A. CIRRIPEDIA PEDUNCULATA 



Genus Lepas Linnaeus 



Of the species forming this genus six were already known to Darwin 1 (185 1) and two 

 only have been added since the appearance of the "Monograph": one (Lepas testudinata) by 

 Aurivillius - in 1892 and one (Lepas denticulata) by Gruvel 3 in 1901. 



Most of the species of this genus have "enormous ranges", as Darwin (1. c.) remarked, 

 yet the number of species hitherto observed with certainty in the East Indian Archipelago 

 amounts to only four, viz. 



Lepas anatifera Linn. Philippine Archipelago, according to Darwin. 



Lepas anserifera Linn. East Indian Archipelago (Darwin); Java Sea, Moluccan SeaCChallenger"); 



Sumatra, Ambon, Ternate etc. (Weltner). 

 Lepas fascicularis Ellis & Solander. East Indian Archipelago, off Borneo and Celebes (Darwin). 

 Lepas denticulata A. Gruvel. Honda Bay (Philippines). 



{Lepas Hilli (Leach) which was collected by A. Menzies in the "South Seas" and 

 was found at Port Stephen, Australia (Darwin), Lepas pectinata Spengler, which, according to 

 Darwin, is common under the tropics and Lepas australis Darwin, which Darwin believed to 

 be confmed to the Southern Ocean, have not hitherto been observed in the East Indian 

 Archipelago ; nor has Lepas testudinata Aurivillius, known only from the neighbourhood of the 

 Cape of Good Hope). 



All the species of this genus live attached to floating objects and therefore seem to be 

 inhabitants only of the surface-layers of the sea. 



The specimens of the genus Lepas collected by H. M. S. "Siboga" belong to two species 

 only : L. anserifera Linn. and L. fascicularis Ellis and Solander. 



1 Darwin, C, A monogvaph of the sub-class Cirripedia. The Lepadidae or Pedunculated Cirripedes. London, 1851. 



2 Aurivillius, C. W., Neue Cirripeden aus dem Atlantischen, Indischen und Stillen Ocean. Öfversigt af K. Svensk. Vet. 

 Akad. Förli. 1892, N° 3. 



3 Gruvel, A., Étude d'une espèce nouvelle de Lépadides. Trans. Linn. Soc. (2), VIII, 5, 1901. 



SIEOGA-EXPEDITIE XXXI a. 



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