840 •• THETIS " SCIENTIFIC RESULTS. 



Sertularella divaricata, var. subJichotoma, Bale, Proc. Linu. S< c. 

 N. S. Wales, (2), iii., 1888, p. 761, pi. xvi., Hgs. 3, 4. M, 

 Hartlaub, Abh. Nat. Ver. Hamburg, xvi., 1900, p. 23. 



Station 44. 



A minute fragment, only about 3 cms. long, shows the charac- 

 teristic lax and irregular branching, and the other structural 

 details of Bale's variety. Scarcit}' of material, and the absence 

 of gonangia, alike forbid speculation as to the ])0ssibility of 

 identity between this Australian variety and the South American 

 and Antarctic Sertularella subdichotojna, Kirchenpauer, excel- 

 lently and minutely described and figured by Hartlaub (1900). 



Dimensions. — 



Internode, length 0-43-0-63 mm. 



Hydrotheca, length adnate 0"14-020 ,, 



free 0-11-0-15 „ 



,, diameter at mouth... 0-14-0 16 ,, 



Locality. — Station*44, off Coogee, five to six miles from shore ; 

 depth, 49 to 50 fathoms ; bottom, fine sand ; 15th March, 1898. 



This variety has previously been recorded only from Port 

 Jackson (Bale), and Bass Strait (Kirchenpauer). 



SERTULARELLA LONGITHECA, Bah, typlca. 



(Plate Ixxxviii., fiig. 7.) 



Sertularella longitheca, Bale, Proc. Linn. Soc. N. S, Wales, (2), 

 iii., 1888, ]). 762, pi. xvi., figs. 5, 6. Bale, Trans. Roy. Soc. 

 Vict, (n.s.), vi., 1894, p. 101, p iv., figs. 7-9. Hartlaub, 

 Abh. Nat. Ver. Hamburg, xvi., 1900, p. 21. 



Station 57. 



A few diminutive but typical examples of this species were 

 found at only one Station. They form delicate, straggling, 

 unbranched stems up to 30 mm. in length. Bale's figures are 

 ■characteristic, the most marked features of tlie trophosome of 

 the species being the length of the hydrothecse, associated with 

 their small calibre, regularly tubular shape, and the large pro- 

 portion which is free from the stem. The specimens before me 

 rarely show definite nodes between hydrothecse, and in dis- 

 tinction from the variety following, the stem is straight, showing 

 no signs of geniculation. 



The significant measurements of the trophosome agree fairly 

 closely with calculations made from Bale's figures, except that 

 in the present specimens a larger proportion of the hydrotheca is 

 iree from the stem. Gonosome not present. 



