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al most confined to deep water, so far as the 'Siboga' dredgings are concerned. Titbulipora 

 atlantica, var. flextiosa was obtained only at Stations 156 and 105, 469 and 275 M. Of the 

 two species of Berenicea, B. lineata was obtained once at Stat. 139, 397 M., but once at only 

 9 — 45 M. (Stat. 240); while B. sarniensis occurred at Stations 105, 204 and 310, (275, 75 — 94 

 and 73 M.). Entalophora proboscidea ranged from 390 M. to some depth less than 32 M., the 

 determination of the deep water specimen being doubtful. The specimens referred to Tubulipora 

 pulcherrima were numerous, and are recorded from 390 M. to the shallowest dredgings; four 

 of the records being, however, from more than 100 M., and three from more than 200 M. 

 Cr is ia elongata and three species of Lichcnopora are each recorded from Stat. 105, 275 M., 

 although all the other occurrences were from less than 95 M. None of the other Cyclostomes 

 found were from depths exceeding 91 M. 



If the determinations made are correct, it thus appears that several of the species range 

 from quite shallow water to depths that can be considered abyssal. But it is not impossible 

 that this apparently wide range may be due to incorrect determinations of the specimens from 

 deep water. 



With regard to the Geographical Distribution of the species in the Archipelago, it may 

 be pointed out that the Stations where Cyclostomes were found are distributed over the whole 

 of the area investigated. The Sulu Sea, which yielded no Entoprocta and only one Ctenostome, 

 has furnished 9 Cyclostomes. Crisina radians was found only at two Stations (37, 315), close 

 together, off the Paternoster Islands; but Crisict elongata and Tubulipora pulcherrima, the 

 species of which the records are most numerous, were widely distributed in the Archipelago. 

 It thus appears that the area investigated by the 'Siboga' cannot be divided into distinct sub- 

 regions, on the evidence of the Cyclostomata, any more than was the case with the Entoprocta 

 or the Ctenostomata. 



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