76 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251 



Figure 24. — a, Didemnum {Didemnum) dorotubu, new name: right side of larva from 

 a Philippine colony, b-e, Didemnum {Didemnum) misakiense (Oka & Willey): b, colony 

 from Philippine Islands, X 1.5; c, schema showing longitudinal section of mammillary 

 process of same; d, e, very short and bifid atrial languet {1) of zooids of same colony, 

 posterior side (d.g.= dorsal ganglion). /, Didemnum {Didemnum) ternatanum (Gott- 

 schaldt): the 41 mm. wide colony from Palau Islands, sta. 67. 



