138 CEYLON FfiARL OYSTER REPORT. 



Professor Herdman informs me that some species of Balanus are of real economic 

 importance in competing for food with the pearl oyster in the Gulf of Manaar. 



Barnacles known from Ceylon. 



LEPADID^E. DISTRIBUTION. 



1. Lepas anserifera, L Cosmopolitan. 



*2. anatifera, L 



3. ,, tenuivalvata (Annand.) .... Ceylon. 



4. Dichflaspis equina, Lanch East coast of India, Maldives, Ceylon, Burma, Malaya. 



5. ,, pelhicida, Darw East coast of India, Ceylon, Burma. 



6. Pcecilasma lecempferi, Darw Gulf of Manaar, Malaysia, Japan, Madeira. 



7. Scal/pellum gruvelii, Annand Gulf of Manaar, Laecadives, Andaman Sea (859 to 1022 



fathoms.) 



8. ,, alcocManum, Annand. . . Gulf of Manaar, Andaman Sea (859 to 960 fathoms). 



9. ja/pomcwm, HOEK .... Gulf of Manaar (595 to 556 fathoms); Japan (565 fathoms). 



10. ,, sguamuliferum, Welt. . . . Deeper Indian seas (112 to 1840 fathoms); Japan. 



? tnmcatum, IIoek .... Between New Guinea and Australia (1400 fathoms); 



(?) Gulf of Manaar (590 fathoms). 



11. tenue, Hoek South of Indian Ocean (1375 fathoms); Gulf of Manaar 



(595 to 556 fathoms); Bay of Bengal (199 fathoms). 



12. subflamm, Annand. . . . Gulf of Manaar, Gulf of Oman, Andaman Sea, west coast 



of India (130 to 700 fathoms). 



BALANID^E. 



13. Chelonobia tesludinaria (L.) Gulf of Manaar, warm and temperate seas. 



1 4. Creusia spinulosa, Leach Ceylon, Indian Ocean and Central Pacific, West Indies 



*15. Pyrgonia conjugatum, Darw Red Sea, Ceylon, Mergui. 



*16. Tctraclita serrata, Darw South Africa, Ceylon. 



*17. Acasta cyathus, Darw Ceylon, South America, Australia, Madeira. 



*18. ,, funiadorum, n. sp Ceylon. 



*19. Balanus tintimudndum (L.) Cosmopolitan. 



*20. amphitrite, Darw Warm and temperate seas. 



*21. amaryllis, Darw Indian Ocean and Central Pacific. 



*22. ,, allium, Darw Red Sea, Ceylon, Western Australia. 



*23. terebratus, Darw Maldives, Ceylon. 



*24. ceneas, Lanch Malaya, t Ceylon. 



25. ,, maldirensis, Borr Maldives, Ceylon. 



J 26. Chthainalus stellatus (Poli) Warm and temperate seas. 



t It is convenient to confine the term " Malaya" to the Malay Peninsula, south of the Isthmus of Kra, 

 and the small adjacent islands, such as Singapore and Penang, giving "Malaysia" a wider significance, to 

 include the great archipelago. 



| In addition to the above-mentioned species, I have lately examined specimens of a variety of 

 Conchoderma hunteri, Owen, taken by Mr. E. E. Green on a sea-snake (Hydrus platurus) from Ceylonese 

 waters. Their valves are of typical form, but very small and feebly calcified. The relative length of the 

 peduncle varies considerably. The integument is transparent and almost colourless ; but faint vertical 

 bars can be detected on it in certain lights. April 30, 1906. 



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