HYDROZOA — RITCHIE. 845' 



SERTULARIA ELONGATA, Lamouroux. 



Sertularia elongata, Lamouroux, Hist. Polyp. Corral, flexibles,. 

 1816, p. 189, pi. v., tigs. 3«, B, C. Id., Bale, Cat. Austr. 

 Hydroid Zoophybe.<!, 1884, p. 75, pi. vi., figs, 7, 8., pi. xix., 

 fig. 7. Id., Billard, Ann. Sci. Nat., (9), vi., 1907, p. 217,. 

 fig. 2. 



Sertularia millefolium, Lamarck, Hist. nat. Anim. sans Vertfe- 



bres, 1816, p. 116. 

 Sertularia lycopodiuni, Lamarck, Ibid., p. 117. 

 Sertularia scandens, Lamouroux, Op. cit., p. 189. 



Dynamene ahietiuoides, Gray in Dieffenbach, Travels in New 

 Zealand, 1843, ii., p. 294. 



Sertularia ahietiuoides, Coughtrey, Trans. N. Zeal. Inst., vii., 

 1875, p. 285, pi. XX., figs. 16, 18-20. 



Station 40. 



Recorders agree in ascribing a wide range of variability to 

 this characteristically Australian species. The present specimens, 

 colonies 4 to 5 cms. long, with pinnse averaging about 5 mm., are' 

 notable for the robustness of their minute structures — the 

 strength of the hydrothecal teeth, and the great thickness of the 

 hydrothecal walls in the free adcauline portion, being especially 

 noticeable. Yet the hydrothecse are much smaller in size than 

 the average. 



Dimeusions. — 



Stem, length of internode 0"68-0*73 mm. 



Hydrotheca, length of external profile 0'25-0"29 ,, 



,, ,, ,, adnate portion .., 0"21-O-32 ,, 



,, diameter 0'11-014 ,, 



,, thickness of abcauline wall 15-21/1. 



,, ,, ,, free adcauline wall ... 15-21/i. 



Gongium, length up to 2 mm. 



,, maximum diameter 0'77-0*99 mm. 



Locality. — A small clump of colonies from Station 40, oflf Wata 

 Mooli, three miles from shore; depth, 52 fathoms ; bottom, sand 

 and boulders ; 12th March, 1898. 



SERTULARIA MINIMA, Thompson. 



Synthecium gracilis, Coughtrey, Trans. N.Z. Inst., vii., 1875,- 

 p. 186, pi. XX., figs. 26-31 (name preoccupied). 



Sertularia pumila, Coughtrey, Trana, N.Z. Inst., viii., 1876,- 

 p 301, and Ann. Mag. Nat. Hist., (4), xvii., 1876, p. 29. 



