i5i 



(June 1912) 10 more species were added to the list, viz. 1 by Borradaile 1 (B. maldivensis, 

 1903), 1 by Gruvel 3 (B. carenatus, 1907), 1 by Krüger s (B. poecilotheca, 191 1) and 7 by 

 Pilsbry 4 (B. aquila, B. Evermanni, B. fios and B. orcutti 1907; B. penivianus, 1909; 

 B. callistoderma and B. hoekianus, 191 1 ). The number of living species known and described 

 at present would thus amount to 59. It is proposed in the present report, to include in a 

 new o-enus 4 of the species which hitherto were considered to belong to the genus Balanus: 

 2 of Hoek's species of 1SS3 [B. corolliforiuis and B. hirsutus) and 2 of Pilsbry's species 

 of 191 1 (B. callistodcmia and B. hockianus). The number of species of Bal anus would 

 therefore be reduced to 55. But, since I have now to propose for this genus 16 new species, 

 the total number of known species would at present amount to 71. 



According to his Mönograph, Darwin (1854) knew 9 species of Balanus, as occurring 

 in the Malay Archipelago. The Challenger (1883) collected in this region two new species of 

 this genus, so that in all 1 1 species were known from it. The dredgings carried out during the 

 cruise of the Siboga produced specimens of 26 species of the genus Balanus. Of these 16 

 must be considered — as I have already said — as new to science; of the remaining 10, 

 6 have already been observed in that region, while 4, although known species, are stated 

 for the first time here to occur in the said region : the total number of species known to 

 occur there would thus amount to 31. 



I here give a complete list of the species of Balanus hitherto collected in the 6 th province 

 which I proposed for the distribution of the Cirripedia, and which includes the Malay Archipelago 

 and the eastern coasts of India. The names are given in alphabetical order. Those with an 

 asterisk are species which, according to Darwin, are found in this region, but which are not 

 represented in the Siboga-collections. Those with a f are species already known for other regions, 

 but which were collected in the Malay Archipelago by the Siboga for the first time. 



*B. ajax Darwin . . . 

 B. alatus n. spec. . . 

 B. albus n. spec. . . 

 B. amaryllis Darwin 



B. amphitritc Darwin 



B. arcaatus n. spec. 

 B. auricoma n. spec. 



Philippine Archipelago, attached to Milleporae. 



Sulu Sea: Stat. 97. 



BaliSea: Stat. 12; Kei Islands: Stat. 260; (PSuluSea: Stat. 95) 



Different places: Stat. 50, 258, Jedan Islands. Also India: 



Mouth of the Indus, Moreton Bay and N. E. coast 



of Australia. 

 Several places throughout the Archipelago. Extremely 

 common outside the Archipelago, e. g. Mouth of the 



Indus, Ceylon, Australia, etc. 

 Banda. 

 Ternate: Stat. 136; (? Kei Islands: Stat. 260). 



Shallow water. 



564 m. 



90, 289 (? and 522 m.) 



13—40 m. 



O — 56 m. 



9— 36 m. 

 27 (and ? 90 m.). 



1 Borradaile, L. A., Marine Crustaceans (of the Maldive and Laccadive Archipelagoes). The Fauna and Geography of the 

 Mald. and Lacc. Archipel. Part. IV — VII. VII. The Barnacles. 1903. 



- Gruvel, A., Cirrhipèdes operculés de I'Indian Muséum de Calcutta. Mem. Asiatic Soc. Bengal. II. 1907. p. 1 — 10. 2 pi. 



:l Krüger, Paul, Beitrage zur Cirripedienfauna Ostasiens. Abhandl. d. math.-pliys. KI. d. Bayer. Akad. d. Wisschensch. II. 

 Suppl. Bd. 6. Abhandl. 191 1. 72 S. 4 Taf. 



i Pilskry, Henry A.. Cirripedia from the Pacific coast of North America. Bulletin of the Bureau of Fisheries. Washington. 



XXVI. 1907. 



1 Report on Barnacles of Peru, collected by R. S. Coker and Others. Proceed. U.S. Nat. Museum. XXXVII. 1909. 12 p. 4 pi. 



Barnacles of Japan and Bering Sea. Bulletin of the Bureau of Fisheries. Washington. XXIX. (1909). 26 p. 10 pi. 1911. 



2 3 



