32 SYDNEY J. HICKSON AND F. H. GRAVELY. 



Hydrosome. Only a few hytlrocauli of this very small form were found. 

 They are about ' 1 mm. in length by ' 06 mm. in breadth, and arise from a 

 filamentous hydrorhiza. The hydrocauli are much shorter than in Campanulina A. 

 and strongly ringed throughout their length. The hydrothecse are 0'25 mm. in 

 length by 0'15 mm. in diameter and apparently not so flexible as in A. 



Their margins are cleft to form about the same number of opercular flaps. 



There are about fifteen tentacles, 0'08 mm. in length. 



Gonosonit 1 . Unknown. 



LIST OF BOOKS AND MEMOIRS QUOTED IN THE TEXT. 



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2. ALLMAN, G. J. Monograph of Gymnoblastic Hydroids, pt. ii. (1*72). 



3. ALLMAX, G. J. Hyclroida 'Challenger' Reports, xxiii. (18*8). 



4. BALE, W. M. Catalogue of Australian Hydroid Zoophytes (18*4). 



5. BONNEVIE, K. Zeitschr. wiss. Zool., Ixiii. (1898). 



6. BONNEVIE, K. Hydroida, Norske Nordhavs-Expedition, xxvi. (1899). 



7. BOXNEVIE, K. Bergens Mus. Aarbog, No. 5, 1898, Bergen (1899). 



8. CLARK. Trans. Conn. Acad. iii. (187(1). 



9. HAIITLAUB, C. Hydroiden, Voyage clu ' Belgica ' (1904). 



10. HARTLAUB, C. Zool. Jahrb. Supplement-Bd., vi. (1905). 



1 1. HINCKS, T. British Hydroid Zoophytes (18G8). 



12. HODGSON, T. V. Preliminary Report of the Biological Collections of the 'Discovery,' Geographical 



Journal, April, 1905. 



13. JADERHOLM, E. Arch. Zool. Exper. (4) III. (1904), pp. i.-xiv. 



14. LINNAEUS, C. Syst. Nat. x. (1758). 



15. MARK, E. L. Bull. Mus. Comp. Zool., xxxii., No. 8 (1898). 



16. MARK, E. L. Zool. Anz. Bd. xxii., No. 590 (1899). 



17. MOTZ-KOSSOWSKA, S. Arch. Zool. Exper. Ser. 4. iii. (1905). 



18. NUTTING, C. C. American Hydroids, pt. 1 (1900). 



19. NUTTING, C. C. American Hydroids. pt. 2 (1904). 



20. NUTTING, C. C. U.S. Fish Commission Bull., xxiii., pt. 3, Washington (1905). 



21. SARS, M. Fauna Littoralis Norvegieaa. pt. 3 (1877). 



22. SPENCER, W. B. Trans. Roy. Soc. Victoria (1890). 



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24. ToiiiiEY, H. B. University of California Pub., i. (1902). 



