HYDROIDA. BALE. 269 



Two pinnate forms belonging to the same section are 

 S. unguiculata and S. geminata. 



S. operculata is the type of Levinsen's proposed genus 

 Odontotheca, as of Agassiz' earlier Amphisbetia, and with it, 

 on account of the opercular characters, Levinsen has asso- 

 ciated S. macrocarpa and S. maplestonei. The two latter are 

 pinnate species, while S. operculata, with its allies S. bispinosa 

 and S. trispinosa, and perhaps one or two others, form a 

 sub-group distinguished from the other species by the peculiar 

 ramification. 



S. elongata, in which the hydrothecse have six marginal 

 teeth and no operculum, belongs to the proposed new genus 

 Levinsenia. 



SERTULARIA MINIMA, Thompson. 



Sertularia minima, Thompson, Ann. Mag. Nat. Hist., (5), 

 iii., 1879, p. 104, pi. xvii., fig. 3-3b. Id., Bale, Cat, 

 Austr. Hydr. Zooph., 1884, p. 89, pi. iv., figs. 9-10, 

 pi. xix., figs. 12-13 ; Id., Bale, Trans, and Proc. Roy. 

 Soc. Viet., xxiii., 1886, p. 109. Id., Allman, Jourri. 

 Linn. Soc., Zool., xix., 1885, p. 138, pi. xiii., figs. 3-4. 

 Id., Marktanner-Turneretscher, Ann. K. K. Hofmus. 

 Wien, v., 1890, p. 231. Id., Whitelegge in Etheridge, 

 Mem. Aust . Mus., ii., 1889, p. 41. Id., Farquhar, 

 Trans. N.Z. Inst., xxviii., 1896, p. 462. Id., Hilgendorf, 

 Trans. N.Z. Inst., xxx., 1897, p. 209, pi. xx., fig. 1, la. 

 Id., Jaderholm, Schwed. Siidpolarexp., v., 1905, p. 

 24, pi. ix., figs. 4-5. Id., Thornely, Journ. Linn. Soc., 

 Zool., xxxi., 1908, p. 83. Id., Billard, C. R. Acad. Sci., 

 cxlviii., 1909, p. 194 ; Id., Billard, Ann. Sci. Nat., 

 Zool., (9), xi., 1910, p. 17. Id., Jaderholm, Ark. for 

 Zool., vi., 1910, p. 3, pi. i., fig. 2. Id., Ritchie, Mem. 

 Austr. Mus., iv., 16, 1911, p. 845. Id. Mulder and 

 Trebilcock, Geelong Nat., (2), vi., 1914, p. 39, 

 pi. iv., figs. 2-3a, 5-6. 



Synthecium gracilis, Coughtrey, Trans. N.Z. Inst., vii., 1874, 

 p. 286, pi. xx., figs. 26-31. 



Sertularia pumila, Coughtrey, Trans. N.Z. Inst., viii., 1875, 

 p. 301 ; Id., Coughtrey, Ann. Mag. Nat. Hist., (4), 

 xvii., 1876, p. 29. 



Sertularia pumiloides, Bale, Journ. Micro. Soc. Viet., ii., 1881, 

 pp. 21, 45, pi. xii., fig. 2. 



Odontotheca minima, Levinsen, Vidensk. Medd. fra den 

 naturh. Foren, 64, 1913, p. 308. 



