NO. 1798. CRIN0ID8 COLLECTED BY THE ALBATROSS— CLARK. 531 



they agree with nigra. It would thus appear that, while the fre- 

 quency of the arm division can usually be relied upon to separate 

 these two species, it is not so diagnostic as the characters presented 

 by the centrodorsal and the cirri. 



Genus COMISSIA. 



COMISSIA LiJTKENI (A. H. Clark). 



Station 5483. — Two specimens, closely resembling the type and 

 cotype, but darker in color. The arms are dark greenish yellow, the 

 pinnules chrome yellow, the cirri dull greenish yellow with dusky 

 bands. One of the specimens has the mouth central and the anal 

 tube marginal ; the disk of the other is lacking. 



COMISSIA DUMETUM, new species. 



This new form is in general similar to C. lutlceni. The cirri, how- 

 ever, are more slender, the longer proxunal segments somewhat more 

 strongly constricted centrally, the distal with the dorsal processes 

 slightly more pronounced; the cirri of the type are XV, 26-27, 15 

 mm. to 17 mm. long. 



The ten arms of the type resemble those of C. liltJceni and are about 

 100 mm. long. 



The pinnules are as in C. liltkeni, but the distal ends of the segments 

 are more prominent and more spinous, and the dorsal surface is much 

 more spinous. The spine at the ventral distal angles of the segments 

 of the middle and distal pinnules is much longer than in C. liltkeni and 

 somewhat more slender; on the outer segments its length is equal to 

 the transverse diameter of the segment bearing it; it may be more or 

 less branched, especially at the tip. 



The color is olive green, the cirri blotched with lighter. 



Type.— Cat. No. 27484, U.S.N.M., from station 5356. 



Ten additional specimens were secured at this station. 



COMISSIA HISPIDA, new species. 



Centrodorsal thin-discoidal, the dorsal pole flat, 3.5 mm. in diam- 

 eter; cirrus sockets in a single fairly regular marginal row. 



Cirri XXII, 9-10, 8 mm. long; first segment very short, second 

 about twice as broad as long, third the longest, about four times as 

 long as the proximal diameter, a transition segment; next segment 

 about twice as long as broad, the remainder about as long as broad; 

 the second segment has both ends somewhat expanded ; the third has 

 the distal end somewhat expanded, this character dying away on the 

 succeeding segments; the segments as far as the third are rounded in 

 cross section, the remainder laterally flattened so that they appear 

 considerably broader in lateral view; the fourth and following have 

 small subterminal median dorsal tubercles; opposing spine small, 

 median in position. 



Alouth subcentral, anal tube submarginal. 



