518 BULLETIN 82, UNITKD STATES NATIONAL MUSEUM. 



These pentacrinoids, which have about 14 columnals, are in general similar 

 to the pentacrinoids of Comactinia meridionalis. 



No species of Comasteridse has heretofore been reported from the Hawaiian 

 Islands. 



?L.\MPRO]METRA, 8P. 



A very interesting pentacrinoid collected by the Danish consul at Singapore, 

 Mr. Svend Gad, in 1907, can not with certainty be assigned to any one of the 

 numerous species of comatulids inhabiting that locality. 



The column, with the distal portion missing, consists of 33 columnals, includ- 

 ing centrodorsal. 



The centrodorsal is relatively high, its length being approximately equal 

 to that of the third and fourth columnals combined, or about three times that 

 of either of the two immediately following. In its distal third it suddenly 

 broadens, so that this portion extends outward beyond the parallel sides of the 

 more proximal portion like the flange on a car wheel, its outer border reaching 

 to a point almost directl}' beneath the distal border of the first cirrus segment 

 when the cirri are straightened out. The diameter of the distal third of the 

 centrodorsal is about one-third greater than that of the proximal two-thirds. 



The second columnal is short and discoidal, about four times as broad as long, 

 and is equal in breadth to the proximal two-thirds of the centrodorsal. The 

 third is very slightly longer, and very slightly less broad. The fourth is a short 

 cylinder, about equal in width to the third, and about twice as broad as long. 

 The fifth is about one-third longer than broad and slightly constricted centrally. 

 The sixth is twice as long as broad, with a more prominent median constriction and 

 a narrow median raised girdle which shows a rounded profile. The next is similar, 

 but longer. The following are cylindrical, with somewhat abruptly enlarged 

 ends, and without a median girdle ; they increase slowly in length to the eighteenth 

 and following, which are about four and one-half times as long as the median 

 diameter. In the distal third of the column as preserved its diameter decreases 

 very gradually, so that the last segment is only about two-thirds as long as and 

 half as broad as the eighteenth. 



There are four cirri present, whicli are of different lengths, radial in position, 

 directed upward and lying close to the sides of the calyx. The longest of these 

 reaches to just be3'ond the articulation between the IBr, and IBr,. It is com- 

 posed of nine segments and a long slender and slightly curved terminal claw which 

 is almost as long as the two preceding segments combined; the first segment is 

 about as long as broad, the next is about one-third longer than broad, the follow- 

 ing six, which are slightly less in diameter than those preceding, are about as 

 long as broad, the antepenultimate is slightly longer than broad, and the penulti- 

 mate is about as long as broad. The last differs from the preceding in being tri- 

 angidar instead of quadrilateral in side view, the proximal border sweeping in 

 a broad curve from its junction with the ventral border to the dorsal base of 

 the terminal claw ; the angle formed between the ventral and the distal borders is 



