172 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The brachials from the fifth or sixth onward have prominent and finely spinous 

 distal ends. 



The first syzygy usually occurs between brachials 2 + 3, but it may be between 

 brachials 1 + 2 or 3 + 4, while on some arms syzygies occur between brachials 1+2 and 

 3+4. The next syzygy may be anywhere from between brachials 1 7 + 1 8 to between 

 brachials 41 +42, and the distal intersyzygial interval is very irregular, varying from 

 8 to 27 muscular articulations. 



The lowest pinnule (P D , P P , or PO is 23 mm. long, rather slender, though slightly 

 stouter than those following, and is composed of about 52 segments, of which the 

 first 2 are about twice as broad as long and those following increase slowly in length 

 to the ninth which, with the remainder, is about as long as broad. The terminal 

 comb is prominent and begins rather abruptly. It is composed of 15 teeth which 

 are rounded triangular, nearly twice as long as broad at the base, and rather strongly 

 recurved. P 2 is 18 mm. long, similar to P t but slightly more slender, with the seg- 

 ments becoming as long as broad at about the seventh. P 3 is 10 mm. long, very 

 nearly as stout basally as P 2 but tapering more rapidly. P 4 is 9 mm. long, and re- 

 sembles P 3 . P 5 is 8 mm. long and resembles P 4 . P 8 is 7 mm. long and resembles 

 P 5 . P 7 and the following pinnules are stouter than the 3 or 4 preceding, but they 

 become abruptly slender in the terminal portion and bear terminal combs. They 

 are composed of about 22 segments, of which the first 2 are broader than long and 

 the remainder are about as broad as long. Terminal combs occur as far out as P 2 i. 

 After P 7 the pinnules begin to increase very slowly in length, after the proximal 

 third of the arm also becoming gradually more slender. The distal pinnules are 

 12 mm. long and are composed of about 25 segments, of which the first 2 are about 

 twice as broad as long and the third and following are about half again as long as 

 broad with prominent articulations. The distal ends of the segments of all the 

 pinnules except the first 4 or 5 are everted and spinous and the dorsal surface of the 

 segments of the middle and distal pinnules is finely spinous, especially in their outer 

 portions. 



The whole surface of the animal is covered with a finely reticulated membrane 

 like fine white netting which only opens along the ambulacral grooves along the edges 

 of which it forms a band from which a row of small scallops project outward appear- 

 ing like covering plates. This organic network completely hides the articulations 

 of the brachials and pinnulars unless it is contracted by drying. It is especially 

 thick at the articulations of the pinnule segments causing them to stand out white 

 against the darker general surface of the segments and giving the pinnules a character- 

 istic finely banded appearance like those of Nemaster discoidea. 



The color in alcohol is brownish yellow with a somewhat grayish cast, the pin- 

 nules very finely banded brown and white. 



Notes. Dr. P. H. Carpenter examined two very fine specimens from Kagoshima 

 Bay, Japan, which had been dredged by Dr. Ludwig Doderlein. He wrote that, 

 apart from their large size and somewhat smoother arms than usual, they are also 

 remarkable for the peculiar mottled appearance of the disk, which is naked and with- 

 out the calcareous concretions that occur in specimens of multiradiata from further 

 south, and the type specimen of that species. 



