : ; on the inner arms P l resembles P„, and on the outer side 

 of the IIBr series it is intermediate between P„ and P.. P. is 11 mm. to 12 mm. lono- w ith 



1 M ö * 



18 — 21 segments of which the fourth and following are about twice as long as broad; the 

 pinnule is straight and stiff, but not particularly enlarged; the first segment is about three 

 times as broad as the median length, about twice as broad basally as the third ; the second 

 is of about the same length, but is not quite so broad; it bears a slight rounded carinate 

 dorsal process; the third is about half again as long as broad. On the inner arms P., is the 

 longest. On the outer arms P., is 15 mm. long with 17 segments which are more elongate 

 than those of P 3 , nearly or quite three times as long as broad ; the pinnule is similar to P., 

 but very slightly stouter, and the second segment has the carinate process much reduced; the 

 first and second segments are not quite so much enlarged, in fact scarcely enlarged at all ; 

 the third segment is narrowly carinate, at least basally. P 4 is 11 mm. long with 15 segments, 

 those beyond the third much elongated; the second-fourth are slightly carinate. P, is 9 mm. 

 long with 13 segments, resembling P v but the component segments are not quite so long; 

 there is a slight production of the distal dorsal border of the outer segments on P 4 , which 

 increases on P. and P 6 . P 6 is 7 mm. long with 13 segments, resembling P.. P„ is 5 mm. long. 

 P 7 and P s become stouter and more sharply prismatic than the preceding, which are rounded 

 prismatic. The distal pinnules are rather slender, 8 mm. long with 16 segments of which the 

 terminal five are suddenly and disproportionately small and short. 



The disk is lacking in all the specimens; the side- and covering-plates are highly 

 developed as in the other species of the genus. 



The colour is sulphur yellow, crossed on the arms and cirri with numerous narrow 

 purple bands, or yellow, the pinnules with narrow purple bands. 



This species has the broad and patent habit characteristic of the many armed species 

 of such genera as Comanthus. The centrodorsal is thin, but very broad, and bears about its 

 margin a regular row of stout strong cirri of which the proximal portions lie all in the same 

 plane, the distal portions being recurved. The arms spread out horizontally from the calyx just 

 as the cirri do from the centrodorsal, and so thin is the latter that the dorsal portion of the 

 earlier division series rests upon and among the horizontal earlier portions of the cirri. The 

 eversion of the borders of the ossicles of the division series and of the earlier brachials suggests 

 the general aspect of such species as Pectiiiometra jiavopurpjirea. 



3. Neoiuetra alccto (A. H. Clark). 



A. H. Clark. Proc. U.S. Nat. Mus., vol. 39, 191 1, p. 544 [Calometra alccto). 

 Records of the Western Australian Museum, vol. 1, 1914, N" 3, p. 130. 



SIBOGA-EXl'EDITIE XLII /'. iS 



