Hydrozoa and Pohjzoa from the China Sea. 19 



to 1"5 mm. in diameter; front surface of young marginal 

 zooecia with from 4-8 circular stellate pores ; orifice semi- 

 circular with straight lower border, at each end of which is a 

 small avicularium with a small pointed mandible ; in older 

 cells the surface of the zooecium is sunk at the bottom of an 

 oval depression, and one of the lateral avicularia rises on a 

 calcareous stalk to a level with the general surface ; a row of 

 small avicularia present along the margins of the branches, 

 and occasionally at the bases of the zooecia. 



Hab. Tizard Reef, 35 fath. 



The Tizard-Reef specimen closely resembles Stoliczka's 

 figure in Sitz. Ak. Wiss. Wien, Bd. xiv. pi. iii. Hg. 1. Here 

 there is a knob rising from the centre of a dark depression. 



Lepralia lonchcea. Busk. 



Lepralia lonchcea, Busk, Oliall. Rep. p. 146. 



Lepralia vestita, Hincks, Ann. & Mag. Nat. Hist. (5) 1885, xv. p. 256, 

 pi. ix. 



Mr. Waters, in his Supplementary Report on the l Chal- 

 lenger ' Polyzoa (p. 28), remarks that, without a more 

 complete examination, he is unable to decide whether or not 

 these two forms are identical. A plentiful supply of 

 material enables me to state that the two species are syno- 

 nymous. The opercula vary slightly in appeararce, according 

 to the mode of preparation ; but the same variations (in 

 appearance only) were obtained both in specimens from the 

 Tizard Bank and from the ' Challenger ' collection. Further, 

 Mr. Hincks's description applies in every detail to the 

 specimens from the China Sea. 



Hab. Tizard Reef, 27 fath. 



Lepralia foraminigera, Hincks, var. 



Lepralia foraminigera, Hincks, Ann. & Mag. Nat. Hist. (5) 1883, xi. 

 p. 200, pi. vii. tig. 1. 



Hab. Incrusting coral, Tizard Reef, 35 fath. 



The variation consists in the presence of a peristome 

 laterally and behind the mouth, and of an avicularium shaped 

 like the spout of a jug, with a long narrow acute mandible, 

 on the front wall of the cell. 



Lepralia quadrata. Busk. (PI. V. figs. 2, 2 b.) 

 Mucronella quadrata, Busk, Chall. Rep. p. 156, pi. xvii. 



This species is removed from the genus Mucronella because 



2* 



