146 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Of the 11 specimens of alata examined by Hartlaub, 3 had 11 arms and one had 

 13 arms; of the type specimens, 1 has 11 and the other 12 arms. Of the specimens of 

 alata seen by Hartlaub, only 2, one from Blake station 249 and the other from Blake 

 station 232, had 20 arms. 



As in pulchella the decrease in size of the proximal pinnules may be very gradual, 

 or P 2 may be abruptly shorter than P!. This latter condition occurs in 2 specimens 

 from Blake station 294, one of which is referable to alata, the other to pulchella. 



The processes on the pinnule segments are very strongly developed and assume 

 the character of high keels. They are most strongly developed on the pinnules of 

 those specimens in which the brachials also have very strong processes on the distal 

 ends. The spines on the carinate processes of the pinnule segments are smaller than 

 the corresponding spines in pulchella. On the first 3 pinnules the processes them- 

 selves, in correlation with the character of the brachials which bear them, are less 

 developed than on those following. 



In alata the segments of the distal pinnules are relatively broad and strongly 

 spinous. 



Sometimes, as in a specimen from Blake station 249, the whole anal area as far 

 as the anal opening is covered with large calcareous warts, these being more scattered 

 in the other interradial areas. 



In most specimens there are dark dorsal longitudinal stripes on the arms. 



Hartlaub believes that alata scarcely reaches so large a size as pulchella. 



Of the specimens from Albatross station 2331, one is a small but very typical 

 example with 14 arms, and the other is a very small specimen with 10 arms. 



A very young 10-armed specimen from Blake station 269 and another from Blake 

 station 277 in spite of their small size show the characteristic features of alata to a 

 marked degree. The IBrj in the one from station 277 are very close together, and 

 in the one from station 269 are already in lateral contact. In both the arms are 

 narrow at the base and gradually broaden toward the middle. 



From Blake station 298 there is a young individual undergoing adolescent autot- 

 omy; the IIBr axillary and the 2 arms borne by it are very small. The cirri have 3 

 short basal segments. The IBr! are laterally free. The seventh-fourteenth brachials 

 have the characteristic strong everted processes on the pinnule side of the distal 

 border. The brachials are relatively short. Most of the arms are markedly broad- 

 ened in the middle, up to about the thirtieth brachial. The cirri are rather short, 

 with about 20 segments. The color is uniform light brown. 



The specimen from Blake station 294 has between 16 and 20 arms. 



The 2 Hassler specimens are the originals from which the species was described. 

 Both are young and much broken. One has 11, the other 12 arms. The centrodorsal 

 is small. In one the cirri are in a single marginal row, in the other in a partially double 

 marginal row. The cirri are slender and rather short; the relative shortness of the 

 fourth and fifth segments is noteworthy. In this they agree with a typical 19-armed 

 specimen from Blake station 269. The IBr t are laterally free and rounded. The color 

 is light grayish yellow, with the syzygial pairs and the adjacent parts darker. Each 

 brachial has the half of the distal edge on the pinnule side abruptly everted and pro- 

 duced directly outward in the form of a high flange. 



