262 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The 15 arms arc about 130 mm. long. The first brachials are very short, five or six 

 times as broad as long, with the inner portion curving about and extending to beyond 

 the middle of the second brachial where it is bounded by a line at right angles to the 

 lateral edge. The inner corner of this distal border is extended in the form of a more 

 or less pronounced tooth which fits deeply into a corresponding excavation in the side 

 of the second brachials. The second brachials are about twice as long as the first. 

 They arc irregularly half-moon shaped, as a result of the overlapping of their proximal 

 portion by the distal extensions of the first brachials, but their inner angles are some- 

 what abruptly produced over the ends of these processes, coming into lateral contact. 

 The lateral borders of the first two brachials are siighlly turned outward. On arms aris- 

 ing directly from a IBr axillary the first syzygial pair (composed of brachials 3+4) is 

 about three times as broad as long, oblong, but with the proximal and distal borders 

 broadly sinuous. The next seven brachials are wedge-shaped, about three times as 

 broad as the median length, and those following become triangular, about as long as 

 broad, and wedge-shaped again in the outer portion of the arms. 



Pi is 12 mm. long and is composed of 30 segments. It is rather stout at the base, 

 but tapers evenly and rather rapidly so that the distal fourth is slender and delicate. 

 The first segment is large, much broader than long, and is extended distally both at the 

 dorsal and ventral angles so as to overlap for some distance the proximal angles of 

 the second. The second segment is scarcely two-thirds as broad as the first, not quite 

 twice as broad as long; its distal dorsal and ventral angles are extended slightly for- 

 ward, and are more or less blunted or rounded off. The third segment is similar, but 

 the distal processes are shorter and more broadly rounded. The following segments 

 have the outer portion of the distal border curved toward the pinnule tip. The seg- 

 ments increase in length very slowly, not becoming as long as broad until very near the 

 pinnule tip. All the segments, except those at the extreme end of the pinnule, are 

 somewhat produced dorsally and sharply carinate. 



P 2 is 13 mm. long, stouter than Pi and tapering more gradually so as to lack the 

 delicate tip. It is composed of 25 segments which become as long as broad on the 

 twelfth and somewhat longer than broad terminally. 



P 3 is 13 mm. long with 20 segments, tapering still more gradually than P 2 . The 

 segments become as long as broad on about the twelfth, and slightly longer than broad 



distally. 



On the genital pinnules the third, fourth, and fifth segments are somewhat enlarged 



and broadened to protect the gonads. 



The distal pinnules are 13 mm. long with about 16 segments, most of which are 



from half again to twice as long as broad. 



Examination of enlarged photographs of the type specimens of macilenta and 



occidentalis fails to reveal any significant character by means of which they may be 



distinguished. 



Localities.— South of Timorlaut (lat. 11° S., long 131 °30' E.; 914 meters; cable 



repair ship Patrol, Eastern and Associated Telegraph Company [A. H. Clark, 1929] 



(1,B. M.). 



Laccadivo Islands (lat. 10°47'45" N., long. 72°40'20" E.); 1,288 meters; Investi- 

 gator [A. H. Clark, 1909, 1912, 1916, 1918; Gisl6n, 1934] (1, I. M.). 



