HYDROZOA — RITCHIE. 855 



Kirchenpatieria mirabilis, Bale, Proc. Roy. Soc. Vict, (n.s.), vi,, 

 1894, p. 109, pi. vi., figs. 4-7. Id., Warren, Ann. Natal 

 Govt. Mus., i., 1908, p. 321, fig. 15, p. 323. 



Plumularia mirabilis, Billard, Ann. Sci. Nat. (n.s.), xi., 1910, 

 p. 37. 



Station 44. 



Only a minute fragment of a colony represents this species. 

 The structural details appear to fall between those of typical 

 Diplocheilus mirabilis and Diplocheilus productus (Bale). With 

 the latter it agrees, especially in the narrowness of the intra- 

 thecal ridge at the point where it joins the anterior wall, but 

 this is a variable character ; while the widely expanded margin 

 of the hydrotheca shows resemblance to the former. There are 

 generally two hydroclades on each internode, each accompanied 

 by two close-set sarcothecse, one in the axial above the stem- 

 process on which the hydroclade is borne, the other at the 

 superior interior border of the process. The only other cauline 

 sarcotheca, the position of which approaches constancy, is that 

 which lies close to the distal edge of an internode, in the middle 

 of the antei'ior surface. The nematocysts within the stem are of 

 large size, 15fi long, by 9/x or 10/i in diameter, but the coenosarc, 

 apart from these, has decayed. 



Dimensions. — 



Stem internode, length 0-59-l*19 mm. 



„ ,, diameter 0-15-0'17 „ 



Hydroclade internode, length 0"44-0"50 ,, 



Hydrotheca, depth (highest point to lowest) 0"31-0'33 ,, 



,, diameter of mouth (side view) 0*19-0"21 ,, 



Locality. — Entangled amongst Polyzoa from Station 44, off 

 Coogee, five to six miles from shore ; depth, 49 to 50 fathoms ; 

 bottom, fine sand ; 15th March, 1898, 



The known distribution of this species is confined to Austra- 

 lian waters, and to the Natal coast. — Moncoeur Island, Bass 

 Strait (Allman), Port Phillip and Griffith Point (Bale), and 

 present record ; Scottburgh, Natal (Warren). 



HALICORNOPSIS ELEGANS (Lamarck). 

 (Plate Ixxxix., fig. 1.) 



Plumularia elegans, Lamarck, Histoire nat. des Animaux sans 

 Vertebre.s, 1816, p. 129. 



Aglaophenia elegans, Laraouroux, Hist, polyp, corral, flexibles, 

 1816, p. 169. 



