578 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The specimens from Mortensen's station 13 exhibit the following features: 



The cirri are XXV, 19, from -12 to 17 mm. long. The 19 arms are from 50 to 

 70 mm. in length. The pinnules as far as P 3 bear combs of 8-12 teeth. The disk 

 is 14 mm. in diameter. 



The 18 arms are from GO to 90 mm. long. 



The 18 arms are from 50 to 60 mm. in length, and the disk is 14 mm. in diameter. 



The 20 arms are from 50 to 60 mm. long, and the disk is 12 mm. in diameter. 



The 20 arms are from 50 to 60 mm. in length, and the disk is 16 mm. in diameter. 



The cirri are XXX, 20-21, from 16 to 19 mm. in length. The 25 arms are 70 

 mm. long. The disk is 19 mm. in diameter. Gisle'n says that this specimen is of 

 the dark-color type. 



The arms are 19 in number, all broken. The disk is 13 mm. in diameter . 



The cirri are XXIV, 14-16, from 8 to 11 mm. long. The diameter of the centro- 

 dorsal is 2.2 mm. The 14 arms are from 35 to 55 mm. long. The division series 

 are to the left in 3 cases, and to the right in 1 case. The pinnules as far as P 3 bear 

 combs. The disk is 8 mm. in diameter. The anal tube is central. 



The centrodorsal is 2.2 mm. in diameter. The cirri are from 8 to 13 mm. long. 

 The 17 arms are all broken. The disk is 9 mm. in diameter. 



The specimen from Tokyo Bay has 36 arms about 70 mm. in length. The 

 centrodorsal is thin discoidal, with the dorsal pole 6 mm. in diameter. The cirri are 

 numerous, about XXXV, 18-20, about 12 mm. long, and slender. The division 

 series are very broad, almost or quite in lateral contact. 



Remarks. In the typical form of this species the division series are very massive, 

 forming a compact cup, so that none of the perisome is visible from the dorsal side. 

 Indeed, the division series are sometimes so very closely joined that it becomes 

 difficult to trace the sutures between them. 



Very small specimens show that this character is assumed at an early period of 

 growth. 



Localities. Formosa Channel; 64 meters; Captain Suensson, November 23, 

 1901 [A. H. Clark, 1909, 1912, 1913, 1918] (1, C. M.). 



Northeast of Swatow, China (lat. 23 15' N., long. 117 40' E.); Capt. H. Chris- 

 tiansen, July 26, 1912 (4). 



Albatross station 4894; Eastern Sea, between 10 and 20 miles southwest of the 

 Goto Islands; Ose Said light bearing N. 41 E., 5 miles distant (lat. 32 33' 00" N., 

 long. 128 32' 10" E.); 174 meters; green sand, broken shells, and pebbles; August 

 9, 1906 (9, U.S.N.M., 35074, 35154, 35155). 



Albatross station 4893; Eastern Sea, between 10 and 20 miles southwest of the 

 Goto Islands; Ose Saki Light bearing N. 29 E., 5.5 miles distant (lat. 32 32' 00" N., 

 long. 128 32' 50" E.); 174-194 meters; bottom temperature 13.28 C.; gray sand, 

 broken shells, and pebbles; August 9, 1906 (4, U.S.N.M., 34997). 



Mortensen's station 10; off the Goto Islands (lat. 33 41' N., long. 128 50' E.); 

 137 meters; sand; May 17, 1914 [Gisle'n, 1927]. 



Mortensen's station 13; southwestern Japan, off Kin Shiu (lat. 34 20' N., 

 long. 130 10' E.); 110 meters; sand and shells; May 18, 1914 [Gislen, 1927]. 



