32 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



again terminally; P 2 5 mm. long, stouter and stiller than P x (the 

 largest pinnule on the arm), with eleven or twelve segments; first 

 segment about twice as broad as long, second almost or quite as long 

 as broad, the following gradually increasing in length, being twice 

 as long as broad in the distal half of the pinnule; the distal edges of 

 the second and following pinnule segments are slightly everted and 

 finely spinous, and the dorsal distal angles of the segments are pro- 

 duced in the form of a short blunt process tipped with a tuft of fine 

 spines; P 3 3 mm. long, with about twelve segments proportioned as 

 in P 2 ; the pinnule is slightly less stout basally than P u and is shorter, 

 weaker, and more slender than that pinnule; following pinnules 

 similar, soon gradually increasing in length and becoming more 

 slender, the distal pinnules being about 6 mm. long with about 

 eighteen much elongated segments, and exceedingly slender. 



The color is light yellowish, the primibrachs, a narrow band at the 

 level of the second syzygy, and a few ill-defined bands in the distal 

 portion of the arms, purple; perisome brown; cirri and P 2 straw yellow. 



Locality. — Mauritius; the type, which is in the Berlin Museum, was 

 collected by Prof. K. Mobius. 



DECAMETRA MODICA, new species. 



Description. — Centrodorsal small, discoidal, with a very small dorsal 

 pole ; cirrus sockets arranged in two closely crowded irregular rows. 



Cirri XIV-XVI, 16-20, 8 mm. long; first segment short, the fol- 

 lowing slowly increasing in length and becoming terminally about as 

 long as broad; third and following with slightly produced distal 

 dorsal edges which gradually become narrower and move to a more 

 central position, on the last five or six segments preceding the penul- 

 timate becoming a very small sharp median spine; opposing spine 

 prominent, sharp, slender, subterminal, directed obliquely forward, 

 much larger than the spines on the preceding segments, in height 

 equal to one-half the lateral diameter of the penultimate segment. 



Radials short, about two and one-half times as broad as long; 

 IBr t oblong, rather more than twice as broad as long; IBr 2 pentagonal, 

 broader than long, the distal edges slightly thickened. 



Ten arms 35 mm. to 40 mm. long, resembling those of D. informis, 

 but the brachials are slightly longer. 



Pj 3.5 mm. long, with eleven or twelve segments, the first short, the 

 second about as long as broad, the following slowly increasing in 

 length and becoming three times as long as broad terminally; the 

 pinnule is comparatively stout and resembles P 2 , though, in direct 

 proportion to its lesser length, smaller; P 2 4.5 mm. long with thirteen 

 segments, the first short, the second about as long as broad, the fol- 

 lowing gradually increasing in length and becoming twice as long as 

 broad distally; third and following segments with slightly projecting 



