582 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



have the distal outer edge rather strongly produced and spinous, this feature gradually 

 dying away as the segments become longer. The terminal comb is composed of about 

 9 teeth which are rather small and well rounded and are repeated, usually slightly 

 smaller, on the opposite side of the pinnule. P! is slightly less stout basally than P D 

 and slightly shorter. P 2 is about 5 mm. long, small, and weak. P 3 and the following 

 pinnules are 6 or 7 mm. long, stouter and tapering much less rapidly than P 2 , composed 

 of 20-23 segments, of which the third-seventh or -eighth bear a very strong spiny 

 carinate process, diminishing in height distally. The distal pinnules are of about the 

 same length, but slender. The terminal comb is not present after P 2 . The strong 

 carination of the proximal pinnule segments, which is one of the most marked char- 

 acters of the species, persists even in the terminal pinnules, though in a somewhat 

 reduced form. 



The color in alcohol is light yellowish brown, mottled with gray or darker brown ; 

 or brown, the arms with a median line of darker. 



Notes. One of the specimens from Broughton Island has 20 aims 90 mm. long, 

 and the cirri XXVI, 19-21, 12 mm. long. Two of the others are similar, with 24 and 

 28 arms. Another is small, with 16 arms 35 mm. long, and the last is also small. 



One of the specimens from Watsons Bay has 22 arms 110 mm. long, and the 

 cirri XIX, 18-20, 12 mm. long. Another has 31 arms, and the cirri XLVI, 14 mm. 

 long. A third has 28 arms and the cirri XLII. 



In the 2 specimens from Bottle and Glass Rocks the centrodorsal is very small. 



One of the specimens from Port Jackson is typical, with 20 arms 100 mm. long, 

 and the cirri XXXII, from 10 to 14 mm. in length. Three of the specimens are 

 peculiar hi having the centrodorsal very small, with the dorsal pole only 2 mm. in 

 diameter, though bearing the usual number of cirri. 



Having at hand a specimen from Port Jackson and a number from Port Phillip, 

 Carpenter said that the centrodorsal is a relatively broad disk. 



The cirri are XXX or more, 16. A few of the segments are longer than broad, 

 and the penultimate has but little trace of an opposing spine. 



The radials are scarcely visible. The IB^ are but partially united laterally. 

 The IIBr series are 4 (3 + 4). The IVBr series, if present, are 4 (3 + 4). The division 

 series are quite free laterally, and the distal angles of the axillaries are rather sharp. 



The 15-22 arms are 60 mm. long. The brachials are slightly overlapping, the 

 proximal being relatively short and triangular and the distal gradually becoming 

 longer and more quadrate. 



Syzygies occur between brachials 3 + 4, again from between brachials 11 + 12 to 

 between brachials 13 + 14, and distally at intervals of 4 or 5 muscular articulations. 



P D is about 9 mm. long, and PI is but little shorter. The next 2 or 3 pinnules 

 diminish rapidly in length, but become swollen for the gonads and lose the terminal 

 comb. The lower segments of the earlier pinnules sometimes overlap rather sharply 

 and have spinose edges. 



The disk is 9 mm. in diameter and is naked. The mouth is interradial. 



The color in alcohol is light yellowish brown mottled with gray or darkish brown. 



A specimen from Port Jackson hi the Museum of Comparative Zoology has 21 

 arms about 100 mm. in length. 



