32 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



only XV cirri, the arms are 20 in number, and PI is very much shorter than P 2 . Of 

 the other species, he said, C. bella, C. cornuta, and C. emendatrix may have as many as 

 40 cirrus segments, or close to this figure. He noted that in C. cornuta, C. emendatrix, 

 and C. herdmani the proximal pinnules have a more or less pronounced carination on 

 the second and third segments just as in the two larger specimens from the Marshall 

 Islands. On the other hand, the small specimen from the Marshall Islands has more 

 slender and ventrolaterally smoother arms, a maximum of only 32 cirrus segments, 

 and no carination of the bases of the proximal pinnules. He said that evidently it is a 

 young individual, but if he had not had other specimens from the same locality he 

 could easily have been tempted to consider it as another specie^. He remarked that 

 so far as he could see all the "species" of the genus Cenometra are very little differ- 

 entiated from each other. Characters such as 30 or 40 cirrus segments, the occurrence 

 of ventrolateral processes on the arm bases, or carination of the bases of the proximal 

 pinnules are, according to him, due to different degrees of development. He is not 

 certain that the several species of Cenometra should not be included under one and the 

 same species. 



At present, he said, he prefers to consider the specimens from the Marshall 

 Islands and Fiji as representing a variety of C. bella., the first species described in the 

 genus Cenometra. 



According to him the new variety (magnifica) differs from bella in having more 

 cirri which in mature individuals have more segments, in having a proportionately 

 longer P lf and, in large specimens, in the presence of a carination on the bases of the 

 proximal pinnules. 



In the specimen from Annam the dorsal pole of the centrodorsal is bare, concave, 

 2.5 mm. in diameter. The cirri are XX, 35-36, about 25 mm. long. All the seg- 

 ments are short, the longest being from one-half to two-thirds as long as broad. From 

 the third or fourth segment onward there is a transverse tubercle, which soon becomes 

 transformed into a transverse ridge; this on about the tenth or twelfth develops into 

 a 2-pointed or double dorsal spine, which becomes single on the antepenultimate seg- 

 ment. The opposing spine is large, its height being equal to about half the width of 

 the penultimate segment. 



There are small ventrolateral flanges from the IBr 2 to the IIIBr 2 or the first 

 brachial. These flanges are interrupted at the articulations, this feature giving the 

 basal portions of the arms a scalloped profile. Low synarthrial tubercles are present. 



There are probably 31 arms, which are about 120 mm. long. The distal edges 

 of the distal brachials are a little serrate; however, the profile of the arms is tolerably 

 smooth. 



The second syzygy is 'from between brachials 20 + 21 to between brachials 33 + 34. 

 The distal intersyzygial interval is from 8 to 10 muscular articulations. 



P! is about 10 mm. long, smooth, recurved, and slender, with 25 segments. P 2 

 is 12 mm. long with 19 segments, and very stiff; the segments are short, about as long 

 as broad, and those from the seventh onward are distally edged with spines, especially 

 on the outer side. P 3 is 7 mm. long with 15 segments and is smooth, like the pinnules 

 following. The first-third segments of the distal pinnules are bluntly carinate. 



The color is violet with large brown spots on the dorsal side of the brachials. 



Gisle"n said that in regard to the proximal pinnules and the number of arms this 



