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been observed at Atjeh; Syu. Jmlulensis Cout., finally, has been recorded from the Red Sea, 

 the Indian Ocean and the Pacific as far as the american coast and will therefore certainly 

 once prove to occur also in the East Indian Archipelago. We may consequently also include 

 these five species and this variety in the Fauna of the Indian Archipelago and we come 

 then to the conclusion that two thirds of all the Indopacific species and two 

 thirds of all the Indopacific varieties, that are known at present, are 

 inhabitants of the East Indian Archipelago. 



F"ourteen species and five varieties are at present only known from the Indian Ocean 

 and, generally speaking, from the seas situated westward from the Archipelago. They are 

 the following : 



Syn. fossoi- (Paulson) 



Syn. mcrospiniger Cout. 



Syn. oiiosus Cout. 



Syn. paraneoincris Cout. 



Syn. physocheles Cout. 



Syn. triojiyx Cout. 



Syn. triunguicttlahts (Paulson) 



Syn. Mushaensis Cout. 



Syn. Patilsoni Nob. 



Syn. tricuspidatus (Heller) 



Syn. laticeps Cout. 

 Syn. lophodactyhis Cout. 

 Syn. pachynieris Cout. 

 Syn. Sladeni Cout. 



Syn. Slmipsonii de Man var. Maldivensis Cout. 

 Syji. Pmihoni Nob. var. Kjirrachecnsis Cout. 

 Syn. Patilsoni Nob. var. liminaris Cout. 

 Syn. Patilsoni Nob. var. Rameswarensis Cout. 

 Syn. biungtiiculattis (Stimps.) Cout. var. exi- 

 lipes Cout. 



These 14 species and 5 varieties that hitherto have only been observed in the Red Sea 

 and the northwestern parts of the Indian Ocean, are probably confined to these seas though 

 the possibility of their existing also in the Indian Archipelago is, of course, not excluded. 



Syn. Albatrossi Cout. is a species only known from Laysan Island in the northern Pacific 

 and Syn. brachyceros Nob. only from Makatea, while Syn. Bakeri Cout. and Syn. Mac-Ctillochi 

 Cout. are up to the present time only met with on the coast of South Adelaide, the latter, 

 however, also at Port Jackson. Syn. Latastci Cout., finally, inhabits the coast of Chile, but 

 exists perhaps also in the seas of Australia. 



There can be little doubt, however, that new researches, especially in the Pacific and in 

 the seas of Japan and China, will make us acquainted with other species of which we are at 

 present still ignorant. 



When looking over the new species and varieties discovered by the "Siboga", we call in 

 the first place attention to Syn. odontopJioriis, a form of the Coiiiatiilariun group, noteworthy by 

 the prominent tooth with which the immobile finger of the large chela is armed. The 7 species 

 and 3 varieties of which the Contatulartim group is at present composed, are all inhabitants of 

 the East Indian Archipelago, except only Syn. Albatrossi and Syn. Stiinpsonii var. Maldivensis. 

 Among those species of the Neomeris group, in which the dactyli of the three posterior legs 

 are biunguiculate, Syn. Pococki is remarkable just by the form of these dactyli, because the 

 ventral hook is very short, measuring only one-eighth the total length of the dactyli : in the new 

 Syn. locasta, which is represented by numerous specimens, the dactyli have nearly the same form, 



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