I6G 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Thorax with numerous strong longitudinal muscle bands and less 

 well-developed transverse muscles underlying them. Abdominal 

 muscles mainly longitudinal and gathered into less definite bands 

 than on the thorax. 



Tentacles eight in number, of two orders placed alternately. Ad- 

 ditional smaller ones were not certainly demonstrated. 



Dorsal languets removed about the width of three stigmata to the 

 left of the median dorsal vessel. 



Branchial sac with 9 or 10 rows of stigmata; 

 about 1G in a row on each side in the anterior 

 part, but one or two less in the most posterior 

 rows. 



Stomach wall with a considerably larger num- 

 ber (18 or 20) of longitudinal plications in its 

 walls than in the case of Amarouciwm crateH- 

 femm. The plications are narrow and some of 

 them are often, if not usually, more or less irreg- 

 ular in length and arrangement. 



No peculiarities of the reproductive organs 

 were noted. Ovaries poorly developed in the 

 specimens examined ; situated in the anterior part 

 of the abdomen. The testes form a double series 

 along the common sperm duct in the part of the 

 post-abdomen behind the ovaries. 

 Localities of the Albatross specimens : 



Feb. 15, 1908, 29 

 One colony (Cat. 



113 



Fig. 113. — Amaroc- 

 cium mult1plica- 

 tum (sluiter). 

 Zooid. X 20. 



No. 84. Station (off Jolo Light, 



fathoms, coral sand). 



No. 5954, U.S.N.M.). 



Nos. 86, 163. Station D5145 (near Jolo Light, Feb. 



15, 1908, 23 fathoms, coral sand and 



shells). Several colonies (Cat. Nos. 



5953 and 5965, respectively, U.S.N.M. ) . 



Several additional colonies in the United 

 States National Museum were collected by Mr. S. F. Light on eel 

 grass in Porta Galera Bay, Mindoro. 



Sluiter (1909) describes this ascidian from colonies from reefs at 

 Tial, Ki Island, and Haingsisi, Saman Island. Except that they 

 appear to have several more rows of stigmata (a character perhaps 

 subject to variation with age as well as individually), the Albatross 

 specimens agree accurately with Sluiter's description. 



