148 PERCY SLADEN TRUST EXPEDITION 



58. Schizoporella spongites (Smitt). 



Hippothoa spongitis, Smitt, Floridan Bryozoa, 1872, p. 42. 

 Cargados, 30 fath. ; Amirante, 30 fath. Large colonies. 



59. Schizoporella viridis, Thornely, in Herdman's Report on Pearl Oyster 

 Fisheries of the Gulf of Manaar, 1905, xxvi, p. 116 ; Waters, Journ. Linn. See. London, 

 ser. 2, Zool., xxxi, p. 147, 1909. 



There are large thick colonies of this species and also thin layers growing on a sea- 

 weed. Young zooecia always have one large avicularium, above the orifice, only. 



Egmont, reef; Providence, 70 fath. ; Coetlvy. 



60. Schizoporella nivea, Busk, Report Challenger Exp., x, pt. xxx, p. 163. 



There are some small colonies corresponding to the description of this form, but that 

 they are loosely adherent instead of entirely free growing, and the lateral processes are 

 replaced by avicularia. 



Amirante, 29 fath.; Seychelles, 39 fath.; Providence, 50 — 78 fath. 



61. Schizoporella biaperta, Michelin. Hincks, Brit. Mar. Pol., 1880, p. 255. 



There are none of the large avicularia borne on mamillte as described by Hincks for 

 his species. The margin of the orifice is thickened below, and a keel-like ridge runs 

 downwards from it. The ooecia have an arched ridge across the front of them. The colony 

 is glistening white. 



Providence, 50 — 78 fath. 



62. Schizoporella circinnata (MacGillivray). 



Lepralia circinnata, MacGillivray, Trans. Roy. Soc. Vict., xix, p. 134; Hincks, 

 Ann. Mag. Nat. Hist., ser. 5, xv, 1885, p. 253. 



The one good colony of this species has its younger zooecia smooth, with a single row 

 of punctures round the margin and those that are older roughened and punctured all over 

 the surface ; ooecia resemble the zooecia. The umbo on these colonies is usually central, 

 below the orifice, but sometimes there are two, which have small rounded avicularia 

 directed outwards. 



Cargados, 30 fath. 



63. Schizoporella ai-mata, Hincks, Brit. Mar. Pol., p. 258. 



There are from 6 — 8 spines on these specimens ; they are much broken but appear to 

 vary from being slender to thick. The species S. scintillans, Hincks*, unless too small, 

 seems to be identical with this species. 



Saya de Malha, 47 fath.; Providence, 125 fath, 



64. Schizoporella lata, MacGillivray, Trans. Roy. Soc. Vict., xix, p. 132 ; MacG., 

 Prod. Zool. Vict. Dec. xiv, p. 145. 



These specimens do not quite correspond with MacGillivray 's description. The sinus 



* Ann. Mag. Nat. Hist., ser. 5, xv, 1885, p. 143. 



