842 " THETIS " SCIENTIFIC RESULTS. 



proportion is generally over a half, and almost as much as two- 

 thirds may be adnate. In these specimens, also, the three hydro- 

 thecal teeth are less prominent than in Bale's figure of the 

 typical examples. 



None of the characteristic gonangia were present, but in spite 

 of this, and of tlie divergences from tj'pical specimens, which I 

 have noted above, I do not hesitate to regard these as belonging 

 to a form of Sertularella longitheca. 



The following measurements show that the hydiothecae are 

 much larger than those of the typical form ; the whole growth is 

 coirser, and to this is due the varietal name robusta. 



Dimensions. — 



Internode, length 0*75-094 mm. 



„ diameter 0-22-029 „ 



Hydrotheca, length adnate 057-0"66 ,, 



„ „ free 0-38-0-43 „ 



,, diameter at mouth ... 028-0*32 ,, 



Localities. — Station 36, off Botany Bay, one mile from shore ; 

 23 to 20 fathoms ; bottom, sand to rock; 11th March, 1898; a 

 few small colonies. A single small fragment was observed inter- 

 twined with Polyzoa colonies from Station 44, off Coogee, five 

 to six miles from shore ; depth, 49 to 50 fathoms ; bottom, fine 

 sand; 15tli March, 1898. St-ition 48, off Wollongong, seven to 

 eight miles from shore ; depth, 55 to 56 fathoms ; bottom, sand 

 and mud to rock; 18th March, 1898; several colonies growing 

 on submerged debris. 



'^Type Specimens of variety. — In the Australian Museum, 

 Sydney. 



SERTULARELLA TURGIDA(rras;fc)?. 



(Plate Ixxxviii., fig. 6.) 



Sertularia turgida, Trask, Proc. Calif. Acad. Sci., i., 1854-57, 

 p. 113, pi. iv., fig. 1. 



Sertularella turgida, Clarke, Trans. Conn. Acad., iii., 1876, p. 259, 

 pi. xxxviii., figs. 4, 5. Id., Hartlaub, Abb. Nat. Ver. Ham- 

 burg, xvi., 1900, p. 67, pi. 2, fig. 30, pi. 3, figs. 21, 22, text- 

 figs. Id., Torrey, Univ. California Publ., Zool., i., 1902, 

 p. 64, pi. 7, figs. 59-62, pi. 8, figs. 63-69. Id., Nutting, 

 American Hydroids, Part ii. The Sertularidse, S[)ec. Bull 

 U.S. Nat. Mus., 1904, )). 95, pi. 22, figs. 2-5. Id., Torrey, 

 Univ. California Publ., Zool., ii., 1904, p. 29, figs. 22, 23. 



Sertularella conica, Calkins, Proc. Boston Soc. Nat. Hist., xxviii., 

 1899, p. 359, pi. 4, fig. 22. 



