Clark — Four Neiv Echhi oder ms from the West Indies. 65 



the seventeenth and eighteenth (hut varying from between the thirteenth 

 and fourteenth to between the eighteenth and nineteenth); the distal 

 intersyzygial interval appears to be from six to eight oblique muscular 

 articulations. The syzygies are exceedingly difficult to detect as the 

 perisome covering the dorsal surface of the segments is somewhat swollen 

 and opaque, thus masking the structure underneath. 



Pj is about 15 mm. long, much stouter basally than the succeeding 

 but tapering with moderate rapidity and slender and flagellate in its 

 distal two-thirds, composed of about forty segments, at first about twice 

 as broad as long, more or less rhombic with the corners cut away, be- 

 coming about as long as broad and squarish after the tenth ; the termi- 

 nal comb is long, rising gradually, with twenty-five teeth, which at first 

 are low, after the fifth becoming blunt-triangular, higher than broad 

 basally (about as high as the lateral diameter of the segment bearing 

 them), with the apex leaning somewhat distally ; in the outer part of the 

 pinnule the shape changes somewhat, the last nine being much more 

 rounded distally, erect, and slightly shorter; the teeth are slightly re- 

 curved; P 2 is 8 mm. long, much more slender than P 2 basally and with 

 fewer segments, but otherwise similar to it, and with a similar comb; 

 the following pinnules gradually decrease in length to P 6 , which is 6 mm. 

 long with a rather small comb; P 6 is rather stouter than P 5 , which re- 

 sembles the preceding, and P 7 and the following pinnules are stouter 

 still, though slender in the distal half; this stoutness persists in the 

 following pinnules, though in the distal pinnules it is less in extent, 

 occupying only about one-third of their length; the genital pinnules are 

 about 6 mm. or 7 mm. long, stout basally but evenly tapering and be- 

 coming slender in the distal half, with sixteen segments of which the 

 first three are twice as broad as long, the fourth is somewhat smaller and 

 proportionately slightly longer, the fifth or sixth is squarish, those after 

 the ninth longer than broad, and the distal more than twice as long as 

 broad; the distal pinnules are 10 mm. long, the proximal segments much 

 broader than long, large, the following becoming gradually narrower and 

 proportionately shorter, squarish after the fifth or sixth, and slender and 

 rather more than twice as long as broad distally. The surface of the 

 pinnule segments is rough, and the ends are always more or less spinous; 

 the distal dorsal surface of the segments is usually studded with small 

 spines, but is never produced nor carinate. 



The color in alcohol is white. 



Type— Cut. No. 34,482 U. S. N. M., from "Albatross" Station 2321, 

 off Havana, Cuba, in 230 fathoms. 



Nemaster insolitus new species. 



The centrodorsal is discoidal, broad, rather thin, the flat polar area 

 from 3 mm. to 4 mm. in diameter, sometimes with a slight shallow median 

 pit; the cirrus sockets are closely crowded, arranged in one and a more 

 or less complete second alternating rows. 



The cirri are xv-xxi, 10-12, 10 mm. to 12 mm. long; the first segment 



