THORNELY— MARINE POLYZOA OP THE INDIAN OCEAN 151 



between. There is no indication of this form in the operculum. Avicularia on lateral 

 eminences about on a level with the lower margin of the orifice or below it, pointed and 

 directed forwards and downwards. Ooecia fairly large, rounded and with the same surface 

 as the zooecia. 



Amirante, 125 fath. 



78. Lepralia depressa, Busk, Brit. Mus. Cat., ii, p. 75. 



These specimens are roughly calcareous. There is no perceptible difference in the 

 size of the orifice in fertile and non-fertile zooecia. There are from 2 — 4 spines above the 

 orifice on some zooecia. Avicularia are short and pointed, directed upwards, usually, one 

 on either side of the orifice as in Smitt's * species Escharella rostrigera. 



Salomon, 75 fath. 



79. Lepralia bicornis, n. sp. (PL 8, fig. 11). 



Zoarium yellowish grey, incrusting. Zooecium with large orifice situated almost in the 

 centre of its five-sided form, surface thick, opaque white, raised round the orifice, with 

 faintly perceptible lines radiating towards the margin, where there are perforations. 

 Orifice arched above widening downwards with an almost straight lower margin. A small, 

 round avicularium to one side of the orifice or sometimes below it, large spatulate 

 avicularia on separate areas scattered here and there over the zoarium. Ooecia of moderate 

 size, rounded. 



Oargados, 30 fath. ; Salomon, 75 fath. 



The orifice of this species is about the size of that of L. pallasiana, the zooecium is 

 shorter than that species and rounder and not punctured on the surface, and there are 

 numerous avicularia. 



80. Porella concinna var. gracilis, Hincks, Brit. Mar. Pol., p. 324. 

 Providence, 50 — 78 fath. 



81. Porella nitidissima, Hincks, Ann. Mag. Nat. Hist., ser. 5, vi, 1880, p. 78. 

 Amirante, 29 fath.; Saya de Malha, 125 fath. 



82. Smittia signata, Waters, Ann. Mag. Nat. Hist., ser. 6, iv, 1889, p. 17. 

 Saya de Malha, 125 fath. 



83. Smittia landshorovii, Johnston. Hincks, Brit. Mar. Pol., p. 341. 

 Saya de Malha, 125 fath. 



84. Smittia marmorea, Hincks, Brit. Mar. Pol., p. 350. 

 Amirante, 34 fath. 



85. Smittia tuhula, Kirkpatrick, Ann. Mag. Nat. Hist., ser. 6, i, 1888, p. 79. 

 Providence, 50 fath. 



86. Smittia affinis, Hincks, Brit. Mar. Pol., p. 348. 



There is a very little colony with small zooecia, which are smooth with marginal 



• Floridaii Bryozoa, p. 57. 



