Of these 34 species only 1 1 have hitherto been moreover observed in the seas west of 

 the Indian Archipelago, in the Indian Ocean, the Persian Gulf, the Red Sea etc. They are 

 the following : 



A. paradentipes Cout. 

 A. paralcyone Cout. 

 A. paractileipes Cout. 

 A. microstylus (Sp. Bate). 

 A. rapax Fabr. 

 A. barbatns Cout. 



A. niacrosceles Ale. & Anders. 

 A. crassimantLs Heller. 

 A. pareuchirus Cout. 

 A. Hippo t hoe de Man. 

 } A. eucJiirus Dana. 



Four other "Siboga" species have moreover only been observed in the Pacific, viz: 



A. actdo-femorabis Dana. 

 A. malleodigihis (Sp. Bate). 



A. edamensis de Man. 

 A. leviusailus Dana. 



Of the 4 remaining species A. bidens (Oliv.) has, as far as I am aware, not yet been 

 observed outside the Indian Archipelago; A. chiragricus H. M.-Edw. is also known with 

 certainty from Hongkong and from the Mergui Archipelago, while A. Euphrosyne de Man and 

 A. microrhync/ms de Man occur also in the Gulf of Siam (Bangkok). 



The indopacific species which have not been collected by this expedition, amount to 70 

 besides one unnamed form belonging to the Megacheles group, 9 varieties also have not been 

 obtained. Of these 70 species A. architectus de Man occurs at Atjeh, A. Ehlersi de Man in 

 the Bay of Batavia and A. funafutensis Borr. either also in the Bay of Batavia or off Amboina, 

 while the new variety angustidigitzLs of A. brevirostris (Oliv.) was taken at Balikpapan, East 

 coast of Borneo: these four must therefore be included in the Fauna of the Archipelago. The 

 following 8 or 9 ought very probably also to be added to that Fauna, viz. : 



A. Sairati Cout. 

 A. villos7is (Oliv.). 

 A. paragracilis Cout. 

 A. aglaopheniae Borr. 

 A. crinifus Dana. 



A. cristatiis Cout. 



A. Ill it is Dana. 



} A. distinguendtis de Man. 



A. inacrodactyhis Ortm. 



Of these species, namely, 2 viz. A. Seurati and A. paragracilis have been observed both 

 in the Indian and in the Pacific Oceans, A. aglaopheniae occurs at the south-eastern extremity 

 of British New Guinea, A. cristaUcs at Thursday Island, A. villosus^ besides at the island of 

 Reunion, also on the north coast of Australia and on the coast of British New Guinea, 

 A. crinihis and A. niitis inhabit the Strait of Balabac, while A. inacrodactyhis^ observed as well 

 at Sydney as on the coast of Annam, certainly once will prove to occur in the Archipelago. 

 As regards the Japanese A. distingtiendtis, it is still doubtful whether this form also occurs 

 in the river near Pare-Pare, Celebes, or not. Of the 70 species and the 9 varieties not obtained 

 by this expedition, 42 resp. 6 have up to the present time only been observed in the seas west 

 of the Archipelago, in the Indian Ocean, the Persian Gulf and the Red Sea. These species are 



the following : 



168 



