272 " ENDEAVOUR " SCIENTIFIC RESULTS. 



This minute species somewhat resembles S. tenuis, but the 

 hydrothecse are less divergent and not conical, while the 

 gonothecse are of a similar type to those of S. muelleri and 

 S. minima. In regard to the divisions of the internodes 

 there is much variation among the members of the same 

 colony ; in some shoots each pair of hydrothecse occupies 

 a distinct internode, in others some or all of the nodes are 

 obsolete, though the hydrocaulus at these points is con- 

 stricted exactly as when the nodes are distinct ; in other 

 cases again it is quite smooth and unconstricted. 



I have no doubt that the species is identical with the 

 S. minima var. tubatheca of Mulder and Trebilcock, though 

 these observers appear to have seen specimens all of which 

 were divided into regular internodes of the first order. They 

 note the presence of the minute tubular processes, the 

 existence of which in S. minima and >S'. minuta they were the 

 first to point out. I find these appendages in my specimens, 

 but on some only of the internodes, and there is mostly only 

 a single one on an internode, which is situated immediately 

 below the base of one of the hydrothecse. 



According to Mulder and Trebilcock the hydrorhiza may 

 have the linear marginal markings characteristic of S. minima 

 and many other species, or may be simply tubular. 



I collected specimens at Williamstown, Victoria, many 

 years ago, and have seen no others except a fragment or two 

 among the " Endeavour " material. Gronothecse were present 

 on the Williamstown specimens. 



Loc. — Off Devonport and Launceston, Tasmania. 



Sertularia loculosa. Bale. 



Sertularia loculosa, Bale, Cat. Austr. Hydr. Zooph., 1884, 

 p. 91 (part), pi. iv., figs. 5-6, pi. xix., fig. 9 ; Id., Bale, 

 Proc. Roy. Soc. Vict., (n.s.), xxvi., 1913, p. 121, pi. 

 xii., figs. 7-8. Id., Warren, Ann. Natal Govt. Mus., i., 

 1908, p. 306, fig. 8, pi. xlviii., fig. 37. 



Sertularia turbinata, Billard, Ann. Sci. Nat., Zool., (9), xi., 

 1910, p. 19 (in part). 



? Sertularia turbinata, Ritchie, Proc. Zool. Soc, 1910, p. 821. 



^ot Sertularia loculosa. Busk, Voy. " Rattlesnake," i., 1852, 

 p. 393. Id., Bale, Cat. Austr. Hydr. Zooph., 1884, p. 

 91 (part), pi. ix., fig. 12. Id., Jaderholm, Ark. for 

 Zool., i., 1903, p. 285. 



Not Dynamena turbinata, Lamouroux, Hist. Polyp. Cor. 

 Flex., 1816, p. 180. 



