HYDROZOA — RITCHIE. 813 



worms (or on Cystosira). No gonothecse are present to confirm 

 the identification, but the minute characters of the unfascicled 

 ■and usually simple trophosome agree with those of this species. 

 There is great variation, however, in the dimensions of the inter- 

 nodes, the proportions varying so much that little account ought 

 to be taken of the relation of length to breadth in distinguishing 

 at least this species. The following table of dimensions, as well as 

 the figures on Plate Ixxxvii., illustrate the variation which occurs 

 even in the very scanty material before me. 



Dimensions. — 



Internode, length 015, 0-27, 0-31 , 0-57, 0-59 m.m. 



„ diameter at base 0-14, 0-13, 0-14, 0-15, 0-U „ 



Hydrotheca, diameter 0'14 mm. 



Locality. — On Sabellid worm tubes from Station 54, within 

 Jervis Bay ; depth, 10 to 11 fathoms ; bottom, seaweed and sand. 



Halecium sessile, although widely distributed in the North 

 Atlantic fi'om Europe to the east coast of North America, and 

 from Lofoten in Norway to south of Maderia, has not so far been 

 recorded from without that area. 



Family CAMPANULARID^. 



OAMPANULARIA HINCKSII, Alder, 



var. GRAND IS, Billard. 



Campanularia voluhilis, var., Hincks, Ann. Mag. Nat. Hist. (2), 



xi., 1853, p. 180. 

 {J ampanularia hincksii, Alder, Ann. Mag. Nat. Hist. (2), xviii., 



1856, p. 360, pi. xiii., fig. 9. Id., Hincks, Hist. Brit. 



Hydroid Zoophytes, 1868, p. 162, fig. 18, pi. xxiv., figs. 3, 



3a. /c/., Billard, Exp. Sci. "Travailleur " et "Talisman," 



Hydroides, viii., 1907, p. 172, fig. 4. 

 Catnpanularia hincksii, var. grandis, Billard, Op. eit., p. 172, 



fig. 5. 

 Campanularia hincksi, Jaderholm, Kungl. Svenska Vetens.-Akad. 



Handl., xlv., 1909, p. 67, pi. vi., fig. 11. 



Station 44. 



The few specimens referred to this species di£fer somewhat 

 from the typical forms of British seas. The main differences lie 

 in the greater size of the Australian specimens ; in the absence 

 of longitudinal fluting on the walls of the hydrotheca ; in the 

 weakness or absence of the notch which in typical specimens 



