124 If. M. Bale: 



Billard has associated under the name of S. turhinata not only 

 the two simple forms referred to above, but also the pinnate form 

 described by Kirchenpaiier as Bynamena marginata, and also known 

 as S. inflafa (Versluys), and by other names. This will be further 

 referred to under S. mnrr/'nnta. 



Sertulakia turrinata (LMuiouroux). (Plate XIL, Fig. 6.) 



])i/nainena i ur}>iiuUa , Lamouroux, Hist. Polyji. Cor. Flex.. 



1816, p. 180; id., Encycl. Meth. ii.. 1824. p. 290. 

 Sertularia turhinata, Lamarck, An. s. Vert.. 2nd Ed. ii.. 

 1836, p. 154; Bale, Aust. Hyd. Zooph.. 1884, p. 96; 

 Billard, C. R. Acad. d. Sci.. cxlviii.. 1909, p. 1064; 

 id.. Ann Sci. Xat. (9 .<er.), ix.. 1909. p. :522 (in part); 

 Id. (9 ser.). xi.. 1910. p. 19 (in part). 

 Serf iilaria loriilosa. Busk, Voy. of Rattlesn. i.. 1852, p. 

 .•593; Bale, Aust. Hydr. Zooph., 1884. p. 91 (part), pi. 

 ix.. fig. 12; Jaderholm, Ark. f. Zool.. k. svenska Veten- 

 skapsaka<l. i., 190.3, p. 285. 

 Not Sertularia tarulo.^a Bale. Vide p. 121. 

 Hydrocaulus about half an inch in height, often continued into 

 a stolon, unbranched. Internodes mostly a little longer than the 

 width across the hydrothecae, the proximal one shorter, one or two 

 at the summit often much elongated ; nodes transverse, mostly 

 immediately above the hydrothecae. 



Hydrothecae opposite, a j^air on each internode. in contait in 

 front for a considerable part of their length, separated behind; 

 upper portion divergent almost horizontally, a distinct horizontal 

 fold or ridge crossing them about the middle ; the thickened 

 vertical ridge marking their union in front often continued doAvn- 

 Avard beyond the bases of the hydrothecae; aperture looking outwards 

 and somewhat dowuAvards. with two very indistinct lateral lobes. 



Gonothecae not compressed, with five or six strong annular ridges, 

 summit with a Avide operculate opening; borne on the hnver jiart 

 of the shoots or on the hydrorhiza. 

 Colour, bi-oAvn. often very dark. 



//aft.— Bass- Strait, 45 fathoms (Busk) : Java Sea (Jaderholm) : 

 Paumben. India (?) (Jadei-holm). 



The characters which distinguish this — the original tyjie of ,S'. 

 li>ruh)s<i. Busk — from the short-celled form hithei'to associated with 

 it have been detailed under S. lociilosa, and will lie obvious on 

 reference to the figures. 



