THORNELY— MARINE POLYZOA OF THE INDIAN OCEAN 145 



the ridge below the uppermost furrow rather more raised than the rest, forming a screen 

 below the orifice. Orifice with two spines near together, above, which bend forward, and 

 two lateral broader spines which unite in the centre, making an arch over the orifice. Ooecia 

 small, rounded and smooth. 



Providence, 50 — 78 fath. 



There is only one small colony of this species, growing with many other species on a 

 small bit of coral. It is smaller and more delicate than C annulata. 



38. Steganoporella magnilahris (Busk). 

 Memhranipora magnilahris Busk, Brit. Mus. Cat., ii., p. 62. 

 Amirante, 20 — 25 fath. 



39. Thalamoporella rozieri, Aud. 



Steganoporella rozieri, Hincks, Ann. Mag. Nat. Hist., ser. 5, vi, 1880, p. 379. 



Some colonies are growing in the form of hollow tubes, one is incrusting a stick and 

 one a coral. They have the ooecia of Hincks' form indica and the avicularia both of that 

 form and of form falcifera. 



Amirante, 20 — 35 fath. ; Farquhar atoll ; Cargados, 30 fath. ; Coin, Pei-os. 



40. Bifaxaria vagans, n. sp. (PI. 8, fig. 7). 



Zoarium erect, calcareous, of a dull brown colour, with lighter coloured tips, forking at 

 irregular intervals ; branches not all in one plane, with corneous joints near their bases. 

 Zocecia elongate, perforated, distinctly divided from each other. Orifice v^itli raised peri- 

 stome enclosing a small pointed avicularium, which is directed upwards fi'om a central 

 position and leaves a sinus in the margin when absent. There are no ooecia. 



Seychelles, 34—39 fath. ; Amirante, 34 fath. 



There is a good quantity of this species, which has the appearance of a sertularian 

 hydroid to the naked eye. It is placed provisionally under the genus Bifaxaria, being 

 closely allied to B. reticulata. 



41. Salicornaria tenuirostris, Busk, Brit. Mus. Cat., i, p. 17. 



These specimens are about 2 inches in height, their avicularia are not so attenuated 

 as in Smitt's* figvu-e and in some colonies are very much shorter than in others, where 

 the mandible is almost triangular, leaning forward. There are several colonies in the 

 collection. 



Seychelles, 39 fath. ; Amirante, 32 fath. ; Cargados, 28 — 30 fath. ; Providence, 

 50 fath. 



42. Tubucellaria cereoides (EUis and Solander). MacGillivray, Prod. Zool. Vict. 

 Dec. ii, p. 18. 



Cargados, 28 fath. ; Saya de Malha, 29 — 145 fath. 



* Floridan Bryozoa, p. 4, PI. I, tig. 57. , 



SECOND SERIES— ZOOLOGY, VOL. XV. 19 



