ASCIDIANS OF THE PHILIPPINES VAN NAME. 59 



ATOPOGASTER TROPICA Sluiter, 1909. 



1909. Atopogastcr tropicum Sluiter, Siboga -Exped., vol. 56fr, p. 107, pi. 



5, fig. 10; pi. 7, fig. 15. 

 1909. Atopogaster tropica Herdman, Bronn's Tier-reich, vol. 3, suppl., p. 



1465. 



Kapul Island, Sulu Archipelago, 13 meters (Sluiter, 1909). 



SYNOICUM INTERCEDENS (Sluiter), 1909. 



190D. MorehcUium interccdens Sluiter, Siboga-Exped., vol. 5G&, p. 108, 



pi. 5, fig. 11. 

 1909. Synoicvm intcrcedens Hartmeyek, Bronn's Tier-reich, vol. 3, suppl., 



p. 1476. 



Sulu Archipelago (Sluiter, 1909). 



Although a majority of the Malayan ascidians are probably "widely 

 distributed in that region and may sooner or later be found to occur 

 in Philippine waters, at least in the Sulu Archipelago, the following 

 additional species (13 in number) were obtained hy the Siboga Ex- 

 pedition at points such a short distance south of the Philippine 

 group that there is little doubt that they will eventually be found 

 within its limits. 



BotryUus separatus Sluiter, 1909, Mu.iras Reef (off the east coast of 



Borneo). 

 Corella aequabilis Sluiter, 1904, Knrkaralong Group and Karekelang Island. 

 RJuiteria rubricollis (Sluiter), 1904, Karkaralong Group. 

 Ecteinascidia nexa Sluiter, 1904, Karkaralong Group. 

 Polycitor violaceus Sluiter, 1909, Karekelang Island. 

 Polycitor multiperforatus Sluiter, 1909. Muaras Reef. 

 Trididcmnum planum Sluiter, 1909, Muaras Reef. 

 Didemnum tabulation Sluiter. 1909, Karkaralong Group. 

 Didemnum fragile, Sluiter, 1909, Karkaralong Group. 

 Didemnum rcticulatum Sluiter, 1909, Karkaralong Group. 

 Didemnum maeandrium Sluiter, 1909, Karekelang Island. 

 Leptoclinum multifldum Sluiter, 1909, Muaras Reef. 

 Diploaomoidcs tropicum Sluiter, 1909, Karkaralong Group and Muaras 



Reef. 



DISTRIBUTION OF THE SPECIES IN DEPTH AND GEOGRAPHICAL 



AREA. 



Ascidians were obtained by the Albatross Expedition at 53 stations 

 in the Philippine region and at 3 outside (to the south) of it. The 

 total number of numbered dredging stations of the expedition was 

 57G, but collecting was done also at many ether stations not numbered. 

 Although much dredging in deep and moderately deep water was 

 done by the expedition, it is worthy of note that few ascidians were 

 obtained at greater depths than about 30 fathoms. The eight stations 



